So i need to change this function to dateTime?,

NodeValue date = NodeValue.makeDate(lastModified);

is "make date"

On Fri, Aug 10, 2018 at 9:51 AM, Andy Seaborne <a...@apache.org> wrote:

>
>
> On 10/08/18 14:36, Arunkumar Krishnamoorthy wrote:
>
>> Even i don't know where that particular date is coming from. The dataset
>> is attached.
>>
>
> if it is not in the data and not in query, then it is in your code.
>
> What about URLConnection.getLastModifed?
>
> NB: You are in timezone +05:00 judging by ncsu.edu.
>
> 1969-12-31T19:00:00 +05:00
>
> is
>
> 1970-01-01T00:00:00
>
> which 0 in Unix time.
>
> >> SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
> Isn't a date, it's dateTime format.
>
> >>
> NodeValue date = NodeValue.makeDate(lastModified);
>
> is "make date"
>
>     Andy
>
>
>>
>> On Fri, Aug 10, 2018 at 3:57 AM, Andy Seaborne <a...@apache.org <mailto:
>> a...@apache.org>> wrote:
>>
>>     >> But i have given the type as xsd:dateTime, so it should take it
>> right?
>>
>>     The computer says otherwise.
>>
>>     >>myfn:LastModified(?r) >
>>     >> "2005-11-06T00:00:00Z"^^xsd:dateTime )
>>
>>       "2005-11-06T00:00:00Z"^^xsd:dateTime  is OK
>>
>>     >> "1969-12-31T19:00:00"^^xsd:date
>>
>>     Not OK. Find out where "1969-12-31T19:00:00" comes from. Is it in
>>     the data?
>>
>>          Andy
>>
>>
>>
>>
>>     On 10/08/18 06:53, Lorenz Buehmann wrote:
>>
>>         which type? in the function or in the data? both have to match,
>>         there is
>>         no implicit conversion I guess.
>>
>>
>>         On 09.08.2018 21:29, Arunkumar Krishnamoorthy wrote:
>>
>>             But i have given the type as xsd:dateTime, so it should take
>>             it right?
>>
>>             On Thu, Aug 9, 2018 at 3:24 PM, ajs6f <aj...@apache.org
>>             <mailto:aj...@apache.org>> wrote:
>>
>>                     13:44:11 WARN  NodeValue            :: Datatype
>>                     format exception:
>>                     "1969-12-31T19:00:00"^^xsd:date
>>
>>                 No, Jena is just telling you (quite correctly) that
>>                 "1969-12-31T19:00:00"
>>                 is not an xsd:date. Notice the time that is included.
>>                 xsd:date does not
>>                 include time.
>>
>>                 ajs6f
>>
>>                     On Aug 9, 2018, at 2:35 PM, Arunkumar Krishnamoorthy
>>                     <akris...@ncsu.edu <mailto:akris...@ncsu.edu>>
>>
>>                 wrote:
>>
>>                     Hello Andy,
>>
>>                     I am getting the below error when i run the query
>>                     against the dataset
>>                     shared with you,
>>
>>                     PREFIX myfn: <java:samplejena.>
>>                     PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#
>>                     <http://www.w3.org/2000/01/rdf-schema#>>
>>                     PREFIX dc: <http://purl.org/dc/elements/1.1/
>>                     <http://purl.org/dc/elements/1.1/>>
>>                     PREFIX xsd: <http://www.w3.org/2001/XMLSchema#
>>                     <http://www.w3.org/2001/XMLSchema#>>
>>                     SELECT ?title ?r
>>                     WHERE {
>>                     ?s rdfs:seeAlso ?r.
>>                     OPTIONAL {?r dc:title ?title.}
>>                     FILTER ( isURI(?r) &&
>>                     myfn:LastModified(?r) >
>>                     "2005-11-06T00:00:00Z"^^xsd:dateTime )
>>                     }
>>
>>                     13:44:11 WARN  NodeValue            :: Datatype
>>                     format exception:
>>                     "1969-12-31T19:00:00"^^xsd:date
>>
>>                     Is this because of any old version or something?
>>
>>
>>
>>                     On Thu, Aug 9, 2018 at 6:34 AM, Andy Seaborne
>>                     <a...@apache.org <mailto:a...@apache.org>> wrote:
>>
>>                         Good question - there is still a noticeable tail
>>                         of com.hp.hpl, here and
>>                         on Stackoverflow.
>>
>>                         Some is due to old apps; that is good in that
>>                         the software is useful
>>                         enough to be used for such a long time.
>>
>>                         I suspect that some of the rest is university
>>                         courses providing the
>>                         materials that have not been updated.
>>
>>                         (Jena3 was 2015-07-29)
>>
>>                              Andy
>>
>>
>>                         On 09/08/18 06:48, Lorenz Buehmann wrote:
>>
>>                             I'm always wondering how people that are new
>>                             to Apache Jena still use
>>                             the old version. I mean, the first hit via
>>                             Google is the Apache Jena
>>                             webpage which clearly refers to the latest
>>                             version.
>>
>>                             In the current case, he just copied the code
>>                             example from [1] which
>>                             indeed uses the old version given that the
>>                             blog entry is from 2005.
>>                             Well, at this time I didn't know about
>>                             Semantic Web at all...
>>
>>                             [1]
>>                             http://www.ldodds.com/projects
>> /sparql/LastModified.txt
>>                             <http://www.ldodds.com/project
>> s/sparql/LastModified.txt>
>>
>>
>>                             On 08.08.2018 22:14, Andy Seaborne wrote:
>>
>>                                 com.hp.hpl.jena -- that's Jena2.
>>
>>                                 Packages are "org.apache.jena" in Jena3.
>>
>>                                 The code seems to have been compiled
>>                                 against Jena2 and run against
>>                                 Jena3.  That won't work.
>>
>>                                       Andy
>>
>>                                 On 08/08/18 18:14, Arunkumar
>>                                 Krishnamoorthy wrote:
>>
>>                                     The java code i am executing is,
>>
>>                                     package samplejena;
>>
>>                                     import
>>                                     com.hp.hpl.jena.query.expr.NodeValue;
>>                                     import
>>                                     com.hp.hpl.jena.query.function
>> .FunctionBase1;
>>
>>                                     import java.net.*;
>>                                     import java.text.SimpleDateFormat;
>>                                     import java.util.*;
>>
>>                                     public class LastModified extends
>>                                     FunctionBase1
>>                                     {
>>                                     private static final
>>                                     SimpleDateFormat format = new
>>                                     SimpleDateFormat("yyyy-MM-dd'T
>> 'HH:mm:ss");
