Re: OrderedMapIterator and LRUMap
Hayden James wrote: Now if I use synchronizedMap, which forces me to use the Map interface like: Map map = Collections.synchronizedMap(new LRUMap()); which iterator from which function do I cast in order to get the same behavior as above? OrderedMapIterator iter = (OrderedMapIterator) map.entrySet().iterator(); or maybe OrderedMapIterator iter = (OrderedMapIterator) map.keySet().iterator(); or perhaps something completely different. The documentation is a little vague on how to accomplish this. Once you wrap the LRUMap in a synchronized map there is no way to obtain the ordered iterator. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Can we optimize HashCodeBuilder.append(Object)?
Hi,
Have you got figures to show what difference the code change makes?
If so, perhaps you could raise a JIRA call so we can process this for
[lang].
thanks
Stephen
Venkatesh Prasad Ranganath wrote:
Hi,
I am using HashCodeBuilder and I found that the use of Class.isArray()
method in append(Object) to be a bottleneck. Following program and
jprof data illustrates the bottleneck along with a solution. I was
curious if we can integrate the solution code in
OptimizedHashCodeBuilder.append(Object) into
HashCodeBuilder.append(Object) in the upcoming version 2.3 release of
Commons Lang.
CPU SAMPLES BEGIN (total = 71) Sat Jun 30 16:51:43 2007
rank self accum count trace method
1 45.07% 45.07% 32 300138 java.lang.Class.isArray
2 14.08% 59.15% 10 300141 java.util.AbstractList.hashCode
3 12.68% 71.83% 9 300142 java.util.AbstractList.hashCode
4 4.23% 76.06% 3 300030
sun.nio.cs.UTF_8$Decoder.decodeArrayLoop 5 4.23% 80.28% 3
300144 java.util.AbstractList.hashCode
6 2.82% 83.10% 2 300143 Test.run2
7 2.82% 85.92% 2 300139 java.util.ArrayList.get
8 1.41% 87.32% 1 300140 java.util.AbstractList.hashCode
9 1.41% 88.73% 1 300145 java.util.AbstractList.hashCode
10 1.41% 90.14% 1 300027 sun.nio.cs.UTF_8$Decoder.init
11 1.41% 91.55% 1 300012 java.nio.DirectByteBuffer.init
12 1.41% 92.96% 1 300089 sun.security.provider.Sun.clinit
13 1.41% 94.37% 1 300132 sun.security.provider.Sun.init
14 1.41% 95.77% 1 300071 java.lang.StringCoding.decode
15 1.41% 97.18% 1 300031
sun.reflect.NativeConstructorAccessorImpl.newInstance 16 1.41%
98.59% 1 300048 java.net.URLClassLoader.defineClass
17 1.41% 100.00% 1 300137
sun.net.www.ParseUtil.canonizeStringCPU SAMPLES END
import org.apache.commons.lang.builder.HashCodeBuilder;
public class Test {
public static void main(String[] s) {
java.util.ArrayList o = new java.util.ArrayList();
o.add(Hello);
o.add(World);
run1(o);
run2(o);
}
static void run1(Object o) {
for (int i = 0; i 1; i++) {
HashCodeBuilder h = new HashCodeBuilder();
for (int k = 0; k 100; k++) {
h = h.append(o);
}
}
}
static void run2(Object o) {
for (int i = 0; i 1; i++) {
HashCodeBuilder h = new OptimizedHashCodeBuilder();
for (int k = 0; k 100; k++) {
h = h.append(o);
}
}
}
}
class OptimizedHashCodeBuilder extends HashCodeBuilder {
public HashCodeBuilder append(final Object object) {
if (object == null) {
super.append(object);
} else {
// 'Switch' on type of array, to dispatch to
the correct handler// This handles multi
dimensional arrays
if (object instanceof long[]) {
append((long[]) object);
} else if (object instanceof int[]) {
append((int[]) object);
} else if (object instanceof short[]) {
append((short[]) object);
} else if (object instanceof char[]) {
append((char[]) object);
} else if (object instanceof byte[]) {
append((byte[]) object);
} else if (object instanceof double[]) {
append((double[]) object);
} else if (object instanceof float[]) {
append((float[]) object);
} else if (object instanceof boolean[]) {
append((boolean[]) object);
} else if (object instanceof Object[]) {
// Not an array of primitives
append((Object[]) object);
} else {
// the simple case, not an array, just
the elementappend(object.hashCode());
}
}
return this;
}
}
Venkatesh Prasad Ranganath
e-id: [EMAIL PROTECTED]
e-id: [EMAIL PROTECTED]
web: http://www.cis.ksu.edu/~rvprasad
blog: http://venkateshthinks.blogspot.com
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Re: Instantiating Utility Classes
I doubt that they will be made non-public, as this reason still applies. If you would like, please raise a JIRA call to get the javadoc clarified further. Stephen - Original Message From: Keith Bennett [EMAIL PROTECTED] Thanks for responding. Is it safe for me to assume that these public constructors will never become deprecated or nonpublic? This is very important to me. Also, would it be possible for someone to amend the Javadoc to say what you just said, so that other people will know it's ok to use it for this purpose? Thanks very much for your work. I've benefited much from it on several projects. - Keith Bennett On 5/30/07, Stephen Colebourne [EMAIL PROTECTED] wrote: Keith Bennett wrote: Recently I started using Velocity and JEXL for expression evaluation so that users can write templates that format the data the way they like. I figured it would be really handy to give them access to StringUtils, WordUtils, DurationFormatUtils, etc. But these templating tools require that you pass an instance into the context and call static methods via that instance reference; one cannot call ClassName.staticMethodName(). Unfortunately, instantiating these utility classes is not recommended. The StringUtils constructor Javadoc at http://jakarta.apache.org/commons/lang/api-release/org/apache/commons/lang/StringUtils.html says StringUtils instances should NOT be constructed in standard programming. The only reason that the constructor is public at all is so it can be used in Velocity. So, go ahead and use it :-) Stephen Of course I could write my own object that delegates to every single method in the respective class, but that seems kind of silly. Is there any reason why it would be a bad idea to support creating instances of the utility classes? I realize that naive programmers use instances when it is better to use classes, but I think I have a legitimate need here. Also, if the class were made final, then the confusion of static methods not following the same rules as nonstatic methods with inheritance could be avoided. How can I find out if there has already been discussion of this, or if not, how can I submit a request? Do you have any suggestions how to deal with this issue? Thanks. - Keith Bennett - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Instantiating Utility Classes
Keith Bennett wrote: Recently I started using Velocity and JEXL for expression evaluation so that users can write templates that format the data the way they like. I figured it would be really handy to give them access to StringUtils, WordUtils, DurationFormatUtils, etc. But these templating tools require that you pass an instance into the context and call static methods via that instance reference; one cannot call ClassName.staticMethodName(). Unfortunately, instantiating these utility classes is not recommended. The StringUtils constructor Javadoc at http://jakarta.apache.org/commons/lang/api-release/org/apache/commons/lang/StringUtils.html says StringUtils instances should NOT be constructed in standard programming. The only reason that the constructor is public at all is so it can be used in Velocity. So, go ahead and use it :-) Stephen Of course I could write my own object that delegates to every single method in the respective class, but that seems kind of silly. Is there any reason why it would be a bad idea to support creating instances of the utility classes? I realize that naive programmers use instances when it is better to use classes, but I think I have a legitimate need here. Also, if the class were made final, then the confusion of static methods not following the same rules as nonstatic methods with inheritance could be avoided. How can I find out if there has already been discussion of this, or if not, how can I submit a request? Do you have any suggestions how to deal with this issue? Thanks. - Keith Bennett - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Closure, Predicate, and Transformer Examples
Its an example of a class you'd write yourself. Although there are
similar methods on commons-collections CollectionUtils.
Stephen
Paolo Viappiani wrote:
In which package is ModelUtils?
p*
On 2/26/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Vishist Mandapaka [EMAIL PROTECTED] wrote:
Hi,
Can anyone guide me with examples for Closure, Predicate, and
Transformer
objects. I am unable to map it to any real world scenarios where these
objects may be of use.
Closure:
I have a tree of Attribute objects, and for each one which has one or
more
attached errors I want to add it to a list. I therefore have a method
that
walks the tree of objects and for each node in the tree invokes a Closure
that is passed in as a parameter:
private List findErrors(AttributeGroup model) {
final List errors = new ArrayList(10);
Closure cb = new Closure() {
public void execute(Object input) {
Attribute attr = (Attribute) input;
List errList = attr.getErrorList();
if ((errList != null) (errList.size() 0)) {
errors.add(attr);
}
}
};
ModelUtils.forEachAttr(model, cb);
return errors;
}
The tree-walking code (ModelUtils.forEachAttr) can then be reused with
Closure objects that do other types of things.
Predicate:
Given a list of Person objects, return only those whose country attribute
has a specific value (filtering).
Transformer:
Given a list of strings, return a list of JSF SelectItem objects that
wrap
those strings, allowing the list to be displayed in a drop-down list in a
JavaServer Faces view. This same Transformer class can then be used to
generate wrappers for a list of colours, a list of countries, etc. Yes a
simple method can be written to do this, but with the Transformer
approach a
Transformer instance can then be passed around as an object without
the code
needing to know exactly *what* the Transformer will do.
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Re: [collections] Tree data structure
I would be happy for an experimental Tree based API being added to the generics branch. It would therefore have to be a generified tree API :-) Stephen Carlos Sanchez wrote: Anyone knows of a tree implementation (not binary)? I read in old threads (2002) somebody willing to contribute one but seems it didn't make it to collections. Is there any interest on having one? Regards - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [IO] writeStringToFile( File, String, String ), when File does not exist
I've raised and fixed this as IO-107. Stephen Stephen Colebourne wrote: Jamie Bisotti wrote: As I mentioned in my original post...The JavaDoc for writeStringToFile() says: Writes a String to a file creating the file if it does not exist. That seems to imply that directories would be created, if need be; however, that is not happening. Is this a bug? Or does the documentation just need to be clarified? It does not say anything about directories having to exist; it says the file will be created if it does not exist. [snip] Is this a bug or an incomplete comment, in need of clarification? It isn't a bug, but a reasonable enhancement. (At the minimum the javadoc should be improved). Please raise a JIRA call. We'd also welcome a fix and test case if you have time. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [lang] Can I create date with jakarta commons
There is no such function at present. Feel free to add a request in JIRA.
Stephen
[EMAIL PROTECTED] wrote:
Good day!
I need sometimes to create concrete Date object. I have the function to do
it now:
public static Date createDate(int year, int month, int day){
Calendar calendar = Calendar.getInstance();
calendar.set(year, month, day, 0, 0, 0);
calendar.set(Calendar.MILLISECOND, 0);
return calendar.getTime();
}
Is there such function in commons?
Thanks!
_
With best regards,
Vitaly Baranovsky
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Re: [io] new ThresholdingOutputStream implementation
Sounds interesting. Can you raise a JIRA call for this (enhancement) and
attach the changes to it? That way we won't lose it. Thanks
Stephen
Michele Mazzucco wrote:
Hi all,
I've extended the ThresholdingOutputStream class with a new class which
behaves different from DeferredFileOutputStream:
- when the stream is closed, the content stored in memory is *always*
flushed to disk (in DeferredFileOutputStream, instead, if the treshold
is not reached data is lost)
- DeferredFileOutputStream maintains data in memory only until the
treshold value has been reached, then it immediately writes every byte
to disk. Mine implementation, instead, caches treshold bytes in memory,
and every time that value is reached (that is, treshold, 2 * threshold,
etc), it flushes data to disk. In other words it acts as a cache.
Please find attached the class together with the unit test.
Best regards,
Michele
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the License); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.io.output;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Arrays;
import junit.framework.TestCase;
/**
* JUnit test case for [EMAIL PROTECTED] DeferredPeriodicOutputStream}.
*
* @author a href=mailto:[EMAIL PROTECTED]Michele Mazzucco/a
*
*/
public class DeferredPeriodicOutputStreamTest extends TestCase {
/**
* The test data as a string (which is the simplest form).
*/
private String testString = 0123456789;
/**
* The test data as a byte array, derived from the string.
*/
private byte[] testBytes = testString.getBytes();
/**
* Standard JUnit test case constructor.
*
* @param name
*The name of the test case.
