Java User Function and Context Awareness

On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > It seems that there is no way for a Java user function installed in the > Repository to get access to the current context node. > Yes the context is available because of extending abstract QueryModule, but > it seems the value of the current context node has been wiped out by the > call from UserFunc.value() [at UserFunc:line 170] before it gets to the > actual user function [during line 175]. > Is there some way for a user function to recover that value, or is this just > a limitation of the user function mechanism? > Thanks. > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Java Source: > package cnde.module; > import org.basex.query.QueryException; > import org.basex.query.QueryModule; > import org.basex.query.iter.Iter; > import org.basex.query.value.Value; > import org.basex.query.value.item.Item; > import org.basex.query.value.item.Uri; > import org.basex.query.value.node.ANode; > import org.basex.query.value.type.NodeType; > public class DbXml extends QueryModule { > > @Requires(Permission.NONE) > @ContextDependent > @FocusDependent > public String metadata(String qname) { > try { > Value val = context.value; > if(val == null) { > return null; > } > Item it = null; > if(val.isItem()) { > it = (Item)val; > } else { > throw new QueryException(val + " not an item"); > } > if(!(it instanceof ANode)) throw new QueryException(it + " not a node"); > ANode node = (ANode)it; > if(node.type != NodeType.DOC) return "node is not a document node"; > final byte[] uri = node.baseURI(); > String s = uri.length == 0 ? null : Uri.uri(uri, false).toString(); > return s == null? "no uri for node" : s.replace("/", > "/hdl:okwffu/"); > } catch (QueryException e) { > System.err.println(e); > return e.getMessage(); > } > } > } > > wrapper.xq: > module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; > declare namespace p="java:cnde.module.DbXml"; > declare function dbxml:metadata($key as xs:string) as xs:string* { > let $meta := p:new() > return p:metadata($meta, $key) > }; > > basex.xml: > <package xmlns="http://www.basex.org/modules/pkg"> > <jar>containment.jar</jar> > <class>cnde.service.operator.GraphContainment</class> > </package> > > expath-pkg.xml: > <package xmlns="http://expath.org/ns/pkg" > name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" version="1.0.0" > spec="1.0"> > <title>dbxml metadata</title> > <dependency processor="basex"/> > <xquery> > <namespace>http://www.sleepycat.com/2002/dbxml</namespace> > <file>wrapper.xq</file> > </xquery> > </package> > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 8:39 AM > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > Dear Jeff, > > Afair, UserFunc should never be evaluated when calling a Java > function. Do you have an sscce for demonstrating your use case? > > By extending the QueryModule class, you are getting access to all > internal query process information, and the current context is one of > them. As you already guessed, it can be retrieved via "context.value". > > Another alternative is to pass on the current context as argument.. > > Q{java:.....}func(.) > > Best, > Christian > ___________________________ > > On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> It seems that there is no way for a Java user function installed in the >> Repository to get access to the current context node. >> Yes the context is available because of extending abstract QueryModule, >> but >> it seems the value of the current context node has been wiped out by the >> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >> actual user function [during line 175]. >> Is there some way for a user function to recover that value, or is this >> just >> a limitation of the user function mechanism? >> Thanks. >> >> _______________________________________________ >> BaseX-Talk mailing list >> BaseX-Talk at mailman.uni-konstanz.de >> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>

On Fri, Feb 1, 2013 at 6:22 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Yes, of course: > > package cnde.module; > import org.basex.core.Context; > import org.basex.core.cmd.Add; > import org.basex.core.cmd.CreateDB; > import org.basex.core.cmd.DropDB; > import org.basex.core.cmd.XQuery; > import org.junit.Test; > public class DbXmlTest { > > @Test > public void test() { > try { > Context context = new Context(); > // String result1 = new > XQuery("repo:install('C:\\Users\\jlansing\\workspaceTEST\\dbxml-module\\dbxml-module-1.0.0.xar')").execute(context); > // System.out.println(result1); > > new CreateDB("test").execute(context); > new Add("12345", "<doc><guid>12345</guid></doc>").execute(context); > String result = new XQuery("import module namespace > dbxml='http://www.sleepycat.com/2002/dbxml'; > ((collection('test'))[1])/dbxml:metadata('dbxml:name')").execute(context); > String result2 = new > XQuery("((collection('test'))[1])/document-uri()").execute(context); > System.out.println(result + " " + result2); > new DropDB("test").execute(context); > > context.close(); > } catch(Exception e) { > e.printStackTrace(); > } > } > } > > > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 9:15 AM > > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > What’s the query you are trying to run? > ___________________________ > > On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> Java Source: >> package cnde.module; >> import org.basex.query.QueryException; >> import org.basex.query.QueryModule; >> import org.basex.query.iter.Iter; >> import org.basex.query.value.Value; >> import org.basex.query.value.item.Item; >> import org.basex.query.value.item.Uri; >> import org.basex.query.value.node.ANode; >> import org.basex.query.value.type.NodeType; >> public class DbXml extends QueryModule { >> >> @Requires(Permission.NONE) >> @ContextDependent >> @FocusDependent >> public String metadata(String qname) { >> try { >> Value val = context.value; >> if(val == null) { >> return null; >> } >> Item it = null; >> if(val.isItem()) { >> it = (Item)val; >> } else { >> throw new QueryException(val + " not an item"); >> } >> if(!