On Wednesday 20 June 2001 12:54, Gerardo Arroyo wrote:
>>Hi!
>>
>>Every time that I attempt to build the last CVS lucene release I got a Java
>>Exception,
>>Any advice?
i had the same problem, after playing with it for a while, i gave up and just
did
make
which worked fine for me after some CLASSPATH munging. perhaps build.xml is
not up to date?
cheers
kapil
>>Note: the org.apache.tools.ant.taskdefs.optional.junit.JUnitTask doesn't
>>exist.
>>
>>
>>C:\lucene\build.xml:201: taskdef class org.apache.tools.ant.taskdefs.option
>>al.junit.JUnitTask cannot be found
>>--- Nested Exception ---
>>java.lang.ClassNotFoundException:
>>org.apache.tools.ant.taskdefs.optional.junit.J
>>UnitTask
>> at java.net.URLClassLoader$1.run(URLClassLoader.java, Compiled
>> Code) at java.lang.Exception.<init>(Exception.java, Compiled Code) at
>>java.lang.ClassNotFoundException.<init>(ClassNotFoundException.java,
>>Compiled Code)
>> at java.net.URLClassLoader$1.run(URLClassLoader.java, Compiled
>> Code) at java.security.AccessController.doPrivileged(Native Method) at
>> java.net.URLClassLoader.findClass(URLClassLoader.java, Compiled Code)
>>
>> at java.lang.ClassLoader.loadClass(ClassLoader.java, Compiled Code)
>> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java,
>>Compiled Co
>>de)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java, Compiled Code)
>> at org.apache.tools.ant.taskdefs.Taskdef.execute(Taskdef.java:111)
>> at
>>org.apache.tools.ant.ProjectHelper$TaskHandler.finished(ProjectHelper
>>.java:482)
>> at
>>org.apache.tools.ant.ProjectHelper$AbstractHandler.endElement(Project
>>Helper.java, Compiled Code)
>> at com.sun.xml.parser.Parser.maybeElement(Parser.java:1413)
>> at com.sun.xml.parser.Parser.content(Parser.java:1499)
>> at com.sun.xml.parser.Parser.maybeElement(Parser.java:1400)
>> at com.sun.xml.parser.Parser.parseInternal(Parser.java:492)
>> at com.sun.xml.parser.Parser.parse(Parser.java:284)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:155)
>> at org.apache.tools.ant.ProjectHelper.parse(ProjectHelper.java,
>>Compiled
>> Code)
>> at
>>org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.jav
>>a:85)
>> at org.apache.tools.ant.Main.runBuild(Main.java, Compiled Code)
>> at org.apache.tools.ant.Main.main(Main.java:149)
>>
>>-----Original Message-----
>>From: Doug Cutting [mailto:[EMAIL PROTECTED]]
>>Sent: Martes 5 de Junio de 2001 11:11 AM
>>To: 'Snyder, David'; '[EMAIL PROTECTED]'
>>Subject: RE: [Lucene-users] Question about search that returns a TopDocs
>>o bject...
>>
>>> From: Snyder, David [mailto:[EMAIL PROTECTED]]
>>>
>>> I've noticed that a search method with a new signature has
>>> been added to the
>>> Searcher and MultiSearcher classes since the 1.0 release... one that
>>> returns a TopDocs object and presumably only a limited number
>>> of results.
>>
>>This is used internally by Searcher.search(). Lucene only ever collects
>> the top documents. The Hits() object initially retrieves the top 100
>> documents. Attempts to access documents beyond this will result in
>> re-querying.
>>
>>Note in particular that a Document object is never read from the index
>> until Hits.doc(int) is called. Reading documents is slow. As a rule of
>> thumb, for high-performance search it should only be done for documents
>> which will be displayed.
>>
>>> I
>>> was getting ready to start experimenting with this method,
>>> but noticed is is
>>> not public, but protected. Is this intentional?
>>
>>Yes, to keep the public API simple. Calling these directly is not much
>> more efficient than accessing only the top results from a Hits object.
>>
>>If you want more explicit control, implement your own HitCollector and use
>>IndexSearcher.search(Query, HitCollector). Remember, an efficient
>>HitCollector must not read document objects, e.g., by calling
>> Searcher.doc() or IndexReader.document(), but should rather only use the
>> document number and its score. The default hit collector is an anonymous
>> class defined at line 75 of IndexSearcher.java.
>>
>>Perhaps it is worth making this collector public, as well as making TopDocs
>>and ScoreDoc public. Thoughts?
>>
>>It is trivial to construct hit collectors that only return the most recent
>>or oldest documents. Document numbers increase as documents are added, and
>>collectors are always called with increasing document numbers. So the
>>oldest 10 documents are always the first 10 passed to the collector, and
>> the oldest are always the last 10 passed to the collector.
>>
>> class OldestHits extends HitCollector {
>> private int[] hits;
>> private int hitCount = 0;
>> public OldestHits(int count) {
>> this.hits = new int[count];
>> }
>> public void collect(final int doc, final float score) {
>> if (hitCount < hits.length)
>> hits[++hitCount] = doc;
>> }
>> public Document[] hits(IndexReader reader) {
>> Document[] result = new Document[hitCount];
>> for (int i = 0; i < hitCount; i++) {
>> result[i] = reader.document(hits[i]);
>> }
>> return result;
>> }
>> }
>>
>> class NewestHits extends HitCollector {
>> private int[] hits;
>> private int hitCount = 0;
>> public NewestHits(int count) {
>> this.hits = new int[count];
>> }
>> public final void collect(final int doc, final float score) {
>> hits[++hitCount % hits.length] = doc;
>> }
>> public Document[] hits(IndexReader reader) {
>> int count = Math.min(hitCount, hits.length);
>> Document[] result = new Document[count];
>> for (int i = count-1; i >= 0; i--) {
>> result[i] = reader.document(hits[i]);
>> }
>> return result;
>> }
>> }
>>
>>Caveat Hackor: This code has not been tested!
>>
>>> We are using Lucene with very large indexes and I'm looking
>>> for ways to
>>> decrease the memory requirements when getting a large number
>>> of hits. Any
>>> suggestions?
>>
>>See above. Also, if you never need all of the document objects at once,
>>write a hit collector which returns hits as a raw array of integers and
>> only read the documents as you process them.
>>
>>Doug
>>
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