*/
public DeferredPeriodicOutputStreamTest(String name) {
super(name);
}
/**
* Tests the case where the amount of data falls below the threshold,
and is
* therefore confined to memory.
*/
public void testBelowThreshold() {
File testFile = getTestFile(testBelowTreshold.dat);
DeferredPeriodicOutputStream dpos =
new DeferredPeriodicOutputStream(testBytes.length + 42,
testFile);
try {
dpos.write(testBytes, 0, testBytes.length);
dpos.close();
} catch (IOException e) {
fail(Unexpected IOException);
}
byte[] resultBytes = dpos.getData();
assertEquals(0, resultBytes.length);
verifyResultFile(testFile);
}
/**
* Tests the case where the amount of data is exactly the same as the
* threshold. The behavior should be the same as that for the amount of
* data being below (i.e. not exceeding) the threshold.
*/
public void testAtThreshold() {
File testFile = getTestFile(testAtThreshold.dat);
DeferredPeriodicOutputStream dpos =
new DeferredPeriodicOutputStream(testBytes.length, testFile);
try
{
dpos.write(testBytes, 0, testBytes.length);
dpos.close();
}
catch (IOException e) {
fail(Unexpected IOException);
}
byte[] resultBytes = dpos.getData();
assertEquals(0, resultBytes.length);
verifyResultFile(testFile);
}
/**
* Tests the case where the amount of data exceeds the threshold, and is
* therefore written to disk. The actual data written to disk is verified,
* as is the file itself.
*/
public void testAboveThreshold() {
File testFile = getTestFile(testAboveThreshold.dat);
DeferredFileOutputStream dfos =
new DeferredFileOutputStream(testBytes.length - 5, testFile);
try
{
dfos.write(testBytes, 0, testBytes.length);
dfos.close();
}
catch (IOException e) {
fail(Unexpected IOException);
}
Re: [collections] Problem with buffer serialization (posible bug?)
This sounds like a bug. It would be best to raise a JIRA report with a
small test case (not involving xstream)
Stephen
Huertas Fernández wrote:
Hi all, I'm having problems with serialization/deserialization of a Buffer. My
idea is to implement a persistent queue using the UnboundedFifoBuffer (well, I
want synchronized access, so I use SynchronizedBuffer too):
private Buffer queue = BufferUtils.synchronizedBuffer(new
UnboundedFifoBuffer());
When I serialize the queue to disk an it has elements, all works ok, but when I
serialize an empty queue I have some problems when I create a new object using
the serialized file(BTW, I'm using XStream 1.1.3 to produce the XML).
org.apache.commons.collections.buffer.SynchronizedBuffer
collection class=org.apache.commons.collections.buffer.UnboundedFifoBuffer
serialization=custom
org.apache.commons.collections.buffer.UnboundedFifoBuffer
default/
int0/int
/org.apache.commons.collections.buffer.UnboundedFifoBuffer
/collection
lock class=org.apache.commons.collections.buffer.SynchronizedBuffer
reference=../
/org.apache.commons.collections.buffer.SynchronizedBuffer
When I deserialize the queue it has a 'buffer' with size 1 (with null content),
'tail' and 'head' fields are 0 (they are declared transient). So, when I try to
add a new object to the queue, the sentence:
Object[] tmp = new Object[((buffer.length - 1) * 2) + 1];
Is executed in the add() method to increase the buffer length, but the buffer remains with the same size! (buffer.length = 1 -- (1 - 1) * 2 + 1 = 1). So, the object is added and when the tail is going to be incremented, it is reset to 0!!
private int increment(int index) {
index++;
if (index = buffer.length) {
index = 0;
}
return index;
}
So it is impossible to add new elements after an empty queue has been
serialized / deserialized.
I have solved it just not saving empty queues but deleting the file instead,
but I wanted to write to the list to know if this is a bug in the
UnboundedFifoBuffer or maybe is caused by the way Xtream serializes (but I
don't think so).
Thanks in advance,
Jose Luis.
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Re: [VFS] Snapshot timestamped version has disappeared from the m1 snapshot repo!
Vincent Massol wrote: No, quite the opposite. Working with thinner slices is always easier than working with bulk. Saying it differently, it's much easier to do regular releases than longer ones because less has changed. Take the example of Maven again. Releasing a plugin is really a breeze, including the votes. The same would be true of VFS. The core might require lots of thoughts as it's critical but the providers would be real easy to release. This whole debate is a matter of perspective - cargo and vfs have very different perspectives on two points: - community - ease of release Cargo, and hence maven, comes to the table with a decent-sized community and the full knowledge and use of maven. Together these two points probably do make releasing a plugin 'a breeze'. However vfs is effectively a single person project (at present), and does not heavily use maven. (Commons does use maven, but does not have the background knowledge, desire, etc to commit fully to it, in particular maven version 2). Together, these points make it virtually inconceivable to release lots of small jars, one per filesystem. To further complicate this, commons rules currently effectively require every release to be manually checked by every voter. Or to put it another way, there is no trust of the releasable artifacts, maven generated or not. (In fact, I typically raise more issues with a maven generated release than a non maven generated release.) My point here is that IMHO the 'correct' solution is a single core jar, plus one jar per filsystem, together with an 'all' jar for users who want everything in one go. But such a solution is unfortunately not viable in the commons of today. Which is one reason why commons does not release early release often. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] key Value Pair allowing duplicates
Look at the MultiMap interface and the MultiValueMap implementation (v3.2). Stephen Rajat Sharma wrote: HI all, Let's say I have a view in the DB which send me back the following values CUSTNAME IPADDRESS A 1 A 2 A 1 B 5 B 5 This table is present in the resultSet I get back from the Database. But, I wanted the above to be put into some kind of collection (which would also allow duplicates). Now, most of the collections do not allow duplicate keys. I want a way where I am doing something like MyCollection.getListByKey(CUSTNAME). The result is returned into a list. What's the best way to achieve this ? Thanks Raj - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[collections] Re: Why doesn't Bag have a get() method?
Get what? What method signature are you expecting? What is your use case? Stephen - Original Message From: Timo Nentwig [EMAIL PROTECTED] To: Jakarta Commons Users List commons-user@jakarta.apache.org Sent: Thursday, 13 July, 2006 2:39:59 PM Subject: Why doesn't Bag have a get() method? Hi! Well, see subject: why doesn't Bag have a get() method? Doesn't make sense, does it? Timo - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Re: Why doesn't Bag have a get() method?
Nentwig, Timo wrote: Stephen Colebourne wrote: Get what? What method signature are you expecting? What is your use case? Well, get what I did add(). Get that what contains() is checking for. Get what getCount() is counting. I believe that you want the method: public Object get(Object); that would return the object within the Bag that is equal to the object you pass in. This has been discussed before as a deficiency in the Java Collections Framework wrt the Set interface. At present, the workaround in Java is to use a Map where the key and value are the same object. As to your question, why doesn't Bag have such a method, the answer is because the original coders didn't see the need for it. And since its an interface, there is no way for us to change it now. It is also very difficult to implement as the Java Collections Framework doesn't provide such a method. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] IteratorChain(Iterator) should be meta!
IteratorChain is the right class, but the constructor just adds the one iterator. You could use the Iterator(Collection) constructor which adds a collection of Iterators. Perhaps use IteratorUtils.toList to create the list? Alternatively, you could patch IteratorChain to add a factory method that takes an iterator and does what you wanted. Stephen Paul Libbrecht wrote: Hello, only after a looong quest I realized that new IteratorChain(Iterator) will only iterate through the elements of the given iterator instead of expecting that each element is an iterator itself through which one iterates. Am I blurred to expect such ? I suppose that changing this behaviour would be a too strong API change... so should one do an IteratorThroughIterators?? I can offer a class... if wished. paul - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [IO] - Wildcard filter for directories
I am looking to handle this behaviour by reworking the filter. See also http://issues.apache.org/jira/browse/IO-81 Stephen Heiko wrote: Hallo, two questions concerning the org.apache.commons.io.filefilter package: - I would like to have wildcard filtering for directories, but WildcardFilter works only for plain files. So I just implemented a class DirectoryWildcardFilter. Could that class be of interest to the commons-io package? - I would have assumed that the wildcard matching is done via org.apache.commons.io.FilenameUtils.wildcardMatchOnSystem, but is isn't. I'm not sure if * the existing WildcardFilter should be extended by a useMatchOnSystem method or likewise, * a new WildcardOnSystemFilter would be better * ... Sorry if i ask a already answered question but I couldn't find it in the more recent list archives. Greetings Heiko Blau - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Question about ClosureUtils.invokerClosure paramTypes parameter
Your wrapped code does not handle null arguments. And
that is why [collections] doesn't do it that way.
Stephen
--- Nikita Zhuk [EMAIL PROTECTED] wrote:
Hello,
I have a question about Commons Collections' (v 3.2)
invokerClosure()
method of ClosureUtils class. Currently the method
signature is:
public static Closure invokerClosure(String
methodName, Class[]
paramTypes, Object[] args)
I would like to know why there has to be explicit
paramTypes
parameter, i.e. is there something wrong in calling
.getClass() on
each argument (which returns actual class of an
object due of
polymorfism)? In my code I've wrapped that call as
following:
public static Closure invokerClosure(String
methodName, Object[]
args)
{
Class[] paramTypes = new
Class[args.length];
for(int i = 0; i args.length; i++)
{
paramTypes[i] = args[i].getClass();
}
return
ClosureUtils.invokerClosure(methodName, paramTypes,
args);
}
- Nikita Zhuk
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Re: ListOrderedMap vs. LinkedHashMap
ListOrderedMap is a decorator. It can wrap _any_ type of map and make it ordered. Stephen [EMAIL PROTECTED] wrote: Hello All - Apologies if this has already been covered. I couldn't find an easy way to search through this mailing list's archives. What is the difference between org.apache.commons.collections.map.ListOrderedMap (from commons-collections-3.2) and java.util.LinkedHashMap (Java 1.5)? It seems to me that they both implement a map while retaining order. Am I missing something? Thanks! -Marc - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: LRUMap NullpointerException
Can you also check all loops of the map are synchronized correctly:
synchronied (map) {
Iterator it = mpap.keySet().iterator();
while (it.hasNext()) {
..
}
}
and so on. The synchronized MUST be around the whole looping.
Stephen
Thilko Richter wrote:
Hi there,
we used Version 3.2 and synchronized all access to LRUMap. WE get this
IllegalStateException. Can you reproduce this behauviour?
2006-06-14 00:26:22,359 [ERROR] BaseDataLoggerGate.com.sunreader.sr2.gate.BaseDataLoggerGate.doPost:
java.lang.IllegalStateException: Entry.next=null, data[removeIndex]=ObjectId:TblStatusstatus=ins=org.objectstyle.cayenne.DataRo..f1d2ce[values={description=inserted, status=ins}, version=-9223372036854491432, replaces=-9223372036854775808] previous=ObjectId:TblEffBlockDataeffBlockDataId=24455598[EMAIL PROTECTED], efficiencyValue=1.0761, effBlockDataId=24455598, energyValue=8.16, efficiencyBlockId=767, status=ins, irradiationValue=673.98, earnings=4.4064, importEffBlockDataId=1042169, dataDate=Mon Jun 12 11:30:00 CEST 2006, co2Saving=6.12}, version=-9223372036854494908, replaces=-9223372036854495032] key=ObjectId:TblLoggerloggerId=923 [EMAIL PROTECTED], newSerialNumber=null, commChannelType=analog, loggerProductId=1, loggerId=923, serialNumber=DL-NE101-01331, commChannelManufacturer=Conergy}, version=-9223372036854491407, replaces=-9223372036854775808] size=1 maxSize=1000
0
Please check that your keys are immutable, and that you have used synchronization properly. If so, then please report this to commons-de..akarta.apache.org as a bug.
at org.apache.commons.collections.map.LRUMap.reuseMapping(LRUMap.java:300)
at org.apache.commons.collections.map.LRUMap.addMapping(LRUMap.java:266)
at org.apache.commons.collections.map.AbstractHashedMap.put(AbstractHashedMap.java:283)
at org.objectstyle.cayenne.access.DataRowStore.processUpdatedSnapshots(DataRowStore.java:621)
at org.objectstyle.cayenne.access.DataRowStore.processSnapshotChanges(DataRowStore.java:575)
at org.objectstyle.cayenne.access.DataRowStore.snapshotsUpdatedForObjects(DataRowStore.java:314)
at org.objectstyle.cayenne.access.ObjectResolver.objectsFromDataRows(ObjectResolver.java:159)
at org.objectstyle.cayenne.access.ObjectResolver.synchronizedObjectsFromDataRows(ObjectResolver.java:134)
at org.objectstyle.cayenne.access.DataDomainQueryAction.interceptObjectConversion(DataDomainQueryAction.java:375)
at org.objectstyle.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:151)
at org.objectstyle.cayenne.access.DataDomain.onQuery(DataDomain.java:765)
at org.objectstyle.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:253)
at org.objectstyle.cayenne.access.DataContextQueryAction.execute(DataContextQueryAction.java:90)
at org.objectstyle.cayenne.access.DataContext.onQuery(DataContext.java:1422)
at org.objectstyle.cayenne.access.DataContext.performQuery(DataContext.java:1411)
at com.conergy.sunreader.sr2.back.dao.ProductDAO.isLoggerAlreadyAvailable(Unknown Source)
Thanks a lot,
Thilko
After extensive testing, we can only reproduce this when the map has not
been correctly synchronized, or a mutable key has been used (as opposed
to an immutable one).