(it instanceof ANode)) throw new QueryException(it + " not a >> node"); >> ANode node = (ANode)it; >> if(node.type != NodeType.DOC) return "node is not a document node"; >> final byte[] uri = node.baseURI(); >> String s = uri.length == 0 ? null : Uri.uri(uri, >> false).toString(); >> return s == null? "no uri for node" : s.replace("/", >> "/hdl:okwffu/"); >> } catch (QueryException e) { >> System.err.println(e); >> return e.getMessage(); >> } >> } >> } >> >> wrapper.xq: >> module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; >> declare namespace p="java:cnde.module.DbXml"; >> declare function dbxml:metadata($key as xs:string) as xs:string* { >> let $meta := p:new() >> return p:metadata($meta, $key) >> }; >> >> basex.xml: >> <package xmlns="http://www.basex.org/modules/pkg"> >> <jar>containment.jar</jar> >> <class>cnde.service.operator.GraphContainment</class> >> </package> >> >> expath-pkg.xml: >> <package xmlns="http://expath.org/ns/pkg" >> name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" version="1.0.0" >> spec="1.0"> >> <title>dbxml metadata</title> >> <dependency processor="basex"/> >> <xquery> >> <namespace>http://www.sleepycat.com/2002/dbxml</namespace> >> <file>wrapper.xq</file> >> </xquery> >> </package> >> >> ________________________________ >> From: Christian Grün >> Sent: Fri 2/1/2013 8:39 AM >> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >> Cc: basex-talk at mailman.uni-konstanz.de >> Subject: Re: [basex-talk] Java User Function and Context Awareness >> >> Dear Jeff, >> >> Afair, UserFunc should never be evaluated when calling a Java >> function. Do you have an sscce for demonstrating your use case? >> >> By extending the QueryModule class, you are getting access to all >> internal query process information, and the current context is one of >> them. As you already guessed, it can be retrieved via "context.value". >> >> Another alternative is to pass on the current context as argument.. >> >> Q{java:.....}func(.) >> >> Best, >> Christian >> ___________________________ >> >> On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV >> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>> It seems that there is no way for a Java user function installed in the >>> Repository to get access to the current context node. >>> Yes the context is available because of extending abstract QueryModule, >>> but >>> it seems the value of the current context node has been wiped out by the >>> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >>> actual user function [during line 175]. >>> Is there some way for a user function to recover that value, or is this >>> just >>> a limitation of the user function mechanism? >>> Thanks. >>> >>> _______________________________________________ >>> BaseX-Talk mailing list >>> BaseX-Talk at mailman.uni-konstanz.de >>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>

On Fri, Feb 1, 2013 at 6:47 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Sorry, wrong basex.xml. Here's the correct one: > > <package xmlns="http://www.basex.org/modules/pkg"> > <jar>dbxml-module.jar</jar> > <class>cnde.module.DbXml</class> > </package> > > Ant build.xml: > <project default="module" name="dbxml-module" basedir="."> > <property name="base.name" value="dbxml-module"/> > <property name="jar.name" value="${base.name}.jar"/> > <path id="class.path"> > <fileset dir="C:/xquery/basex"> > <include name="BaseX.jar"/> > </fileset> > </path> > <target name="compile"> > <mkdir dir="build"/> > <mkdir dir="build/classes"/> > <javac destdir="./build/classes" classpathref="class.path" debug="true"> > <src path="src"/> > </javac> > </target> > <target name="jar" depends="compile"> > <jar destfile="${jar.name}"> > <fileset dir="./build/classes"> > <include name="**/*.class"/> > </fileset> > <manifest> > <attribute name="Main-Class" value="cnde.module.DbXml"/> > </manifest> > </jar> > <delete dir="build"/> > </target> > <target name="module" depends="jar"> > <zip destfile="${base.name}-1.0.0.xar"> > <zipfileset dir="."> > <include name="expath-pkg.xml"/> > <include name="basex.xml"/> > </zipfileset> > <zipfileset dir="." prefix="dbxml"> > <include name="wrapper.xq"/> > <include name="${jar.name}"/> > </zipfileset> > </zip> > <copy > todir="C:\xquery\basex\repo\http-www.sleepycat.com-2002-dbxml-1.0.0\dbxml" > file="${jar.name}"/> > </target> > </project> > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 9:30 AM > > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > Hm, doesn’t look too self-contained (e.g., I can’t find > GraphContainment anywhere). For testing purposes, it may be easier to > build a simple BaseX package and do EXPath in a next step (see [1] for > more details). > > Thanks, > Christian > > [1] http://docs.basex.org/wiki/Repository > ___________________________ > > On Fri, Feb 1, 2013 at 6:22 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> Yes, of course: >> >> package cnde.module; >> import org.basex.core.Context; >> import org.basex.core.cmd.Add; >> import org.basex.core.cmd.CreateDB; >> import org.basex.core.cmd.DropDB; >> import org.basex.core.cmd.XQuery; >> import org.junit.Test; >> public class DbXmlTest { >> >> @Test >> public void test() { >> try { >> Context context = new