>>                                     private Map _cache;
>>                                     public LastModified()
>>                                     {
>>                                     _cache = new HashMap();
>>                                     }
>>                                     public NodeValue exec(NodeValue
>>                                     nodeValue)
>>                                     {
>>                                     String value = nodeValue.asString();
>>                                     if (_cache.containsKey(value))
>>                                     {
>>                                     return (NodeValue)_cache.get(value);
>>                                     }
>>                                                String lastModified = "";
>>                                     try {
>>                                     lastModified = getLastModified(
>>                                     nodeValue.asString() );
>>                                     } catch (Exception e) {
>>                                     // TODO Auto-generated catch block
>>                                     e.printStackTrace();
>>                                     }
>>
>>                                                NodeValue date =
>>                                     NodeValue.makeDate(lastModified);
>>                                                _cache.put(value, date);
>>                                                return date;
>>                                     }
>>                                     public String getLastModified(String
>>                                     link) throws Exception
>>                                     {
>>                                     URL url = new URL(link);
>>                                     URLConnection connection =
>>                                     url.openConnection();
>>                                     connection.setAllowUserInterac
>> tion(false);
>>                                     long secs =
>>                                     connection.getLastModified();
>>                                     String xsdDate = dateToXSD(secs);
>>                                     return xsdDate;
>>                                     }
>>                                     public String dateToXSD(long secs)
>>                                     {
>>                                     Date date = new Date(secs);
>>                                     return format.format(date);
>>                                     }
>>                                     }
>>
>>
>>
>>                                     On Wed, Aug 8, 2018 at 1:14 PM,
>>                                     Arunkumar Krishnamoorthy
>>                                     <akris...@ncsu.edu
>>                                     <mailto:akris...@ncsu.edu>>
>>                                     wrote:
>>
>>                                     Hello Andy,
>>
>>                                         I am getting the following issue
>>                                         when i run the code,
>>
>>                                         Caused by:
>>                                         java.lang.ClassNotFoundException:
>> com.hp.hpl.jena.query.
>>                                         function.FunctionBase1
>>                                         at
>>                                         java.net.URLClassLoader.findCl
>> ass(URLClassLoader.java:381)
>>                                         at
>>                                         java.lang.ClassLoader.loadClas
>> s(ClassLoader.java:424)
>>                                         at
>>                                         sun.misc.Launcher$AppClassLoad
>> er.loadClass(Launcher.j
>>
>>                                         I have added the .class file in
>>                                         the directory. Do i need to
>> package
>>
>>                 the
>>
>>                                         dependancy jars also? Please
>> advice.
>>
>>                                         Regards,
>>                                         Arun
>>
>>                                         On Tue, Aug 7, 2018 at 2:11 PM,
>>                                         Arunkumar Krishnamoorthy <
>>                                         akris...@ncsu.edu
>>                                         <mailto:akris...@ncsu.edu>>
>> wrote:
>>
>>                                         It is executing now Andy. Thanks
>>                                         a lot. I missed to add the
>>
>>                 directory.
>>
>>                                             Thanks again for this help.
>>
>>                                             On Tue, Aug 7, 2018 at 2:06
>>                                             PM, Andy Seaborne
>>                                             <a...@apache.org
>>                                             <mailto:a...@apache.org>>
>>
>>                                             wrote:
>>
>>
>>                                                 On 07/08/18 18:07,
>>                                                 Arunkumar Krishnamoorthy
>>                                                 wrote:
>>
>>                                                 So my JENA_CP
>>
>>                                                     is
>>
>> JENA_CP='/home/ak/Downloads/apache-jena-3.8.0/lib/*:/home/ak
>>                                                     /Documents'.
>>
>>
>>                                                 Does the file
>>
>>
>> /home/ak/Documents/samplejena/LastModified.class
>>
>>                                                 exist?
>>
>>
>>
>>                                                 /home/ak/Documents
>>                                                 location has the
>>                                                 classfile/jar of the code
>>
>>                                                     But still when i run
>>                                                     this command,
>>
>>
>> /home/ak/Downloads/apache-jena-3.8.0/bin/arq
>>                                                     --data
>>
>> /home/ak/Desktop/dataset.rdf
>>                                                     --query
>>
>> /home/ak/Desktop/query.rq
>>
>>                                                     I am getting the
>>                                                     below error,
>>
>>                                                     ak@akrish12:~$
>>
>> /home/ak/Downloads/apache-jena-3.8.0/bin/arq
>>
>>                 --data
>>
>>
>> /home/ak/Desktop/dataset.rdf
>>                                                     --query
>>
>> /home/ak/Desktop/query.rq
>>                                                     12:41:35 WARN
>>                                              ClsLoader
>>                                          :: Class not found:
>>
>> samplejena.LastModified
>>                                                     12:41:35 WARN  exec
>>                                                                    :: URI