If you upgrade to collections v3.2 you will get extra logging which may
help diagnose the problem.
Stephen
Thilko Richter wrote:
Hi all,
I am working with Cayenne and I ´ve get the following Exception:
Caused by: java.lang.NullPointerException
at
org.apache.commons.collections.map.LRUMap.reuseMapping(LRUMap.java:272)
at org.apache.commons.collections.map.LRUMap.addMapping(LRUMap.java:243)
at
org.apache.commons.collections.map.AbstractHashedMap.put(AbstractHashedMap.java:282)
at
org.objectstyle.cayenne.access.DataRowStore.processUpdatedSnapshots(DataRowStore.java:621)
at
org.objectstyle.cayenne.access.DataRowStore.processSnapshotChanges(DataRowStore.java:575)
at
org.objectstyle.cayenne.access.DataRowStore.snapshotsUpdatedForObjects(DataRowStore.java:314)
at
org.objectstyle.cayenne.access.ObjectResolver.objectsFromDataRows(ObjectResolver.java:159)
at
org.objectstyle.cayenne.access.ObjectResolver.synchronizedObjectsFromDataRows(ObjectResolver.java:134)
at
org.objectstyle.cayenne.access.DataDomainQueryAction.interceptObjectConversion(DataDomainQueryAction.java:375)
at
org.objectstyle.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:151)
at
org.objectstyle.cayenne.access.DataDomain.onQuery(DataDomain.java:765)
at
org.objectstyle.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:253)
at
org.objectstyle.cayenne.access.DataContextQueryAction.execute(DataContextQueryAction.java:90)
at
org.objectstyle.cayenne.access.DataContext.onQuery(DataContext.java:1422)
at
org.objectstyle.cayenne.access.DataContext.performQuery(DataContext.java:1411)
at
Re: [collections] LRUMap NullpointerException
After extensive testing, we can only reproduce this when the map has not been correctly synchronized, or a mutable key has been used (as opposed to an immutable one). If you upgrade to collections v3.2 you will get extra logging which may help diagnose the problem. Stephen Thilko Richter wrote: Hi all, I am working with Cayenne and I ´ve get the following Exception: Caused by: java.lang.NullPointerException at org.apache.commons.collections.map.LRUMap.reuseMapping(LRUMap.java:272) at org.apache.commons.collections.map.LRUMap.addMapping(LRUMap.java:243) at org.apache.commons.collections.map.AbstractHashedMap.put(AbstractHashedMap.java:282) at org.objectstyle.cayenne.access.DataRowStore.processUpdatedSnapshots(DataRowStore.java:621) at org.objectstyle.cayenne.access.DataRowStore.processSnapshotChanges(DataRowStore.java:575) at org.objectstyle.cayenne.access.DataRowStore.snapshotsUpdatedForObjects(DataRowStore.java:314) at org.objectstyle.cayenne.access.ObjectResolver.objectsFromDataRows(ObjectResolver.java:159) at org.objectstyle.cayenne.access.ObjectResolver.synchronizedObjectsFromDataRows(ObjectResolver.java:134) at org.objectstyle.cayenne.access.DataDomainQueryAction.interceptObjectConversion(DataDomainQueryAction.java:375) at org.objectstyle.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:151) at org.objectstyle.cayenne.access.DataDomain.onQuery(DataDomain.java:765) at org.objectstyle.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:253) at org.objectstyle.cayenne.access.DataContextQueryAction.execute(DataContextQueryAction.java:90) at org.objectstyle.cayenne.access.DataContext.onQuery(DataContext.java:1422) at org.objectstyle.cayenne.access.DataContext.performQuery(DataContext.java:1411) at org.objectstyle.cayenne.access.DataContextFaults$ToOneFault.doResolveFault(DataContextFaults.java:144) at org.objectstyle.cayenne.access.DataContextFaults$ToOneFault.resolveFault(DataContextFaults.java:117) at org.objectstyle.cayenne.CayenneDataObject.readProperty(CayenneDataObject.java:245) at com.conergy.sunreader.sr2.back.auto._TblAccount.getTblPerson(Unknown Source) at com.conergy.sunreader.sr2.back.dao.UserDAO.setAccountPersonData(Unknown Source) at com.conergy.sunreader.sr2.back.dao.UserDAO.getUser(Unknown Source) at com.conergy.sunreader.sr2.back.dao.UserDAO.login(Unknown Source) at com.conergy.sunreader.sr2.back.proxy.CayenneProxy.login(Unknown Source) at com.conergy.sunreader.sr2.back.BusinessFacade.login(Unknown Source) at com.conergy.sunreader.sr2.struts.actions.Sr2BaseAction.loginUser(Unknown Source) ... 31 more We have posted this exception in cayenne newsgroup before and we found out, that the caller of LRUMap is responsible for the thread safety. We´ve changed some methods calls in caeynne temporarily, but we still get this exception. Could anyone help us and tell, waht was going wrong here? We using commons-collection v.3.1 This behauvior occurs when the machine is under heavy load and a lot threads access are created. Thanks in advance, Thilko - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] Bag sorted by count
Paul Dlug wrote: I'm happy to provide a patch since I already have an implementation completed. The best way I can think of to take this is to provide two methods to AbstractMapBag: public Object[] getSortedCount(); public Object[] getSortedCount(Comparator c); Please let me know if List() is preferable to Object[], from the research I've done so far it appears that a Set must be copied into a List or Array in order to sort it. It seems to me that better performance would be achieved with Set.toArray() and Arrays.sort() The second method would be used to provide a second level comparator (first sort by count, if there's a tie sort by Comparator). This is useful to do something like sorting categories by count and then alphabetically. This could alternatively be placed in BagUtils but I think it's cleaner to have it as an instance method on the Bag itself. Hmmm. I've just taken a look at the code, and its not as simple as I thought. I believe that we could take your methods as you propose and it would work, however, I'm not sure thats the best way. My problem is that the methods involve copying the data to another list (List not Object[]) to return it. It feels like a core bag competancy. Really, this would seem to be a SortedBag (TreeBag) where the comparator checks the count. But it could be hard to write a TreeBag comparator that does this (I haven't really checked). Thus the whole bag is kept sorted by count, and normal bag methods can then be directly used to extract the data. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [IO] writeStringToFile( File, String, String ), when File does not exist
Jamie Bisotti wrote: As I mentioned in my original post...The JavaDoc for writeStringToFile() says: Writes a String to a file creating the file if it does not exist. That seems to imply that directories would be created, if need be; however, that is not happening. Is this a bug? Or does the documentation just need to be clarified? It does not say anything about directories having to exist; it says the file will be created if it does not exist. [snip] Is this a bug or an incomplete comment, in need of clarification? It isn't a bug, but a reasonable enhancement. (At the minimum the javadoc should be improved). Please raise a JIRA call. We'd also welcome a fix and test case if you have time. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] Bag sorted by count
Paul Dlug wrote: Hopefully a simple question... Is there an implementation of Bag that returns its elements sorted by their count? I can't seem to find an elegant way to implement this (it seems like the comparator would need a reference to the Bag it is comparing elements for to do this with a TreeBag). We have no such implementation. Its not a bad idea though. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] removeAll(Collection collection, Collection remove)
Why not download the source and take a look? Stephen Lazarte, Ivan wrote: How exactly does this method remove one from the other? Object identity or equality? We instantiated two different sets which should have overlapping objects in terms of values, but when we tried to remove one from the other, nothing happened. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] removeAll(Collection collection, Collection remove)
I would always advise having the source to hand. If you have collections 3.2 there's a source zip ready to attach to an IDE in the binary download. I haven't checked because I'm lazy, but I'd expect this to match using .equals() as with all other Java Collections Framework matchling. Stephen Lazarte, Ivan wrote: Yes, but I'm laaazy (meaning I'm getting tired of 60 hour weeks) :) I'll take a crack at it later I suppose... -Original Message- From: Stephen Colebourne [mailto:[EMAIL PROTECTED] Sent: Thursday, May 25, 2006 6:41 PM To: Jakarta Commons Users List Subject: Re: [collections] removeAll(Collection collection, Collection remove) Why not download the source and take a look? Stephen Lazarte, Ivan wrote: How exactly does this method remove one from the other? Object identity or equality? We instantiated two different sets which should have overlapping objects in terms of values, but when we tried to remove one from the other, nothing happened. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[ANNOUNCE] Commons Collections 3.2 released
The Commons Collections team is pleased to announce the release of commons-collections-3.2. Commons Collections is a library that builds upon the Java Collection Framework. It provides additional Map, List and Set implementations and utilities. It also builds on the framework by providing new interfaces and implementations. This release fixes numerous bugs, and adds a limited number of enhancements, including: - MultiValueMap - A flexible MultiMap implementation - DefaultedMap - A map that returns a default value when the key is not found - GrowthList - A list where set and add expand the list rather than throw IndexOutOfBoundsException - LoopingListIterator - A never-ending list iterator - CollectionUtils.addIgnoreNull - Adds to the collection if the value being added is not null - isEmpty - Checks maps and collections for empty or null - BlockingBuffer - Add timeout handling to any buffer implementation - ListOrderedMap - additional list-style methods This release is binary and source compatible with 3.1 according to our tests. There are two new deprecations, see the release notes for details. We recommend all users of commons-collections to upgrade to 3.2 to pickup the bug fixes. Commons Collections Website: http://jakarta.apache.org/commons/collections/ Release notes: http://jakarta.apache.org/commons/collections/release_3_2.html Download: http://jakarta.apache.org/site/downloads/downloads_commons-collections.cgi Enjoy! The Commons Collections Team - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] ReversePredicate
This looks like NotPredicate to me ;-)
Stephen
Lazarte, Ivan wrote:
I didn't see a reverse predicate object in the 3.1 api, so I wrote one
quickly. Enjoy!
package your.package.goes.here.dude;
import org.apache.commons.collections.Predicate;
/**
* Take a predicate as a value and reverse the sign.