Context(); >> // String result1 = new >> >> XQuery("repo:install('C:\\Users\\jlansing\\workspaceTEST\\dbxml-module\\dbxml-module-1.0.0.xar')").execute(context); >> // System.out.println(result1); >> >> new CreateDB("test").execute(context); >> new Add("12345", "<doc><guid>12345</guid></doc>").execute(context); >> String result = new XQuery("import module namespace >> dbxml='http://www.sleepycat.com/2002/dbxml'; >> ((collection('test'))[1])/dbxml:metadata('dbxml:name')").execute(context); >> String result2 = new >> XQuery("((collection('test'))[1])/document-uri()").execute(context); >> System.out.println(result + " " + result2); >> new DropDB("test").execute(context); >> >> context.close(); >> } catch(Exception e) { >> e.printStackTrace(); >> } >> } >> } >> >> >> >> ________________________________ >> From: Christian Grün >> Sent: Fri 2/1/2013 9:15 AM >> >> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >> Cc: basex-talk at mailman.uni-konstanz.de >> Subject: Re: [basex-talk] Java User Function and Context Awareness >> >> What’s the query you are trying to run? >> ___________________________ >> >> On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV >> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>> Java Source: >>> package cnde.module; >>> import org.basex.query.QueryException; >>> import org.basex.query.QueryModule; >>> import org.basex.query.iter.Iter; >>> import org.basex.query.value.Value; >>> import org.basex.query.value.item.Item; >>> import org.basex.query.value.item.Uri; >>> import org.basex.query.value.node.ANode; >>> import org.basex.query.value.type.NodeType; >>> public class DbXml extends QueryModule { >>> >>> @Requires(Permission.NONE) >>> @ContextDependent >>> @FocusDependent >>> public String metadata(String qname) { >>> try { >>> Value val = context.value; >>> if(val == null) { >>> return null; >>> } >>> Item it = null; >>> if(val.isItem()) { >>> it = (Item)val; >>> } else { >>> throw new QueryException(val + " not an item"); >>> } >>> if(!(it instanceof ANode)) throw new QueryException(it + " not a >>> node"); >>> ANode node = (ANode)it; >>> if(node.type != NodeType.DOC) return "node is not a document node"; >>> final byte[] uri = node.baseURI(); >>> String s = uri.length == 0 ? null : Uri.uri(uri, >>> false).toString(); >>> return s == null? "no uri for node" : s.replace("/", >>> "/hdl:okwffu/"); >>> } catch (QueryException e) { >>> System.err.println(e); >>> return e.getMessage(); >>> } >>> } >>> } >>> >>> wrapper.xq: >>> module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; >>> declare namespace p="java:cnde.module.DbXml"; >>> declare function dbxml:metadata($key as xs:string) as xs:string* { >>> let $meta := p:new() >>> return p:metadata($meta, $key) >>> }; >>> >>> basex.xml: >>> <package xmlns="http://www.basex.org/modules/pkg"> >>> <jar>containment.jar</jar> >>> <class>cnde.service.operator.GraphContainment</class> >>> </package> >>> >>> expath-pkg.xml: >>> <package xmlns="http://expath.org/ns/pkg" >>> name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" version="1.0.0" >>> spec="1.0"> >>> <title>dbxml metadata</title> >>> <dependency processor="basex"/> >>> <xquery> >>> <namespace>http://www.sleepycat.com/2002/dbxml</namespace> >>> <file>wrapper.xq</file> >>> </xquery> >>> </package> >>> >>> ________________________________ >>> From: Christian Grün >>> Sent: Fri 2/1/2013 8:39 AM >>> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >>> Cc: basex-talk at mailman.uni-konstanz.de >>> Subject: Re: [basex-talk] Java User Function and Context Awareness >>> >>> Dear Jeff, >>> >>> Afair, UserFunc should never be evaluated when calling a Java >>> function. Do you have an sscce for demonstrating your use case? >>> >>> By extending the QueryModule class, you are getting access to all >>> internal query process information, and the current context is one of >>> them. As you already guessed, it can be retrieved via "context.value". >>> >>> Another alternative is to pass on the current context as argument.. >>> >>> Q{java:.....}func(.) >>> >>> Best, >>> Christian >>> ___________________________ >>> >>> On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV >>> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>>> It seems that there is no way for a Java user function installed in the >>>> Repository to get access to the current context node. >>>> Yes the context is available because of extending abstract QueryModule, >>>> but >>>> it seems the value of the current context node has been wiped out by the >>>> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >>>> actual user function [during line 175]. >>>> Is there some way for a user function to recover that value, or is this >>>> just >>>> a limitation of the user function mechanism? >>>> Thanks. >>>> >>>> _______________________________________________ >>>> BaseX-Talk mailing list >>>> BaseX-Talk at mailman.uni-konstanz.de >>>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>>

From: Christian Grün Sent: Fri 2/1/2013 8:39 AM To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 Cc: basex-talk at mailman.uni-konstanz.de Subject: Re: [basex-talk] Java User Function and Context Awareness Dear Jeff, Afair, UserFunc should never be evaluated when calling a Java function. Do you have an sscce for demonstrating your use case? By extending the QueryModule class, you are getting access to all internal query process information, and the current context is one of them. As you already guessed, it can be retrieved via "context.value". Another alternative is to pass on the current context as argument.. Q{java:.....}func(.) Best, Christian On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > It seems that there is no way for a Java user function installed in the > Repository to get access to the current context node. > Yes the context is available because of extending abstract QueryModule, but > it seems the value of the current context node has been wiped out by the > call from UserFunc.value() [at UserFunc:line 170] before it gets to the > actual user function [during line 175]. > Is there some way for a user function to recover that value, or is this just > a limitation of the user function mechanism? > Thanks. > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