>>
>> <java:samplejena.LastModified>
>>                                                     has no registered
>>                                                     function factory
>>                                                     -------------
>>                                                     | title | r |
>>                                                     =============
>>                                                     -------------
>>
>>
>>                                                     Regards,
>>                                                     Arun
>>
>>                                                     On Tue, Aug 7, 2018
>>                                                     at 12:20 PM, Andy
>>                                                     Seaborne
>>                                                     <a...@apache.org
>>                                                     <mailto:
>> a...@apache.org>>
>>
>>                                                     wrote:
>>
>>                                                     The list doesn't
>>                                                     accept attachments.
>>
>>
>> JENA_CP="$JENA_HOME"'/home/ak/Documents'
>>
>>                                                             This needs
>>                                                             to be a
>>                                                             valid java
>>                                                             classpath.
>>
>>                                                         $JENA_HOME is
>>                                                         directory of the
>>                                                         Jena installation.
>>
>>                                                         In the original
>>                                                         it says:
>>
>>
>> JENA_CP="$JENA_HOME"'/lib/*'
>>
>>                                                         the .../lib/*
>>                                                         (NB single
>>                                                         quotes - no *
>>                                                         expansion) puts
>>                                                         all the
>>                                                         jars in
>>                                                         that direct on
>>                                                         the classpath.
>>
>>                                                         For you:
>>
>>
>> JENA_CP='/home/ak/Downloads/apache-jena-3.8.0/lib/*'
>>
>>                                                         You need to add
>>                                                         the
>>                                                         package/classfile
>> tree
>>                                                         for you code.
>>
>>                                                         As you have:
>>                                                         java:samplejena
>>
>>                                                         Suppoose /DIR is
>>                                                         the top of that
>>                                                         directory tree
>>                                                         so "samplejena"
>>                                                         is one
>>                                                         directory within
>>                                                         /DIR.
>>
>>                                                         You then want:
>>
>>
>> JENA_CP='/home/afs/jlib/apache-jena/lib/*:/DIR'
>>
>>                                                         : is the
>>                                                         classpath
>> separator.
>>
>>                                                                 Andy
>>
>>                                                         On 07/08/18
>>                                                         16:25, Arunkumar
>>                                                         Krishnamoorthy
>>                                                         wrote:
>>
>>                                                         Hello,
>>
>>                                                             I have
>>                                                             attached the
>>                                                             file with
>>                                                             the change,
>>                                                             i am getting
>>                                                             Could
>>                                                             not find
>>                                                             or
>>                                                             load main
>>                                                             class arq.arq
>>
>>                                                             My classpath
>>                                                             location is
>>
>> /home/ak/Documents.
>>                                                             Please let
>>                                                             me know
>>                                                             whether
>>                                                             my change is
>>                                                             correct.
>>
>>                                                             Regards,
>>                                                             Arun
>>
>>
>>                                                             On Tue, Aug
>>                                                             7, 2018 at
>>                                                             11:11 AM,
>>                                                             Andy Seaborne
>> <
>>
>>                 a...@apache.org <mailto:a...@apache.org>
>>
>>                                                             <mailto:
>>
>> a...@apache.org
>>                                                             <mailto:
>> a...@apache.org>>>
>>                                                             wrote:
>>
>>                                                                     Hi -
>>                                                             Please send
>>                                                             email to the
>>                                                             jena users
>>                                                             mailing list.
>>
>>                                                                     (It
>>                                                             is correct
>>                                                             if it works!)
>>
>>
>>                                                           Andy
>>
>>
>>
>>
>>
>>
>>
>>
>>

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