*/
public class ReversePredicate implements Predicate {
Predicate predicate;
public ReversePredicate(Predicate predicate) {
this.predicate = predicate;
}
public boolean evaluate(Object object) {
return (predicate.evaluate(object) == true) ?
false : true;
}
}
Ivan Lazarte
Web Application Developer
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Re: [commons-net] listFiles failing to parse Apr 26 02:45 like dates
David Waitzman wrote: The fix I made was to force the FTP timezone to be UTC using: FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX); conf.setServerTimeZoneId(UTC); ftpClient.configure(conf); The UTC timezone has no daylight savings time so all the times are valid. I'd rather keep my default timezone but turn off daylight savings time transitions, but I don't know how to do that. (Any suggestions?) The only way to turn off time zone transitions is to: a) pick either summer or winter time (usually the one without daylight savings) b) find out the offset c) use the offset as a fixed offset, eg 'GMT+02:00' Of course the time will only be accurate half the year... Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Compatability between Commons-Collections 2.1.1 and 3.1
Versions 2.1.1 and 3.1 are fully compatible so long as Hibernate does not utilise any method or class that is deprecated in v2.1.1. Figuring out whether that is true or not probably involves downloading the source for Hibernate and cross referencing the collections imports. The problems only affected a tiny area of code, so you may just find it works anyway. See http://jakarta.apache.org/commons/collections/compatibility.html for some more info. Stephen [EMAIL PROTECTED] wrote: Hello, I am currently using Hibernate 3.1 which depends on Commons-Collections 2.1.1. I am now adding Quartz 1.5.2 to my project, but it uses Commons-Collections 3.1. I have read the history of this project and it seems to indicate that I would be able to use Commons-Collections 3.1 and it would have no reprecusion to how Hibernate 3.1 works. However, I would like to get a verification from those in the know about Commons-Collections. thanks, Courtney B. Arnold - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Using Predicate
Your problems may be due to the fact that two arrays with the same contents are not equal (the equals() method doesn't return true). This is a historic oddity in Java. If you change each of your collection elements to be a List instead of an array I expect that the predicate would work. Stephen Carlos Chavez wrote: Hello people, I have a collection where each items is a array of object( object[] ), I want to use UniquePredicate to filter each item based on two items in the array (object[]) But, i can't figure out how the UniquePredicate work. the docs says: Evaluates the predicate returning true if the input object hasn't been received yet. I want to extend this for my object[], but i don't know at wich moment this predicate indicate that the element exist in the collection. any help are welcome. Cheers. -- Carlos Chávez - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[ANNOUNCE] Commons IO 1.2 released
The Commons IO team is pleased to announce the release of commons-io-1.2. Commons IO is a library of utility, file filter, endian and stream classes that aim to make working with IO much more pleasant. Many of these classes probably should be in the JDK itself. This release fixes a few bugs (notably LockableFileWriter), and adds various enhancements, including: - LineIterator - Allows you to work through a file using an iterator style API - AgeFileFilter - Filter files by their age - SizeFileFilter - Filter files by their size - FileSystemUtils - Obtain the free space on a drive in kb (improves on previous version of the method by normalizing operating systems to kb) - FileUtils method to iterate of a list of matched files This release is binary and source compatible with 1.1 according to our tests. There are no new deprecations. We recommend all users of commons-io-1.1 upgrade to 1.2 to pickup the bug fixes. Commons IO Website: http://jakarta.apache.org/commons/io/ Release notes: http://jakarta.apache.org/commons/io/upgradeto1_2.html Download: http://jakarta.apache.org/site/downloads/downloads_commons-io.cgi Enjoy! The Commons-IO Team - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: upload file [FileUpload]
Typo: enctypetype Stephen Marc Collin wrote: Le Dimanche 12 Mars 2006 02:08, Brian K. Wallace a écrit : Marc - Make sure you're using POST, not GET on your form. Brian i use post form action=Upload method=POST enctypetype=multipart/form-data input type=file name=file input type=SUBMIT name=button value=Envoie /form - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] Facing Design Issue
Think about what is most important, then next important and so on. It seems that time is most important to you. Then the grouping by id. But its not clear what kind of qery you will make There doesn't seem to be one collection that will fit. Try looking at - MultiHashMap to hold a list of objects against a single key - MultiKeyMap to use multiple keys to lookup a single value - MultiKey or an array to hold multiple objects as one object - TreeMap to keep the keys sorted Stephen Rajat Sharma wrote: Hi, I have the following stringswhich are currently in an arraylist. Instance Date TimeVar-1 Var-2 65793 02/24/2006 00:00:00 1 1 66049 02/24/2006 00:00:00 1 1 66305 02/24/2006 00:00:00 0 0 66561 02/24/2006 00:00:00 1 3 66817 02/24/2006 00:00:00 7 4 67073 02/24/2006 00:00:00 0 0 67329 02/24/2006 00:00:00 9 16 68353 02/24/2006 00:00:00 1 1 66817 02/24/2006 00:02:30 2 2 67073 02/24/2006 00:02:30 0 0 67329 02/24/2006 00:02:30 9 9 68353 02/24/2006 00:02:30 1 1 68609 02/24/2006 00:02:30 7 7 68865 02/24/2006 00:02:30 0 0 69121 02/24/2006 00:02:30 0 0 69377 02/24/2006 00:02:30 1 1 69633 02/24/2006 00:02:30 0 0 65793 02/24/2006 00:03:00 1 0 One thing unique in the above table is the time on a per instance basis. Var-1, and Var-2 are the attributes of the instance at any given time. What I need is a very clean way to wrap these under collections framework, a) Such that all the instances having the same ID are in their own Collections b) Most importantly, I could sort them with time. So all the unique instances help create separate tables each having the same ID, which can then be sorted on Date\Time such that sub-lists could be created which fall under the range of time given. I am almost a beginner in collections and don't know if this is possible. Please note that, the above is not simly key-pair values but key-value-value Could someone help me. Regards, Raj - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Regex Map?
Eric Savage wrote: I have a need for a map that has regex patterns as the key. I didn't see anything in collections (or anywhere else) that does this. Could someone confirm that? If it doesn't exist, I'll have to write it, and I would be happy to contribute it if its desired. We don't have such a thing at present. Its a little difficult to know how you'll create it as the key of a hashmap needs to be distinct, unique and immutable. Since [collections] depends on JDK1.2 and no other jar files, including a regexp map in [collections] isn't possible ATM. Feel free to submit a bugzilla request with your code if you wish, as it may benefit some user indirectly. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [COMMONS-CODEC]
Are you able to supply a small test case to demonstrate the bug? That is the most useful item. If so, can you create a bugzilla bug call, thanks. Stephen Alex wrote: Hello, i think i have found a bug in class Base64, the method (isBase64(byte octet)). I say because i have passed a X509Certificate in DEREncoded (so none Base64 byte[]). This method returns an IndexOutOfBoundsException: -128. I think that the problem is in line (base64Alphabet[octect] == -1) because it is the line where it crash and also because it is the only place where an array is referenced. Im so sure that the byte octet is the -128 value, so index out of bounds are throwed. I have modified that class, i suppose that i would have to upload some place, but i don't know where. Can anybody told me if im correct and where i could send the class? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Commons Collections and generics?
Calum MacLean wrote: I'm using Java 5.0, and I was wondering what the latest is on Commons Collections support for generics. I'm aware that there have been a couple of different efforts to do this: http://sourceforge.net/projects/collections, http://larvalabs.com/collections/ http://collections15.sourceforge.net/, http://sourceforge.net/projects/collections15 However, it's not clear what the status of these efforts is - how complete they are. It's also not clear what the official Commons Collections stance is on creating a generics implementation of Commons Collections, or on these 2 efforts in particular. Does anyone have more info? Also, does the apparent lack of interest in a generics implementation of Commons Collections suggest that hardly anyone is actually using Java 5.0...? http://collections15.sourceforge.net/ has seemed to be the most active project. The main issue is lack of developers at commons to host the code here. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] When to use a Predicate?
Bernard, Shawn wrote: Under what circumstanes would one use a Predicate to encase conditional logic? I know it's a rather broad question, but I was looking at them and they seem pretty powerful, but I wouldn't want to use them incorrectly. If you like the functor style of programming then go ahead and use it! There is a potential downside in terms of extra classes and object instantiation, but on modern JVMs thats not really a big issue. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [commons-lang] Xml escaping
Have you got a specification link that you believe we are breaking? Stephen Milosh Milosavljevic wrote: Hi, I am not sure why StringEscapeUtils.escapeXml always tries to escape high ascii characters together with xml entities. In case that this is just an issue connected to HTML escaping, I would suggest to make a flag for high ascii escaping. I did that flag in my local branch of commons-lang and I can send it to you if there is a need. Thanks, Milosh - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: is collections 3.x code compatible with collections 2.x
v3.x is fully source compatible with v2.1, with the exception that any methods or classes that were deprecated in v2.x were removed. v3.x is binary compatible EXCEPT for IteratorUtils. See http://jakarta.apache.org/commons/collections/compatibility.html for full details of the chosen workaround. Obviously we recommend using v3.1 as opposed to v3.0. Also note that we are working towards v3.2 at the moment. Stephen --- [EMAIL PROTECTED] wrote: I just want to know that whether collections 3.x code compatible with collections 2.x . Do i have to make some changes in my code if i switch from 2.x to 3.x please kindly reply as soon as possible with regards, Rishi Mishra Accenture Services Pvt. Ltd. Mumbai-79 This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any other use of the email by you is prohibited. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: is JDK1.3 commpatible with Commons collection3.0
Yes. [collections] runs on JDK1.2 or later. Please note however that collections 3.1 was released some time ago, and you shoud use that if at all possible. Stephen --- [EMAIL PROTECTED] wrote: please answer whether with jdk1.3 can we use commons collection 3.0 with regards, Rishi Mishra Accenture Services Pvt. Ltd. Mumbai-79 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Id] Help getting started
Try http://cvs.apache.org/builds/jakarta-commons/nightly/commons-id/ and http://jakarta.apache.org/commons/discovery/ Stephen Rakesh Patel wrote: i was looking for some code that generates a unique value that i could use as a token when establishing sessions in web services. I came across the Commons Id component and it looked like what i needed. However, I'm not sure how to get hold of it. I use the eclipse cvs plug in. I managed to download the commons id code but it didn't work because of dependencies with discovery. When i went to find that, the directory structure was there (with an additional services sub dir for some reason) but no source files. Normally, I download jars and get going. Not sure how to use this code. Can anyone help? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] MultiKeyMap vs concatenating keys that are strings
The short answer is to say, this is open source, so look at the source ;-) The longer answer is that MultiKeyMap uses specially optimised data structures internally to store the key parts. This avoids any hacky (and slow) string concatenation. Given a choice, I would always use a MultiKeyMap for a multiply-keyed map. Stephen Mark Shifman wrote: Hi: If I am building a map with a compound key composed of say 3 strings , is there any advantage to using MultiKeyMap over a regular Hash(ed)Map with the key = key1+_+key2+_+key3; speed?..elegance?? thanks in advance mas - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[ANNOUNCEMENT] Commons IO 1.1 released
The Commons IO team is pleased to announce the release of commons-io-1.1. Commons IO is a library of utility, file filter, endian and stream classes that aim to make working with IO much more pleasant. Many of these classes probably should be in the JDK itself. This release fixes all open bugs, and adds various enhancements, including: - FilenameUtils - A static utility class for working with filenames without File objects - FileSystemUtils - A static utility class that allows you to get the free space on a drive - IOUtils/FileUtils - read and write files line by line into a List - WildcardFilter - A new filter that can match using wildcard file names This release is binary and source compatible with 1.0 according to our tests. There are some minor semantic changes caused by bug fixes which should not affect the vast majority of 1.0 users - please check the release notes for full details. To simplify the API, there has also been a deprecation - please check the release notes. We recommend all users of commons-io-1.0 upgrade to 1.1 to pickup the numerous bugs fixes. Commons IO Website: http://jakarta.apache.org/commons/io/ Release notes: http://jakarta.apache.org/commons/io/upgradeto1_1.html Download: http://jakarta.apache.org/site/downloads/downloads_commons-io.cgi Enjoy! The Commons-IO Team - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: MultiMap?
--- Andrei Polushin [EMAIL PROTECTED] wrote: The classes in 2nd-level packages (like in org.apache.commons.collections.map) are 'decorators'. They are not interfaces (like MultiMap), and not self-contained implementations (like MultiHashMap). Sorry, but this isn't entirely correct. There are concrete implementations in the org.apache.commons.collections.map package, such as HashedMap, LinkedMap and LRUMap. There are also the implementations of the decorators. Personally, I would recommend using the decorators directly via their decorate() static factory methods rather than via MapUtils. The interfaces are in the base package and will remain there. (Note this all refers to v3.0 and onwards of collections) Why is MultiHashMap not in the map package? Because there wasn't time to rewrite it for v3.0 (or 3.1). A new class - MultiValueMap - will exist in the map package for v3.2, and will replace MultiHashMap. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Basic questions about VFS
--- Mario Ivankovits [EMAIL PROTECTED] wrote: The main problem is the lack of support in the underlaying libraries. Even for local files we might need a native library (I hate native libraries) to set permissions as there is no real support in java.io.file. See [io] FileSystemUtils for an example of using the command line from Java to get the free space on the drive. You could extend this [io] class to add file permissions. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [email] Commons-Email -- not J2EE 1.3?