From: Christian Grün Sent: Fri 2/1/2013 9:15 AM To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 Cc: basex-talk at mailman.uni-konstanz.de Subject: Re: [basex-talk] Java User Function and Context Awareness What's the query you are trying to run? On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Java Source: > package cnde.module; > import org.basex.query.QueryException; > import org.basex.query.QueryModule; > import org.basex.query.iter.Iter; > import org.basex.query.value.Value; > import org.basex.query.value.item.Item; > import org.basex.query.value.item.Uri; > import org.basex.query.value.node.ANode; > import org.basex.query.value.type.NodeType; > public class DbXml extends QueryModule { > > @Requires(Permission.NONE) > @ContextDependent > @FocusDependent > public String metadata(String qname) { > try { > Value val = context.value; > if(val == null) { > return null; > } > Item it = null; > if(val.isItem()) { > it = (Item)val; > } else { > throw new QueryException(val + " not an item"); > } > if(!(it instanceof ANode)) throw new QueryException(it + " not a node"); > ANode node = (ANode)it; > if(node.type != NodeType.DOC) return "node is not a document node"; > final byte[] uri = node.baseURI(); > String s = uri.length == 0 ? null : Uri.uri(uri, false).toString(); > return s == null? "no uri for node" : s.replace("/", > "/hdl:okwffu/"); > } catch (QueryException e) { > System.err.println(e); > return e.getMessage(); > } > } > } > > wrapper.xq: > module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; > declare namespace p="java:cnde.module.DbXml"; > declare function dbxml:metadata($key as xs:string) as xs:string* { > let $meta := p:new() > return p:metadata($meta, $key) > }; > > basex.xml: > <package xmlns="http://www.basex.org/modules/pkg"> > <jar>containment.jar</jar> > <class>cnde.service.operator.GraphContainment</class> > </package> > > expath-pkg.xml: > <package xmlns="http://expath.org/ns/pkg" > name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" version="1.0.0" > spec="1.0"> > <title>dbxml metadata</title> > <dependency processor="basex"/> > <xquery> > <namespace>http://www.sleepycat.com/2002/dbxml</namespace> > <file>wrapper.xq</file> > </xquery> > </package> > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 8:39 AM > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > Dear Jeff, > > Afair, UserFunc should never be evaluated when calling a Java > function. Do you have an sscce for demonstrating your use case? > > By extending the QueryModule class, you are getting access to all > internal query process information, and the current context is one of > them. As you already guessed, it can be retrieved via "context.value". > > Another alternative is to pass on the current context as argument.. > > Q{java:.....}func(.) > > Best, > Christian > ___________________________ > > On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> It seems that there is no way for a Java user function installed in the >> Repository to get access to the current context node. >> Yes the context is available because of extending abstract QueryModule, >> but >> it seems the value of the current context node has been wiped out by the >> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >> actual user function [during line 175]. >> Is there some way for a user function to recover that value, or is this >> just >> a limitation of the user function mechanism? >> Thanks. >> >> _______________________________________________ >> BaseX-Talk mailing list >> BaseX-Talk at mailman.uni-konstanz.de >> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>

On Fri, Feb 1, 2013 at 7:13 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Yes, you are seeing the output of the second XQuery, which calls > document-uri() for comparison. > But the first XQuery returned nothing (expected to see it return: > "test/hdl:okwffu/12345"). > Why? > It can only be because context.value was null (since every other path throws > an Exception). > > If you look in a debugger, you see that context.value had a DBNode value > until just before UserFunc.value() at line 170, which was just before the > metadata() function was called. > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 9:56 AM > > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > Your code outputs "test/12345" on my machine, so I’m not sure what’s > the problem, or what you were expecting to get. > ___________________________ > > On Fri, Feb 1, 2013 at 6:47 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> Sorry, wrong basex.xml. Here's the correct one: >> >> <package xmlns="http://www.basex.org/modules/pkg"> >> <jar>dbxml-module.jar</jar> >> <class>cnde.module.DbXml</class> >> </package> >> >> Ant build.xml: >> <project default="module" name="dbxml-module" basedir="."> >> <property name="base.name" value="dbxml-module"/> >> <property name="jar.name" value="${base.name}.jar"/> >> <path id="class.path"> >> <fileset dir="C:/xquery/basex"> >> <include name="BaseX.jar"/> >> </fileset> >> </path> >> <target name="compile"> >> <mkdir dir="build"/> >> <mkdir dir="build/classes"/> >> <javac destdir="./build/classes" classpathref="class.path" >> debug="true"> >> <src path="src"/> >> </javac> >> </target> >> <target name="jar" depends="compile"> >> <jar destfile="${jar.name}"> >> <fileset dir="./build/classes"> >> <include name="**/*.class"/> >> </fileset> >> <manifest> >> <attribute name="Main-Class" value="cnde.module.DbXml"/> >> </manifest> >> </jar> >> <delete dir="build"/> >> </target> >> <target name="module" depends="jar"> >> <zip destfile="${base.name}-1.0.0.xar"> >> <zipfileset dir="."> >> <include name="expath-pkg.xml"/> >> <include name="basex.xml"/> >> </zipfileset> >> <zipfileset dir="." prefix="dbxml"> >> <include name="wrapper.xq"/> >> <include name="${jar.name}"/> >> </zipfileset> >> </zip> >> <copy >> todir="C:\xquery\basex\repo\http-www.sleepycat.com-2002-dbxml-1.0.0\dbxml" >> file="${jar.name}"/> >> </target> >> </project> >> >> ________________________________ >> From: Christian Grün >> Sent: Fri 2/1/2013 9:30 AM >> >> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >> Cc: basex-talk at mailman.uni-konstanz.de >> Subject: Re: [basex-talk] Java User Function and Context Awareness >> >> Hm, doesn’t look too self-contained (e.g., I can’t find >> GraphContainment anywhere). For testing purposes, it may be easier to >> build a simple BaseX package and do EXPath in a next step (see [1] for >> more details). >> >> Thanks, >> Christian >> >> [1] http://docs.basex.org/wiki/Repository >> ___________________________ >> >> On Fri, Feb 1, 2013 at 6:22 PM, Lansing, Jeff J CIV >> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>> Yes, of course: >>> >>> package cnde.module; >>> import org.basex.core.Context; >>> import org.basex.core.cmd.Add; >>> import org.basex.core.cmd.CreateDB; >>> import org.basex.core.cmd.DropDB; >>> import org.basex.core.cmd.XQuery; >>> import org.junit.Test; >>> public class DbXmlTest { >>> >>> @Test >>> public void test() { >>> try { >>> Context context = new Context(); >>> // String result1 = new >>> >>> >>> XQuery("repo:install('C:\\Users\\jlansing\\workspaceTEST\\dbxml-module\\dbxml-module-1.0.0.xar')").execute(context); >>> // System.out.println(result1); >>> >>> new CreateDB("test").execute(context); >>> new Add("12345", "<doc><guid>12345</guid></doc>").execute(context); >>> String result = new XQuery("import module namespace >>> dbxml='http://www.sleepycat.com/2002/dbxml'; >>> >>> ((collection('test'))[1])/dbxml:metadata('dbxml:name')").execute(context); >>> String result2 = new >>> XQuery("((collection('test'))[1])/document-uri()").execute(context); >>> System.out.println(result + " " + result2); >>> new DropDB("test").execute(context); >>> >>> context.close(); >>> } catch(Exception e) { >>> e.printStackTrace(); >>> } >>> } >>> } >>> >>> >>> >>> ________________________________ >>> From: Christian Grün >>> Sent: Fri 2/1/2013 9:15 AM >>> >>> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >>> Cc: basex-talk at mailman.uni-konstanz.de >>> Subject: Re: [basex-talk] Java User Function and Context Awareness >>> >>> What’s the query you are trying to run? >>> ___________________________ >>> >>> On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV >>> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>>> Java Source: >>>> package cnde.module; >>>> import org.basex.query.QueryException; >>>> import org.basex.query.QueryModule; >>>> import org.basex.query.iter.Iter; >>>> import org.basex.query.value.Value; >>>> import org.basex.query.value.item.Item; >>>> import org.basex.query.value.item.Uri; >>>> import org.basex.query.value.node.ANode; >>>> import org.basex.query.value.type.NodeType; >>>> public class DbXml extends QueryModule { >>>> >>>> @Requires(Permission.NONE) >>>> @ContextDependent >>>> @FocusDependent >>>> public String metadata(String qname) { >>>> try { >>>> Value val = context.value; >>>> if(val == null) { >>>> return null; >>>> } >>>> Item it = null; >>>> if(val.isItem()) { >>>> it = (Item)val; >>>> } else { >>>> throw new QueryException(val + " not an item"); >>>> } >>>> if(!(it instanceof ANode)) throw new QueryException(it + " not a >>>> node"); >>>> ANode node = (ANode)it; >>>> if(node.type != NodeType.DOC) return "node is not a document node"; >>>> final byte[] uri = node.baseURI(); >>>> String s = uri.length == 0 ? null : Uri.uri(uri, >>>> false).toString(); >>>> return s == null? "no uri for node" : s.replace("/", >>>> "/hdl:okwffu/"); >>>> } catch (QueryException e) { >>>> System.err.println(e); >>>> return e.getMessage(); >>>> } >>>> } >>>> } >>>> >>>> wrapper.xq: >>>> module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; >>>> declare namespace p="java:cnde.module.DbXml"; >>>> declare function dbxml:metadata($key as xs:string) as xs:string* { >>>> let $meta := p:new() >>>> return p:metadata($meta, $key) >>>> }; >>>> >>>> basex.xml: >>>> <package xmlns="http://www.basex.org/modules/pkg"> >>>> <jar>containment.jar</jar> >>>> <class>cnde.service.operator.GraphContainment</class> >>>> </package> >>>> >>>> expath-pkg.xml: >>>> <package xmlns="http://expath.org/ns/pkg" >>>> name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" >>>> version="1.0.0" >>>> spec="1.0"> >>>> <title>dbxml metadata</title> >>>> <dependency processor="basex"/> >>>> <xquery> >>>> <namespace>http://www.sleepycat.com/2002/dbxml</namespace> >>>> <file>wrapper.xq</file> >>>> </xquery> >>>> </package> >>>> >>>> ________________________________ >>>> From: Christian Grün >>>> Sent: Fri 2/1/2013 8:39 AM >>>> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >>>> Cc: basex-talk at mailman.uni-konstanz.de >>>> Subject: Re: [basex-talk] Java User Function and Context Awareness >>>> >>>> Dear Jeff, >>>> >>>> Afair, UserFunc should never be evaluated when calling a Java >>>> function. Do you have an sscce for demonstrating your use case? >>>> >>>> By extending the QueryModule class, you are getting access to all >>>> internal query process information, and the current context is one of >>>> them. As you already guessed, it can be retrieved via "context.value". >>>> >>>> Another alternative is to pass on the current context as argument.. >>>> >>>> Q{java:.....