Asleson, Ryan wrote: Hello, I just tried using Commons-Email RC5 on WebLogic 8.1. When using the Email.addTo method, I receive a NoSuchMethodError. It appears that the Email class is attempting to use InternetAddress.validate(), which is part of J2EE 1.4, not 1.3. Since I'm using WebLogic 8.1, which is only J2EE 1.3, it looks like I'm stuck. Is there any way around this? This sounds like something that should be fixed. Not sure what the alternative to this method is though... Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [POLL][VFS] how to resolve relative filenames
Mario Ivankovits wrote: I would like to know how you think VFS should resolve filenames relative to another filename. There is a request to change VFS's current behaviour. Consider the following root: file:///my/root/file and this relative filename any/child/file currently VFS resolve it to file:///my/root/file/any/child/file In FilenameUtils in [io] we use the same as above: assertEquals(a + SEP + b + SEP + f, FilenameUtils.concat(a/b/, f/)); assertEquals(a + SEP + b + SEP + f, FilenameUtils.concat(a/b, f)); [ ] Use URI style [X] Keep current behaviour [ ] Minimum jdk 1.4 [X] Minimum jdk 1.3 Too many people (including large corporations) still use JDK1.3 Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [feedparser] Is an easy way to obtain the source code?
Vernon wrote: Since there isn't a download version neither a working CVS URL, is an easy way to obtain the source code? btw, I don't the status of this project. The last change was this February. Is it an active project? This project is in a strange state. Its now in commons-proper, but the website is in commons-sandbox. And I don't remember any recent emails on the component. CVS is no more, use SVN instead http://svn.apache.org/viewcvs.cgi/jakarta/commons/proper/feedparser/trunk/?rev=233041 Probably should be demoted back to the sandbox. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] MultiHashMap - retrieving values in the order in which they were added
Alice Boxhall wrote: Just a quick question re MultiHashMap: For my current project I need to be able to ensure that if I do map.put(foo, a); map.put(foo, b); ((Collection)map.get(foo)).iterator(); I will get a and b back in that order. Obviously with the current implementation this will be the case, but I was wondering if there was some way that I could ensure that in case the implementation changes. If not, no big deal, I can easily work around it. 1) there are no plans to change this. 2) IIRC there is a protected method in MultiHahsMap that returns the new collection (so you can subclass and force it) 3) You might want to try the new and improved MultiValueMap in the map subpackage (not released yet). It allows you much greater control over this type of class, and is the designated replacement for MultiHashMap. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Exception handlers
commons-lang exception package is worth checking out, notably ExceptionUtils. Stephen [EMAIL PROTECTED] wrote: I wonder what package in jakarta commons 'handles' exceptions (no pun intended) I need to be able to get as a String all the info thrown by the baseline JVM, JDBC or JMX drivers, or programmatically generated like this: (throw new Exception(Testing thrown Exception)) So which package should I use THanks Albretch - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] performance results?
amol k wrote: I am looking for any performance related statistics for the collections package. Particularly interested in knowing how the various methods in CollectionUtils perfom under very large data sets and problems, if any, that any of us may have encountered while managing large collections using the calls in CollectionUtils. Unfortunately, I am unaware of any performance testing of [collections], other than of individual classes: - TreeList is faster than LinkedList, and can for some cases be faster than an Arraylist - Flat3Map is faster than a HashMap at size 3 or less If anyone did any more performance testing, hopefully they can share their results with the list. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Commons, Collections, JXPath] Looking for more to read, pros/cons of filtering methods
Bernard, Shawn wrote: For the record, my initial post on this topic had a subject line of: [Collections, JXPath] advantages/disadvantages My question was: [W]hat are the advantages/disadvantages of using Predicate/Closure's to filter Collections of beans as opposed to using JXPath? JXPath (or EL/JEXL) is simply a way of getting a piece of data from a complex structure (XML or Bean). Functors can be used for this purpose too (and might perform slightly faster as the code is real, not interpretted from a parsed string). However, functors are really intended for deeper problems, specifically actually performing processing. See http://www.onjava.com/pub/a/onjava/2004/12/22/jakarta-gems-1.html?page=last for a good example. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Name that data structure
Wendy Smoak wrote: I put together a simple example that demonstrates the problem: http://wiki.wendysmoak.com/cgi-bin/wiki.pl?CircularFifoBuffer Bug? Surely I'm not doing anything wrong by calling remove(...) on a Collection? (Inefficient though it may be, first I just want to see it work.) Your wiki indicates that this is solved in SVN. Is this the case? Meanwhile, is there another way I can get the buffer to be in the correct LRU order? The LRUMap did work, but it's ugly having to put the empty String into the Map, when I don't need key/value pairs. Our only LRU implementation is LRUMap at present. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [codec] experience with phonetical encoders in other languages ?
Resending to correct project - [codec] Paul Libbrecht wrote: Hi, I would like to know wether the phonetical encoders found in commons-io have been used by someone with different langauges than English. I'm pretty sure they fail for Chinese at least but I'd like to know if Soundex and Metaphone have a chance for, say, european languages... thanks - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Expressions, Collections, Filtering oh my..
Poppe, Troy wrote: I've got a collection of a JavaBeans, it could be a plain-old-Java collection or a Commons-Collection... Not really a concern... I'm trying to find a way to provide the ability to write a JEXL-like expression that would be applied against the collection of JavaBeans, and be able to retrieve all of the JavaBeans that match that JEXL-like expression. So far, looking at JEXL, it looks like it requires a JexlContext, but I don't see or know how I would adapt my JavaBean properties to this. Is there an out-of-the-binary way of filtering through my JavaBeans, and giving me access to those that match some expression? With commons-collections, the best approach is to write a Predicate instance (typcially an inner class), and use CollectionUtils.filter or PredicateCollection to do the filtering. No specific JEXL handling though. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [functor] Still maintained?
paul womack wrote: I'm confused. Do you mean the rather wonderful stuff in org.apache.commons.collections.functors? Sorry. the OP (who's message I didn't get, BTW) obviously meant http://jakarta.apache.org/commons/sandbox/functor/ and not http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/org/apache/commons/collections/functors/package-summary.html The existence (and overlap) of these 2 packages is itself a Bad Thing. Not necessarily. The commons charter encourages alternate implementations. The [functor] project exists because the original author couldn't refactor the original code in [collections]. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: AbstractHashedMap deserialization
Can you raise this in Bugzilla, it definitely sounds like a bug. thanks Stephen --- Marcos César de Oliveira [EMAIL PROTECTED] wrote: I start using the MultiKeyMap in a application of mine, including the serialization of the maps. Since then, this application grew very much in heap usage, and after profiling the application, I see that the main offender is the AbstracHashedMap class as stated bellow: rank self accum bytes objs bytes objs trace name 1 63.92% 63.92% 1344801924 134480192 4 305914 org.apache.commons.collections.map.AbstractHashedMap$HashEntry[] 2 31.93% 95.85% 67180256 74 6724580875 305860 org.apache.commons.collections.map.AbstractHashedMap$HashEntry[] 3 0.69% 96.53% 1447176 49316 1449480 49395 305471 char[] 4 0.56% 97.10% 1183584 49316 1185480 49395 305470 java.lang.String 5 0.50% 97.60% 1053032 279 2693600 656 302432 byte[] (continues...) After some debug, I realized the cause is the following: In the method AbstractHashMap#doReadObject, the method call threshold = calculateThreshold(data.length, loadFactor); is after the put(key, value);. The put method uses the threshold to check the capacity of the data array. In this checking, the threshold is zero, leading to a resize of the data array. At each serialization/deserialization the size of the data array doubles. The question is: I'm missing something, or this is a bug in deserialization of the AbstractHashMap? Thanks in advance. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [commons-collections]: how to do reverse iteration in TreeBidiMap
There is no direct way to iterate over the 10 largest
values. However you can do the following:
TreeBidiMap map;
Object last = map.lastKey();
Object oneBefore = map.previousKey(last);
Object oneBeforeThat = map.previousKey(oneBefore);
Note that these are methods directly on TreeBidiMap.
The alternative is to use a reverse comparator.
BidiMap map;
Collection coll = map.values();
Set reversed = new HashSet(coll,
Collections.reverseOrder());
Stephen
--- rinke hoekstra [EMAIL PROTECTED] wrote:
Hi list,
maybe a stupid question, or maybe I am missing
something, but I cannot sort out how to
do a reverse iteration over the values of a
TreeBidiMap, and couldn't find much about it
on the web.
I want to retrieve the 10 greatest values from a
HashMap, and thought it best to use a
TreeBidiMap for it.
I have this:
TreeBidiMap bidiMap = new TreeBidiMap(myHashMap);
OrderedBidiMap invMap =
bidiMap.inverseOrderedBidiMap(); //creates inversed
map
OrderedMapIterator oit =
invMap.orderedMapIterator();
while (oit.hasPrevious()) {
Float value = (Float)oit.previous();
.
}
The iterator however seems to be initialized at the
first element, so hasPrevious() is
usually false, and the loop isn't run.
How to initialize the iterator at the last element,
so you can start iterating using
hasPrevious()?
-
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Re: [jxpath] regular expressions in XSLT string operations
Apologies in advance for MY brevity: - Read the mailing list guidelines. - Add [jxpath] to the subject. - Remember that we don't get paid for this. - Generally, if you want it, you may have to help do it. Stephen depub2 wrote: Apologies in advance for my brevity: I did not ask for a workaround - I know workarounds exist. I ASKED: Is there a PLAN for commons/jx-path to support at least some of the XPATH 2.0 features such as regex (fn:matches, fn:replaces, fn:tokenize) and other really helpful string operations? IS THERE A PLAN? IS THERE A ROUGH DATE OF COMPLETION? This planning information will help me determine if I should put a work-around in place. Thank You, David Hi David, I'm just a JXPath user. Maybe you could implement fn:replaces, fn:matches and fn:tokenize as custom functions in JXPath. Check out http://jakarta.apache.org/commons/jxpath/users-guide.html#Custom%20Extension %20Functions Cheers, Adrian P.J. depub2 wrote: fn:replaces provides for regular expression based string match/substitution within xslt. Is there a plan for commons/jx-path to support at least some of the XPATH 2.0 features such as regex (fn:matches, fn:replaces, fn:tokenize) and other really helpful string operations? I am using cocoon and could *really* use these string functions! David Best Regards, David E. Epperly Engineering Services Inflection Technologies Corp. Tel#: (310) 523-2817 Cel#: (310) 780-2817 Fax#: (310) 329-0781 IWeb: http://www.inflectech.com Mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Math] [Collections] time-based window statistics
- Original Message - From: Paul Smith [EMAIL PROTECTED] We have the need to track things in a data-rate format, like indexes operations/second etc and stats similar to what is reported via the 'uptime' command, with averages over a 1 minute, 5 minute, 15 minutes etc. Now I'm sure creating my own little API is not that hard, but it occured to me that this or something similar has to have been done so many times that someone has released a utility API to help. There doesn't appear to be any window-style collections in Jakarta Collections, and the DescriptiveStats class in Math is very useful, but there's nothing natively in there to do with time-based windows. The closest I can come to help you is with Joda-Time http://joda-time.sourceforge.net. We have an Interval class with a contains method that would be useful in identifying whether an event was in a particular interval or not. We don't have any collections though. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Collections] What collection fits my problem?
You describe the correct behaviour of SortedBag, and collections in general.
Most collections use .equals() comparisons.
You have two choices:
a) Write a sorted collection that uses == for comparison instead of .equals
b) Use a TreeSet, but wrap each of your objects in an inner class style
wrapper, eg:
public class Wrapper {
public Object realData;
}
Stephen
- Original Message -
From: Mike Zatko [EMAIL PROTECTED]
FYI, I did try a sorted bag which appeared to be what I was looking for.
But, for some reason if you add 2 identical objects (deep copied) and add
them to the bag, it will merely overwrites the first objects reference
with the second objects reference. To me, this seems like it would be a
bug, but I could be wrong. Any thoughts?
Mike Zatko wrote:
I need a sorted collection that also allows deep copied duplicate objects
(exact same object, different memory addresses). Is there a collection
that fits that requirement? I've been having difficulty finding one
myself. Thanks for any help.
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Re: [IO] Commons IO 1.1RC1 ?
Code-wise its pretty close. But I'm not sure if we have a release manager who wants to push it through. So, if I gave you a date I might just disappoint you ;-) Stephen - Original Message - From: Lukas Bradley [EMAIL PROTECTED] Is there a release date set for 1.1 RC1 or Final? The API as shown on http://jakarta.apache.org/commons/io/apidocs/index.html is the 1.1-dev version. Some users (such as myself) might browse it for needed functionality, find what they are looking for, but not notice it is missing from the 1.0 version. In short, when will a release candidate be available? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [lang] Bugs of StringEscapeUtils.escapeHtml()?
Is that a problem? Stephen - Original Message - From: Carfield Yim [EMAIL PROTECTED] Other than escapeHTML entities like space and , all multibyte Characters like Chinese, Japanese and Russian will escaped. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: camel case string
Don't misunderstand me. I'd like the code to be attached to the bugzilla call too, plus tests. Stephen From: Henry Voyer [EMAIL PROTECTED] Sorry but i beleive that this is not the way to go. This is an easy programming task. He could take 30 minutes to program it, do a junit and deliver the result to the community. A+ -Original Message- From: Stephen Colebourne [mailto:[EMAIL PROTECTED] Sent: Monday, March 07, 2005 8:00 PM To: Jakarta Commons Users List Subject: Re: camel case string I would recommend raising a bugzilla call (RFE) against [lang]. This suggestion has come up before. Stephen - Original Message - From: Anthony Perritano [EMAIL PROTECTED] is there api to split camel case strings into separate words? for example i want the ability to split stepListFirst into step List First. Thanks, Anthony Perritano - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: camel case string
I would recommend raising a bugzilla call (RFE) against [lang]. This suggestion has come up before. Stephen - Original Message - From: Anthony Perritano [EMAIL PROTECTED] is there api to split camel case strings into separate words? for example i want the ability to split stepListFirst into step List First. Thanks, Anthony Perritano - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Transition to Generics
See the http://collections15.sourceforge.net project Stephen - Original Message - From: Simon Kitching [EMAIL PROTECTED] To: Jakarta Commons Users List commons-user@jakarta.apache.org Sent: Tuesday, February 22, 2005 8:56 PM Subject: Re: [collections] Transition to Generics On Mon, 2005-02-21 at 20:46 -0800, Mark Fairchild wrote: I'm curious if there are any plans as to when and how commons-collections will begin to leverage features from Java 1.5, such as generics and typesafe enums. Is this underway in an experimental branch? Are volunteers needed to work on such thing? And if not, is there a timeframe for when the transition will start? This has been discussed here before. The current state appears to be that a few people are interested in working on this, but none of them are commons committers. And that makes it difficult to work on this within the commons project. It has been suggested that those people interested could work initially on sourceforge. See the mail archives for more info... Regards, Simon - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] MultiHashIdentityMap ?
There has been demand before for MultiHashMap to extend AbstractMapDecorator. I support the concept of MultiMaps produced by decoration, however we cannot change the existing MultiHashMap class. Should you, or anyone else, implement a MultiMap based on AbstractMapDecorator, with test cases, attached to a bugzilla call, then I would like to add it to [collections]. Stephen - Original Message - From: paul womack [EMAIL PROTECTED] I *really* like the MultiMap concept; I have many uses for it within my app. However, I have quite a lot of well defined pools of objects. These are often used as keys to java.util.Maps; since I *KNOW* I'm OK, I use java.util.IdentityMaps for performance reasons. I would very much like to have the same option with MultiHashMap. MultiHashMap is already carefully designed to allow the underlying multi-ness to be implmented by the Collection of my choice, by over-riding createCollection(); However, MultiHashMap extends HashMap, which means my request is no trivial to implement. If (I suggest :-) it extended AbstractMapDecorator, the underlying Map could be similarly versatile. BugBear - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: FastMultiHashMap, BidiMultiHashMap
From: [EMAIL PROTECTED] This probably rather belongs to the developer's mailing list but is there any particular reason why there is no FastMultiHashMap because the Fast* classes are in general thought to be of dubious value due to the double checked locking problem, see comments in the class and no BidiMultiHashMap? because writing Bidi maps is fiendishly complicated, and there are many other possible bidi maps that _coul_ be created (thus only the simple basic ones are provided) Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [io] Should I buffered streams when using commons io?
The javadoc tells you the answer The copy methods use an internal buffer when copying. It is therefore advisable not to deliberately wrap the stream arguments to the copy methods in Buffered* streams Stephen - Original Message - From: Carfield Yim [EMAIL PROTECTED] To: Jakarta Commons Users List commons-user@jakarta.apache.org Sent: Wednesday, February 09, 2005 2:16 PM Subject: Should I buffered streams when using commons io? Should I buffered streams when using commons io myself, like CopyUtils.copy(new BufferedInputStream(new FileInputStream(file)), new BufferedOutputStream(res.getOutputStream())); instead of CopyUtils.copy(new FileInputStream(file)), res.getOutputStream()); Or CopyUtil, IOUtil proper probably inside the API? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: count/delete/contains elements of collection using iterator,
[collections] generally deals with iterators by asking you to convert them to a collection, for which we provide a method. Have a scan of CollectionUtils to see if that helps. Stephen - Original Message - From: Peter Billen [EMAIL PROTECTED] I was wondering if there are functions to count in a collection using the iterator, checking if an element is contained in a collection using the iterator, deleting etc. I know these are simple while-loops, but I was wondering if they were already avaiable in the library. I couldn't find anything in the API docs. thanks, -- Peter - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [dbcp][pool] Bug or incompatibility?
org/apache/commons/collections/CursorableLinkedList was deprecated in collections 3.0/3.1 but still exists, so you shouldn't get a NoClassDefFoundError. Hopefully the dbcp/pool developers can comment more about the dependency. Stephen - Original Message - From: Stefan Burkard [EMAIL PROTECTED] i just started an eclipse-project in which i use commons-dbcp, and pool to establish a db-connection-pool. by the way i use jTDS as driver for mssqlserver. if i run my code i get a java.lang.NoClassDefFoundError: org/apache/commons/collections/CursorableLinkedList when i add the actual commons-collections-3.1 to my lib-dir i get the same error. if i take the collections-jar from tomcat 5, the error is gone. 1. question: is collections needed to work with dbcp and pool? 2. question: is the above a bug or an incompatibility? greetings stefan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [lang] lang.Validate
Thanks for the response. Where is the proper place to discuss such a proposal? The commons-dev list? Yes, for proposed code changes commons-dev is better. commons-user is for usage queries. Stephen - Original Message - From: Briniest Mark [EMAIL PROTECTED] To: Jakarta Commons Users List commons-user@jakarta.apache.org Sent: Friday, January 21, 2005 2:32 AM Subject: Re: [lang] lang.Validate - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [lang] lang.Validate
The Validate class is intended to be used to validate entry to methods at runtime, similar to the assert keyword in JDK1.4. It is not intended to be a general purpose validation class. What I'm wondering is, are there are any plans to increase the scope of Validate's tests? And if there aren't any such plans, would the maintainers be open to someone else (me, for example) submitting patches that expand the functionality of Validate? There are no plans at present. Specific ideas are welcomed, as are patches. Patches should be submitted to bugzilla with test cases using the correct patch format (see pages on website) I can think of quite a few tests that could be standardized by Validate. For example: A regex matching test; Validate.matches(param, [1-9][0-9]*); A numerical range test; Validate.inRange(param, new IntRange(0, null)); A test for asserting a predicate over an array collection: Validate.forAll(myList, myPredicate); Even a simple nonNegative test for the integral and floating point primitives would be great. Any enhancement suggestions will be judged based on whether they fit the intent of the class, and whether they are JDK1.2 compatible (regexp isn't for example). Of your suggestions, I believe that numeric range validations could probably be added, but regexp and predicate based classes would not. I also suggest discussing particular proposals before going to the effort of implementation. Hope this helps. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: commons functors project status
The lead developer Rodney Waldorf has rather disappeared from the commons list, thusthe project never proceeded to a release. I would not incorporate this code in [collections] as collections is already at about its maximum viable size. Stephen - Original Message - From: Brian Lee [EMAIL PROTECTED] Is the commons functors project dead? If not, will this project and the commons collection project combine / collaborate? Brian - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: ToStringBuilder : print only first elements of array
Create a new subclass of ToStringStyle and override the method protected void appendDetail(StringBuffer buffer, String fieldName, Object[] array) Stephen - Original Message - From: [EMAIL PROTECTED] To: commons-user@jakarta.apache.org Sent: Tuesday, December 21, 2004 3:48 PM Subject: ToStringBuilder : print only first elements of array Hi, I use ToStringBuilder to print arrays but sometime these arrays have hundreds of elements, so the log file becomes unreadable I would like to print only the first 5 elements Is it possible with ToStringBuilder ? Thanks This message and any attachments (the message) is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. - Ce message et toutes les pieces jointes (ci-apres le message) sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, BNP PARIBAS (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: AW: [collections] Modify getter result
What you realy need is a DefaultedMap class. I have
most of one coded on my PC, but I never seem to have
the time to commit it. (I also had questions as to
whether to make it a flag on LazyMap, or a new class.)
Anyway, for now, if LazyMap is not good enough, then
you will need to write your own class, it is simplest
to just copy LazyMap and remove the line that adds to
the map.
Stephen
--- Nentwig, Timo [EMAIL PROTECTED] wrote:
When the get(Object) method is called with a key
that does not exist in the map, the factory is used
to create the object. The created object will be
added to the map using the requested key.
Well, this would do the trick but isn't quite what I
am looking it though.
After calling
currency.get(AB);
currency.get(BC);
I would have two new item in the HashMap, AB and BC.
Consider this:
Factory factory = new Factory() {
public Object create() {
LOG.error(non-existing object was requested at
+ System.currentTimeMillis());
return new Date();
}
}
Map lazy = Lazy.map(new HashMap(), factory);
Object obj = lazy.get(AB);
wait();
Object obj2 = lazy.get(BC);
wait();
Object obj = lazy.get(AB);
Getting AB the second time would actually return the
object created in first instance. Consider that the
Map may likely be filled by data from a persistence
store which likely must be updated manually and
cannot or must not be done in create().
-Ursprüngliche Nachricht-
Von: Stephen Colebourne
[mailto:[EMAIL PROTECTED]
Gesendet: Montag, 20. Dezember 2004 21:17
An: Jakarta Commons Users List
Betreff: Re: [collections] Modify getter result
See LazyMap.
Stephen
- Original Message -
From: Nentwig, Timo [EMAIL PROTECTED] I'm
not sure whether this can be done with
commons-collections.
I need to hook in a collection and return a default
value when the requested key does not exist in the
collection. E.g.
Map currency = new HashMap()
{
{
put(DE, EUR);
put(US, USD);
}
};
And currency.get(XY) is supposed to return a
default value (this may require additional logic and
e.g. may write to the logger that an yet unsupported
ISOCODE was requested).
Can this be done?
Kind regards
Timo
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Re: [OT] Request an app test (free beer!)
Maybe a google search would serve your needs:
http://lopica.sourceforge.net/os.html
Stephen
--- Ben Souther [EMAIL PROTECTED] wrote:
FC2 returns:
Linux
On Tue, 2004-12-21 at 09:11, Jason Vinson wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
$ java Test
Mac OS X
For OSX obviously :)
Jason
Frank W. Zammetti wrote:
| I was informed last OT post I made that the
subject should always
| include the word beer. I added the free to
get your attention
| :)
|
| I'm working on something for which I need to
know what the os.name
| property on various OS's is. I would greatly
appreciate it if
| some folks could try the following:
|
| public class test { public static void
main(String[] args) {
|
System.out.println(System.getProperty(os.name)); }
}
|
| I'm particularly interested in various *nix
variants, Linux, Mac
| and such. Windows I already have answers for
(although some
| verification to be sure nothing fishy is going
on wouldn't hurt).
|
| If you could just post your OS and what the
result was, I would
| greatly appreciate it. Thanks in advance!
|
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.2.4 (GNU/Linux)
Comment: Using GnuPG with Thunderbird -
http://enigmail.mozdev.org
iD8DBQFByC8gAQ71cZOfvEQRAvmTAJsH/HPRTrDYR+XgByCuEbaPvZq11gCghhN0
Ic+qTea8RWeWoeKBw4wNepU=
=dtlR
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Re: [collections] Modify getter result
See LazyMap.