}func(.) >>>> >>>> Best, >>>> Christian >>>> ___________________________ >>>> >>>> On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV >>>> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>>>> It seems that there is no way for a Java user function installed in >>>>> the >>>>> Repository to get access to the current context node. >>>>> Yes the context is available because of extending abstract QueryModule, >>>>> but >>>>> it seems the value of the current context node has been wiped out by >>>>> the >>>>> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >>>>> actual user function [during line 175]. >>>>> Is there some way for a user function to recover that value, or is this >>>>> just >>>>> a limitation of the user function mechanism? >>>>> Thanks. >>>>> >>>>> _______________________________________________ >>>>> BaseX-Talk mailing list >>>>> BaseX-Talk at mailman.uni-konstanz.de >>>>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>>>

From: Christian Grün Sent: Fri 2/1/2013 9:30 AM To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 Cc: basex-talk at mailman.uni-konstanz.de Subject: Re: [basex-talk] Java User Function and Context Awareness Hm, doesn't look too self-contained (e.g., I can't find GraphContainment anywhere). For testing purposes, it may be easier to build a simple BaseX package and do EXPath in a next step (see [1] for more details). Thanks, Christian [1] http://docs.basex.org/wiki/Repository On Fri, Feb 1, 2013 at 6:22 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Yes, of course: > > package cnde.module; > import org.basex.core.Context; > import org.basex.core.cmd.Add; > import org.basex.core.cmd.CreateDB; > import org.basex.core.cmd.DropDB; > import org.basex.core.cmd.XQuery; > import org.junit.Test; > public class DbXmlTest { > > @Test > public void test() { > try { > Context context = new Context(); > // String result1 = new > XQuery("repo:install('C:\\Users\\jlansing\\workspaceTEST\\dbxml-module\\dbxml-module-1.0.0.xar')").execute(context); > // System.out.println(result1); > > new CreateDB("test").execute(context); > new Add("12345", "<doc><guid>12345</guid></doc>").execute(context); > String result = new XQuery("import module namespace > dbxml='http://www.sleepycat.com/2002/dbxml'; > ((collection('test'))[1])/dbxml:metadata('dbxml:name')").execute(context); > String result2 = new > XQuery("((collection('test'))[1])/document-uri()").execute(context); > System.out.println(result + " " + result2); > new DropDB("test").execute(context); > > context.close(); > } catch(Exception e) { > e.printStackTrace(); > } > } > } > > > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 9:15 AM > > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > What's the query you are trying to run? > ___________________________ > > On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> Java Source: >> package cnde.module; >> import org.basex.query.QueryException; >> import org.basex.query.QueryModule; >> import org.basex.query.iter.Iter; >> import org.basex.query.value.Value; >> import org.basex.query.value.item.Item; >> import org.basex.query.value.item.Uri; >> import org.basex.query.value.node.ANode; >> import org.basex.query.value.type.NodeType; >> public class DbXml extends QueryModule { >> >> @Requires(Permission.NONE) >> @ContextDependent >> @FocusDependent >> public String metadata(String qname) { >> try { >> Value val = context.value; >> if(val == null) { >> return null; >> } >> Item it = null; >> if(val.isItem()) { >> it = (Item)val; >> } else { >> throw new QueryException(val + " not an item"); >> } >> if(!(it instanceof ANode)) throw new QueryException(it + " not a >> node"); >> ANode node = (ANode)it; >> if(node.type != NodeType.DOC) return "node is not a document node"; >> final byte[] uri = node.baseURI(); >> String s = uri.length == 0 ? null : Uri.uri(uri, >> false).toString(); >> return s == null? "no uri for node" : s.replace("/", >> "/hdl:okwffu/"); >> } catch (QueryException e) { >> System.err.println(e); >> return e.getMessage(); >> } >> } >> } >> >> wrapper.xq: >> module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; >> declare namespace p="java:cnde.module.DbXml"; >> declare function dbxml:metadata($key as xs:string) as xs:string* { >> let $meta := p:new() >> return p:metadata($meta, $key) >> }; >> >> basex.xml: >> <package xmlns="http://www.basex.org/modules/pkg"> >> <jar>containment.jar</jar> >> <class>cnde.service.operator.GraphContainment</class> >> </package> >> >> expath-pkg.xml: >> <package xmlns="http://expath.org/ns/pkg" >> name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" version="1.0.0" >> spec="1.0"> >> <title>dbxml metadata</title> >> <dependency processor="basex"/> >> <xquery> >> <namespace>http://www.sleepycat.com/2002/dbxml</namespace> >> <file>wrapper.xq</file> >> </xquery> >> </package> >> >> ________________________________ >> From: Christian Grün >> Sent: Fri 2/1/2013 8:39 AM >> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >> Cc: basex-talk at mailman.uni-konstanz.de >> Subject: Re: [basex-talk] Java User Function and Context Awareness >> >> Dear Jeff, >> >> Afair, UserFunc should never be evaluated when calling a Java >> function. Do you have an sscce for demonstrating your use case? >> >> By extending the QueryModule class, you are getting access to all >> internal query process information, and the current context is one of >> them. As you already guessed, it can be retrieved via "context.value". >> >> Another alternative is to pass on the current context as argument.. >> >> Q{java:.....