Stephen
- Original Message -
From: Nentwig, Timo [EMAIL PROTECTED]
I'm not sure whether this can be done with commons-collections.
I need to hook in a collection and return a default value when the
requested key does not exist in the collection. E.g.
Map currency = new HashMap()
{
{
put(DE, EUR);
put(US, USD);
}
};
And currency.get(XY) is supposed to return a default value (this may
require additional logic and e.g. may write to the logger that an yet
unsupported ISOCODE was requested).
Can this be done?
Kind regards
Timo
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Re: about LRUMap usage...
This MAY be due to the treeMap.put(). You are not
allowed to change a map object while you are iterating
over it except via the setValue() method on the
iterator.
Stephen
--- Alp Şehiç [EMAIL PROTECTED] wrote:
Hi there,
at the time I'm facing with a problem on the usage
of LRUMap, so in the
code below;
final MapIterator mapIt = map.mapIterator(); // map
is a LRUMap instance...
final TreeMap treeMap = new TreeMap();
while (mapIt.hasNext())
{
if
(mapIt.next().toString().endsWith(_DEPARTMENT_NAME))
// EXCEPTION IS
THROWN RIGHT HERE...
{
int temp =
Integer.parseInt(
mapIt.getKey().toString().substring(0, 4));
if (temp = getFirstNo() temp
= getLastNo())
{
treeMap.put(mapIt.getKey(),
mapIt.getValue());
}
}
}
I'm getting :
java.lang.ExceptionInInitializerError:
java.util.ConcurrentModificationException
at
org.apache.commons.collections.map.AbstractLinkedMap$LinkIterator.nextEntry(AbstractLinkedMap.java:555)
at
org.apache.commons.collections.map.AbstractLinkedMap$LinkMapIterator.next(AbstractLinkedMap.java:367)
at Support.initParameters(Support.java:486)
at Support.clinit(Support.java:72)
at Store..clinit(Magaza.java:52)
so is there something wrong with my usage ?
thanx in advance...
-
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Re: Iterator problems collections
I can't see anything wrong with what you've sent, but I don't have the
complete code. I suggest you break your task down into parts and check
whether you really are converting the objects, or whether perhaps you are
converting them at the wrong time in your logic.
Stephen
- Original Message -
From: Jörg Herbst [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, December 10, 2004 6:05 PM
Subject: Iterator problems collections
Hi folks,
I've got a problem with the CollecionUtils.filter method and
the Iterator wrappers. I've written a custom Collections class
which stores a tree data structure (based on DefaultMutableTreenode).
I want to hide the implementation (the usage of
DefaultMutableTreeNode) and provided an iterator() methods which
should return my user objects:
/**
* Gets an iterator with all user objects
*/
public Iterator iterator() {
Iterator it = new EnumerationIterator(
root.breadthFirstEnumeration(),this);
Iterator tranformedIt =
IteratorUtils.transformedIterator(it,
new TreeNodeToUserObjectTransformer());
return tranformedIt;
}
/**
* Internal Transformer class for converting a TreeNode
* to it's user object
*/
private class TreeNodeToUserObjectTransformer implements Transformer {
public Object transform(Object o) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) o;
return node.getUserObject();
}
}
Now I'm calling CollectionUtils.filter(myCollection,myPredicate)
and suspected to get my user objects passed to the removed(Object o)
method. But instead of getting the userObjects, I get
DefaultMutableTreeNOdes. Can anybody tell me what I'm doing wrong?
Thx
Joerg
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Re: NPE: map.LRUMap.reuseMapping(LRUMap.java:272)
This looks like a bug. Could you please add it to bugzilla. It would help greatly, and speed a fix, if you can identify a small test case that causes the problem. Thanks Stephen --- [EMAIL PROTECTED] wrote: Hello, I'm using Collections 3.1 and just found this NPE in my logs: java.lang.NullPointerException at org.apache.commons.collections.map.LRUMap.reuseMapping(LRUMap.java:272) at org.apache.commons.collections.map.LRUMap.addMapping(LRUMap.java:243) at org.apache.commons.collections.map.AbstractHashedMap.put(AbstractHashedMap.java:282) This looks like a bug. Is this a known issue? I instantiated LRUMap like this: LRUMap map = new LRUMap(31); And from there on, I use it like I'd use any Map, putting things into it, and so on. Maybe I'm not using LRUMap correctly? My _guess_ is that this occurs when the Map is full, but I am not certain. I am wrapping the LRUMap in my own Maps as follows, but I think they're not the culprit: LRUMap map = new LRUMap(31); _userSessions = new ExpiringMap(map, new TimerTTLReferenceHolder(180), // ttl=30min 30); // purge frequency=5min I checked Bugzilla and I checked the CVS log for LRUMap, but I don't see any mentions of relevant bug fixes. The only similar thing I found is: http://issues.apache.org/bugzilla/show_bug.cgi?id=28887 And it looks like that was fixed before 3.1 release. I'm seeing this error in production ( http://www.simpy.com ), so any help would be mucho appreciated. Thanks, Otis P.S. If it helps, I can put this in Bugzilla. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [primitives] what would it take for a 1.1 release?
I believe it just needs someone with the time and will to make the release ;-) Stephen - Original Message - From: Alex Karasulu [EMAIL PROTECTED] Hi, Everything in primitives looks really good to me and its been sitting there at 1.1-dev for a while now. Wondering what others are thinking about releasing primitives 1.1? Alex - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [primitives] what would it take for a 1.1 release?
There is only Bugzilla, I know no more! Stephen - Original Message - From: Alex Karasulu [EMAIL PROTECTED] To: Jakarta Commons Users List [EMAIL PROTECTED] Sent: Tuesday, December 07, 2004 9:29 PM Subject: Re: [primitives] what would it take for a 1.1 release? Stephen Colebourne wrote: I believe it just needs someone with the time and will to make the release ;-) Stephen, I just want to estimate the amount of energy need to push it through. Can you provide a list of items you think need to be fullfilled? If the work is not that much then I can commit to pushing 1.1 to a release. Alex Stephen - Original Message - From: Alex Karasulu [EMAIL PROTECTED] Hi, Everything in primitives looks really good to me and its been sitting there at 1.1-dev for a while now. Wondering what others are thinking about releasing primitives 1.1? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] plans to make PriorityBuffer serializable?
I currently have no plans to make PrioityBuffer serializable. However, if a patch were added to Bugzilla, with the serializable test handling added then it would stand a fair chance of being done ;-) Stephen - Original Message - From: Steve Phelps [EMAIL PROTECTED] Are there any plans to make the collections.buffer.PriorityBuffer class implement the java.io.Serializable interface in the next release of the Jakarta commons collections package? (Apologies if this has been answered before; the archives are down at the moment but a google search did not yield anything). - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [Clazz] Is anybody maintaining this?
There are no current maintainers of [clazz]. It was partly my idea, but was mainly implemented by another. The reality is that I don't have the time to be able to focus on this project :-( Stephen - Original Message - From: Ihab Awad [EMAIL PROTECTED] I posted a question re commons Clazz a while ago and got no reply. Is anyone working on this? It sure seems like a worthwhile project The question was whether there are plans for adding multiple inheritance support to Clazz-es, or whether that's a Bad Idea [TM]. Multiple inheritance would be great for stuff like modeling Bean property patterns and method signatures that are declared in Java interfaces. Thanks a lot peace, Ihab - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] LinkedMap and ListOrderedMap
Both are provided to give you a choice of implementation. IIRC, ListOrderedMap allows you to get a List object of keys, and also allows you to choose your Map implementation (if you want something unusual).. To choose, the best answer is to performance test both in your application. Bear in mind, the JDK implementation is like LinkedMap, so that might suggest that is the better choice. Stephen - Original Message - From: Koji Sekiguchi [EMAIL PROTECTED] These classes resemble each other, don't they? Are there any explanation/condition for choosing one of them whan I use ordered map in my application? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: commons compress question
- Original Message - From: Laat, Harm de [EMAIL PROTECTED] I pulled compress out of the CVS tree and created a jar. I found some test files in the CVS source. But I don't see a simple zip / unzip example there. Is there something like that available? commons compress has a current status of classes unreleased and without community. AFAIN, there are no examples available. Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Point based map
Unfortunately this implementation would be unsuitable for [collections], primarily on the grounds of it being very specific to the Point and Rectangle classes. Stephen - Original Message - From: Simone Pierazzini [EMAIL PROTECTED] I looked for a Java quad-tree implementation but I didn't find any free (ie. open source) or compatible with the JDK Collections Framework. So I decided to develop one myself. I've developed a Map extension: this Map is a specialized version whose keys are Point (java.awt.Point). Basically it is a standard Map that contains an extra method to retrieve all entries contained in a Rectangle passed as a parameter to the method: The Syntax for the new Method is: Iterator get (Rectangle r); I've developed a quad-tree based implementation, and a junit test case (not completed yet). My question is: are you interested in including these classes in commons-collections? thanks, Simone Pierazzini - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [commons-io] CopyUtils
commons-io does not have another method for the task you describe. At present I would say that commons-io would recommend that in truly performance/scalability critical tasks it would be adbisable to code your own io code for this kind of task. Stephen - Original Message - From: Robert Taylor [EMAIL PROTECTED] Greetings, I would like to use CopyUtils.copy(InputStream is, OutpuStream os) to manually server (read from input stream and write to output stream) up large binary files to web clients (browsers). After reading the documentation which indicates it does not flush the buffer in the method, I'm concerned that this would result in OutOfMemoryErrors under large loads. I was under the assumption that it would be prudent to flush the buffer after a certain number of reads to reduce the amount of resident memory used. Is there a another utility to perform such a common task? robert - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: ApacheCon talks
If there is more than 1 hours material, perhaps split the talks into two1 hours by the narrow interface/broad interface categorisation. ie. Collections/Lang/Codec/IO/... have broad shallow API Betwixt/JXPath/Digester/... have narrow deep API That way you could include the sandbox ones with the relevant group. There still may not be enough material though. Stephen - Original Message - From: Eric Pugh [EMAIL PROTECTED] I agree w/ the 3 hour thing.. to be honest, I don't think I can keep my interest up in anything for 3 hours unless there is a handson component.. I agree though that raising the visibility of commons would be nice.. Often people don't know about all the great libraries available and how they can help them! Eric -Original Message- From: Torsten Curdt [mailto:[EMAIL PROTECTED] Sent: Friday, July 09, 2004 8:14 AM To: Jakarta Commons Users List Subject: Re: ApacheCon talks Henri, I'm pondering the idea of giving one/two talks at the ApacheCon in November. Not sure how many people a talk about the sandbox would attract ...but IMO commons would be a good thing to talk about. Actually I thought about submitting a proposal myself. But IMHO 3 hours (wow!) is way to much ...I know there is much to talk about - but I doubt you can keep people interested in a set of libraries for more than an hour. My 2 cents cheers -- Torsten - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [math] Eliminating [lang] dependency
I disagree, use getCause(). Users should see the class as similar to the JDK
as much as possible.
See
http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/org/ap
ache/commons/collections/FunctorException.html
http://cvs.apache.org/viewcvs.cgi/jakarta-commons/collections/src/java/org/a
pache/commons/collections/FunctorException.java?rev=1.6view=auto
Stephen
- Original Message -
From: Henri Yandell [EMAIL PROTECTED]
Is using the same name as Throwable for getCause() wise?
Won't this lead to times when you can compile on 1.3, and the code won't
run on 1.4? (unsure, but it seems likely to me).
I'd suggest getThrowable as with Lang. You know it's supported by the
reflection Utils in Lang if someone puts them together, and it keeps
things standard.
Hen
On Fri, 9 Jul 2004, Mark R. Diggory wrote:
I suspect that would just look like this, is this adequate for our
needs?
-Mark
/**
* A generic exception indicating problems in the math package.
* @version $Revision: 1.16 $ $Date: 2004/06/02 00:05:28 $
*/
public class MathException extends Exception implements Serializable {
/** Serializable version identifier */
static final long serialVersionUID = -8594613561393443827L;
private Throwable cause = null;
/**
* Constructs a MathException
*/
public MathException() {
super();
}
/**
* Create an exception with a given error message.
* @param message message describing the problem
*/
public MathException(final String message) {
super(message);
}
/**
* Create an exception with a given error message and root cause.