}func(.) >> >> Best, >> Christian >> ___________________________ >> >> On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV >> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>> It seems that there is no way for a Java user function installed in the >>> Repository to get access to the current context node. >>> Yes the context is available because of extending abstract QueryModule, >>> but >>> it seems the value of the current context node has been wiped out by the >>> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >>> actual user function [during line 175]. >>> Is there some way for a user function to recover that value, or is this >>> just >>> a limitation of the user function mechanism? >>> Thanks. >>> >>> _______________________________________________ >>> BaseX-Talk mailing list >>> BaseX-Talk at mailman.uni-konstanz.de >>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>

From: Christian Grün Sent: Fri 2/1/2013 9:56 AM To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 Cc: basex-talk at mailman.uni-konstanz.de Subject: Re: [basex-talk] Java User Function and Context Awareness Your code outputs "test/12345" on my machine, so I'm not sure what's the problem, or what you were expecting to get. On Fri, Feb 1, 2013 at 6:47 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Sorry, wrong basex.xml. Here's the correct one: > > <package xmlns="http://www.basex.org/modules/pkg"> > <jar>dbxml-module.jar</jar> > <class>cnde.module.DbXml</class> > </package> > > Ant build.xml: > <project default="module" name="dbxml-module" basedir="."> > <property name="base.name" value="dbxml-module"/> > <property name="jar.name" value="${base.name}.jar"/> > <path id="class.path"> > <fileset dir="C:/xquery/basex"> > <include name="BaseX.jar"/> > </fileset> > </path> > <target name="compile"> > <mkdir dir="build"/> > <mkdir dir="build/classes"/> > <javac destdir="./build/classes" classpathref="class.path" debug="true"> > <src path="src"/> > </javac> > </target> > <target name="jar" depends="compile"> > <jar destfile="${jar.name}"> > <fileset dir="./build/classes"> > <include name="**/*.class"/> > </fileset> > <manifest> > <attribute name="Main-Class" value="cnde.module.DbXml"/> > </manifest> > </jar> > <delete dir="build"/> > </target> > <target name="module" depends="jar"> > <zip destfile="${base.name}-1.0.0.xar"> > <zipfileset dir="."> > <include name="expath-pkg.xml"/> > <include name="basex.xml"/> > </zipfileset> > <zipfileset dir="." prefix="dbxml"> > <include name="wrapper.xq"/> > <include name="${jar.name}"/> > </zipfileset> > </zip> > <copy > todir="C:\xquery\basex\repo\http-www.sleepycat.com-2002-dbxml-1.0.0\dbxml" > file="${jar.name}"/> > </target> > </project> > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 9:30 AM > > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > Hm, doesn't look too self-contained (e.g., I can't find > GraphContainment anywhere). For testing purposes, it may be easier to > build a simple BaseX package and do EXPath in a next step (see [1] for > more details). > > Thanks, > Christian > > [1] http://docs.basex.org/wiki/Repository > ___________________________ > > On Fri, Feb 1, 2013 at 6:22 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> Yes, of course: >> >> package cnde.module; >> import org.basex.core.Context; >> import org.basex.core.cmd.Add; >> import org.basex.core.cmd.CreateDB; >> import org.basex.core.cmd.DropDB; >> import org.basex.core.cmd.XQuery; >> import org.junit.Test; >> public class DbXmlTest { >> >> @Test >> public void test() { >> try { >> Context context = new Context(); >> // String result1 = new >> >> XQuery("repo:install('C:\\Users\\jlansing\\workspaceTEST\\dbxml-module\\dbxml-module-1.0.0.xar')").execute(context); >> // System.out.println(result1); >> >> new CreateDB("test").execute(context); >> new Add("12345", "<doc><guid>12345</guid></doc>").execute(context); >> String result = new XQuery("import module namespace >> dbxml='http://www.sleepycat.com/2002/dbxml'; >> ((collection('test'))[1])/dbxml:metadata('dbxml:name')").execute(context); >> String result2 = new >> XQuery("((collection('test'))[1])/document-uri()").execute(context); >> System.out.println(result + " " + result2); >> new DropDB("test").execute(context); >> >> context.close(); >> } catch(Exception e) { >> e.printStackTrace(); >> } >> } >> } >> >> >> >> ________________________________ >> From: Christian Grün >> Sent: Fri 2/1/2013 9:15 AM >> >> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >> Cc: basex-talk at mailman.uni-konstanz.de >> Subject: Re: [basex-talk] Java User Function and Context Awareness >> >> What's the query you are trying to run? >> ___________________________ >> >> On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV >> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>> Java Source: >>> package cnde.module; >>> import org.basex.query.QueryException; >>> import org.basex.query.QueryModule; >>> import org.basex.query.iter.Iter; >>> import org.basex.query.value.Value; >>> import org.basex.query.value.item.Item; >>> import org.basex.query.value.item.Uri; >>> import org.basex.query.value.node.ANode; >>> import org.basex.query.value.type.NodeType; >>> public class DbXml extends QueryModule { >>> >>> @Requires(Permission.NONE) >>> @ContextDependent >>> @FocusDependent >>> public String metadata(String qname) { >>> try { >>> Value val = context.value; >>> if(val == null) { >>> return null; >>> } >>> Item it = null; >>> if(val.isItem()) { >>> it = (Item)val; >>> } else { >>> throw new QueryException(val + " not an item"); >>> } >>> if(!