* @param message message describing the problem
* @param throwable caught exception causing this problem
*/
public MathException(final String message, final Throwable
throwable) {
super(message, throwable);
this.cause = throwable;
}
/**
* Create an exception with a given root cause.
* @param throwable caught exception causing this problem
*/
public MathException(final Throwable throwable) {
super();
this.cause = throwable;
}
/* (non-Javadoc)
* @see java.lang.Throwable#getCause()
*/
public Throwable getCause() {
return cause;
}
/* (non-Javadoc)
* @see java.lang.Throwable#printStackTrace()
*/
public void printStackTrace() {
super.printStackTrace();
if(cause != null)
cause.printStackTrace();
}
/* (non-Javadoc)
* @see java.lang.Throwable#printStackTrace(java.io.PrintStream)
*/
public void printStackTrace(PrintStream s) {
super.printStackTrace(s);
if(cause != null){
s.print(\n\nCaused By:\n\n);
cause.printStackTrace(s);
}
}
/* (non-Javadoc)
* @see java.lang.Throwable#printStackTrace(java.io.PrintWriter)
*/
public void printStackTrace(PrintWriter s) {
super.printStackTrace(s);
if(cause != null){
s.print(\n\nCaused By:\n\n);
cause.printStackTrace(s);
}
}
}
Henri Yandell wrote:
Seems to me that all you need is to add a getParentException method to
your Exception and Throwable to your constructors. Unsure just how
much
you're inlining.
Doing all the stuff Lang's exception stuff does seems unnecessary for
Math. Probably nothing new in this opinion :)
Hen
On Thu, 8 Jul 2004, Phil Steitz wrote:
I agree with both of you. The patch (though more testing has shown it
is bugged) tries to bake all functionality of NestableException into
MathException. It includes code from NestableDelegate and
ExceptionUtils as well as NestableException. The simplest would be to
copy and rename all of these classes, but I agree with Stephen's
suggestion that it would be better to just borrow (er... I mean steal)
the implementation code. The practical question is do we really need
all of the functionality in the o.a.c.l.e.Nestable interface? I am
travelling now, but when I get back this weekend if there are no
objections I will commit a fixed version with more and better test
cases
and we can decide what, if anything, we can drop.
Phil
-Original Message-
From: J.Pietschmann [mailto:[EMAIL PROTECTED]
Sent: Thu 7/8/2004 3:19 AM
To: Jakarta Commons Users List
Cc:
Subject: Re: [math] Eliminating [lang] dependency
Mark R. Diggory wrote:
The only other alternative I can think of that may make things
easier if
anything changes in the future would be to just copy
NestableException
into the math package hierarchy under something like
Re: [Collections] Add Object to Collection if not null
I quite like this idea, as it is simple and does cover a case I can see
people finding.
It might be worth opening a bugzilla entry for it so it is kept track of.
Stephen
- Original Message -
From: Rafael U. C. Afonso [EMAIL PROTECTED]
I was looking for a method that adds a object in a Collection
if this object is not null, but I did not find it in
Collections. I thought that this method would be useful in
CollectionUtils class. Is there a method like this? If it
does not exist I would like suggest this. It could be
implemented like this:
public static boolean addNotNull(Collection c, Object o) {
return (o != null)? c.add(o): false;
}
Like Collection.add(Object) returns boolean, this method will
boolean too.
What is your opinion?
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[ANNOUNCEMENT] Commons Collections 3.1 released
The Commons Collections team is pleased to announce the release of Commons Collections 3.1. Commons Collections provides additional interfaces and implementations based on, and inspired by, the Java Collections Framework (Collection, List, Set, Map). This release fixes a number of bugs in v3.0 and is fully compatible. Release v3.1 is also compatible with v2.1.1 enabling a workaround of previous compatability issues in IteratorUtils. In addition to bug fixes, this release adds various new features including: * TreeList - A new list implementation that is faster than ArrayList in certain use cases * MultiKeyMap - A dedicated map implementation to support combined keys mapping to a value * ReferenceIdentityMap - An identity based map whose keys/values can be garbage collected * Many more Serializable classes Read the Release notes: http://www.apache.org/dist/jakarta/commons/collections/RELEASE-NOTES.html Download the binary distribution: http://jakarta.apache.org/site/binindex.cgi#commons-collections Download the source distribution: http://jakarta.apache.org/site/sourceindex.cgi#commons-collections Browse the collections website: http://jakarta.apache.org/commons/collections/index.html Please direct any feedback on issues or bugs to [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[ANOUNCEMENT] Commons Collections 3.1-RC1 and 2.1.1 released
The Commons Collections team announces the release of Commons Collections 3.1-RC1. This is a preview of v3.1 to enable users to test the release against their own code. We advise waiting for the formal 3.1 release before putting the code into production. Please direct any feedback on issues or bugs to [EMAIL PROTECTED] Read the release notes - http://www.apache.org/~scolebourne/coll31/RELEASE-NOTES.html Download the distribution - http://www.apache.org/~scolebourne/coll31/ The Commons Collections team also announces the release of Commons Collections 2.1.1. This is a patch release to v2.1 to enable a workaround of issues in IteratorUtils v3.0. If you are still using v2.1 please upgrade to v2.1.1, especially if you run an Open Source project. See the release notes for full details of the patch and why it was produced. Read the release notes - http://www.apache.org/dist/jakarta/commons/collections/RELEASE-NOTES-2.1.1.h tml Download the binary distribution - http://jakarta.apache.org/site/binindex.cgi#commons-collections Download the source distribution - http://jakarta.apache.org/site/sourceindex.cgi#commons-collections Stephen Colebourne http://jakarta.apache.org/commons/collections/index.html - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[collections] To all collections users, version 3.1 compatibility
Collections 3.1 is currently under development. At present there are two binary incompatible changes proposed relative to 3.0. This mail is to advertise these changes and give people a chance to complain ;-) 1) ReferenceMap (map package) now extends AbstractReferenceMap and AbstractHashedMap whereas previously it extended AbstractMap. This was done to gain lots of new functionality. This is binary incompatible if you previously cast a ReferenceMap to an AbstractMap. I can think of no good reason why you would have made this cast, but does anyone out there have an objection? 2) FixedSizeSortedMap now extends FixedSizeMap whereas previously it extended AbstractSortedMapDecorator. This was done to share more code. This is binary incompatible if you previously cast a FixedSizeSortedMap to an AbstractSortedMapDecorator. I can think of no good reason why you would have made this cast, but does anyone out there have an objection? Stephen - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [io] have I found a bug? should I tell to anyone?
Yes, write the junit test to prove the problem, then solve it if you can (take advice from the mailing list if not), finally post patches to bugzilla (use cvs diff -u format). Stephen - Original Message - From: Jörg Schaible [EMAIL PROTECTED] Hi, I suspect I met a bug in org.apache.commons.io.FileUtils: what should I do? (3) *- AND should I go to the bugs tracking apps in apache.org? (1) *- AND should I write a junit class showing the point? (2) *- AND else write a patch? *- or instead keep it for myself? Please tell me ASAP. In the order above. -- Jörg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] Array based int keyed map
At the moment, I would say that this is a specialised collection, presumably to solve a particular problem you have. As such it doesn't feel right for inclusion in [collections]. Stephen - Original Message - From: Joel Shellman [EMAIL PROTECTED] Stephen Colebourne wrote: A little confused ;-) Are you proposing a class that implements Map, or List, or Collection? The required operations are: int add(Object newObject); // Add new object to end of array or fill in a whole // Returns the new int key for it (which is the index // in the array) void set(int key, Object newObject); // Set the value at a specific index Object get(int key); // Return value at index So yeah, it doesn't fit List or Map. It is an int to Object Map, but looking at primitives, it doesn't appear to have anything like that in their currently. As for the advantage over ArrayList. ArrayList does not give you a lookup mechanism, which is the whole point of what I'm after. Let's say you add two items in an ArrayList. Even if kept track of which index they were at, if you removed the first one, the second one's index would change, so you can't use that. -joel shellman If its an int to Object Map, then [primitives] would be the place for it to go. If its a List, then the implementation you describe would violate the List interface. If its a Collection, then it might work, but I can't really see the advantage over an ArrayList style implementation. Stephen - Original Message - From: Joel Shellman [EMAIL PROTECTED] At least I think that describes it. Here's the application: I have a very large collection of objects that has an int key. Structural changes (add/remove) occur extremely seldom. Wouldn't it be useful to have a data structure such that accessing it by that key is simply an array lookup? myObject = myArray[key]; Removal support could be handled by setting that index to null and holding on to a stack of unused indexes. Adding new values use up the unused indexes before appending to the end. I have already written a simple initial implementation of this. I'm wondering: 1) Do others think this is generally useful? 2) Is this functionality already available in the commons-collections and I missed it? 3) Would it be useful to include this in commons-collections? Thank you, Joel Shellman - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [collections] collections size
Although I can't quite see the use case (simply casting to Collection would
give you an iterator...), adding a size(Object) method to CollectionUtils is
not unreasonable. To achieve this I would need a patch with unit tests
attached to a bugzilla entry ;-)
Stephen
- Original Message -
From: Melzer, Steven [EMAIL PROTECTED]
my reason for the code is because the IteratorUtils methods return iterators
of arbitrary objects and i really don't want the underlying collection. i
just want to set up some array sizes based on the list size, but i am not
going to perform any operation on the list itself, just iterate through it.
my specific example is an html table with an database resultset (returned as
a Collection) as its backing. i have a 'select all' button for the table.
i want to load an array with the selected items. i use the IteratorUtils
class to rip through a Collection that is the data to look for checked
items. so all i ever see is an iterator, i never get the collection itself,
and i don't need to either. but, if the 'select all' button is pressed, i
need to load the array with defaults for the entire size of the Collection.
i am not going to use the Collection, i just want to know how big it is so i
can create a loop and populate an array.
it is an obscure issue i agree, but i cannot see a reason not to support the
functionality either. if you rely on the IteratorUtil class for arbitrary
list iteration, you need something like this (and actually several other
Collection methods) to allow arbitrary lists to be as robust as a typical
Collection. it seems reasonable to add functionality to a common API even
for less common uses.
steve
-Original Message-
From: Janek Bogucki [mailto:[EMAIL PROTECTED]
Sent: Friday, March 19, 2004 6:21 PM
To: Jakarta Commons Users List
Subject: Re: [collections] collections size
On Fri, 2004-03-19 at 19:26, matthew.hawthorne wrote:
I understand the underlying idea behind your suggestion, but I don't
quite get the use case. Why create conditional llogic to get the size
of an arbitrary list, when you'd then have to implement the same
conditional logic to get the items out of the list?
If your goal is to treat all lists in a similar way, I think you'd be
better of doing something like:
public static Collection toCollection(Object list) {
if(list instanceof Collection)
return list
else if (list instanceof Map)
return ((Map)list).entrySet()
else
return Arrays.asList(list)
}
While I agree with the idea of using a Collection view of the object
when you want to do Collection things on the object, there is a
precedent for this sort of approach in o.a.c.collections in the form of
CollectionUtils.get(Object, int). This could be used to get the items
out of the 'list' although performance would suffer in some cases.
Edited JavaDoc:
Returns the index-th value in object.
Supports:
Map
List
Object Array
Collection
Iterator or Enumeration
public static Object get(Object object, int index)
-Janek
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Re: [collections] Iterator Exception behaviour
Fixed in CVS, and the upcoming 3.0 Stephen - Original Message - From: Janek Bogucki [EMAIL PROTECTED] To: Jakarta Commons Users List [EMAIL PROTECTED] Sent: Thursday, January 08, 2004 8:58 PM Subject: Re: [collections] Iterator Exception behaviour On Thu, 2004-01-08 at 10:36, pwomack wrote: I assert that the second version should be as equivalent as possible to this first; in short I believe that the Exception should not be thrown. BugBear I agree. -Janek - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Broken link to Commons API docs
This is a recuring problem :-( , we'll take a look. Thanks Stephen - Original Message - From: Wendy Smoak [EMAIL PROTECTED] On this page http://jakarta.apache.org/commons/collections/ There's a link to the API docs: http://jakarta.apache.org/commons/collections/collections/api/index.html The link is broken, it should be: http://jakarta.apache.org/commons/collections/api/index.html (only one /collections, not two). I know, I know... Open a bug, create a patch... -- Wendy Smoak Application Systems Analyst, Sr. ASU IA Information Resources Management - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