(it instanceof ANode)) throw new QueryException(it + " not a >>> node"); >>> ANode node = (ANode)it; >>> if(node.type != NodeType.DOC) return "node is not a document node"; >>> final byte[] uri = node.baseURI(); >>> String s = uri.length == 0 ? null : Uri.uri(uri, >>> false).toString(); >>> return s == null? "no uri for node" : s.replace("/", >>> "/hdl:okwffu/"); >>> } catch (QueryException e) { >>> System.err.println(e); >>> return e.getMessage(); >>> } >>> } >>> } >>> >>> wrapper.xq: >>> module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; >>> declare namespace p="java:cnde.module.DbXml"; >>> declare function dbxml:metadata($key as xs:string) as xs:string* { >>> let $meta := p:new() >>> return p:metadata($meta, $key) >>> }; >>> >>> basex.xml: >>> <package xmlns="http://www.basex.org/modules/pkg"> >>> <jar>containment.jar</jar> >>> <class>cnde.service.operator.GraphContainment</class> >>> </package> >>> >>> expath-pkg.xml: >>> <package xmlns="http://expath.org/ns/pkg" >>> name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" version="1.0.0" >>> spec="1.0"> >>> <title>dbxml metadata</title> >>> <dependency processor="basex"/> >>> <xquery> >>> <namespace>http://www.sleepycat.com/2002/dbxml</namespace> >>> <file>wrapper.xq</file> >>> </xquery> >>> </package> >>> >>> ________________________________ >>> From: Christian Grün >>> Sent: Fri 2/1/2013 8:39 AM >>> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >>> Cc: basex-talk at mailman.uni-konstanz.de >>> Subject: Re: [basex-talk] Java User Function and Context Awareness >>> >>> Dear Jeff, >>> >>> Afair, UserFunc should never be evaluated when calling a Java >>> function. Do you have an sscce for demonstrating your use case? >>> >>> By extending the QueryModule class, you are getting access to all >>> internal query process information, and the current context is one of >>> them. As you already guessed, it can be retrieved via "context.value". >>> >>> Another alternative is to pass on the current context as argument.. >>> >>> Q{java:.....}func(.) >>> >>> Best, >>> Christian >>> ___________________________ >>> >>> On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV >>> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>>> It seems that there is no way for a Java user function installed in the >>>> Repository to get access to the current context node. >>>> Yes the context is available because of extending abstract QueryModule, >>>> but >>>> it seems the value of the current context node has been wiped out by the >>>> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >>>> actual user function [during line 175]. >>>> Is there some way for a user function to recover that value, or is this >>>> just >>>> a limitation of the user function mechanism? >>>> Thanks. >>>> >>>> _______________________________________________ >>>> BaseX-Talk mailing list >>>> BaseX-Talk at mailman.uni-konstanz.de >>>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>>

From: Christian Grün Sent: Fri 2/1/2013 10:32 AM To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 Cc: basex-talk at mailman.uni-konstanz.de Subject: Re: [basex-talk] Java User Function and Context Awareness Ok, got it.. The problem is that the wrapper.xq script is invoked before your Java code is called. The behavior is correct, as it would be illegal to preserve the current context item. The following example may clarify this: declare context item := <a/>; declare function local:x() { . }; ., try { local:x() } catch * { $err:code } As a solution, I'd recommend to either use our direct XQuery packaging mechanism or pass on the context value as argument to your query. Hope this helps, Christian On Fri, Feb 1, 2013 at 7:13 PM, Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: > Yes, you are seeing the output of the second XQuery, which calls > document-uri() for comparison. > But the first XQuery returned nothing (expected to see it return: > "test/hdl:okwffu/12345"). > Why? > It can only be because context.value was null (since every other path throws > an Exception). > > If you look in a debugger, you see that context.value had a DBNode value > until just before UserFunc.value() at line 170, which was just before the > metadata() function was called. > > ________________________________ > From: Christian Grün > Sent: Fri 2/1/2013 9:56 AM > > To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 > Cc: basex-talk at mailman.uni-konstanz.de > Subject: Re: [basex-talk] Java User Function and Context Awareness > > Your code outputs "test/12345" on my machine, so I'm not sure what's > the problem, or what you were expecting to get. > ___________________________ > > On Fri, Feb 1, 2013 at 6:47 PM, Lansing, Jeff J CIV > SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >> Sorry, wrong basex.xml. Here's the correct one: >> >> <package xmlns="http://www.basex.org/modules/pkg"> >> <jar>dbxml-module.jar</jar> >> <class>cnde.module.DbXml</class> >> </package> >> >> Ant build.xml: >> <project default="module" name="dbxml-module" basedir="."> >> <property name="base.name" value="dbxml-module"/> >> <property name="jar.name" value="${base.name}.jar"/> >> <path id="class.path"> >> <fileset dir="C:/xquery/basex"> >> <include name="BaseX.jar"/> >> </fileset> >> </path> >> <target name="compile"> >> <mkdir dir="build"/> >> <mkdir dir="build/classes"/> >> <javac destdir="./build/classes" classpathref="class.path" >> debug="true"> >> <src path="src"/> >> </javac> >> </target> >> <target name="jar" depends="compile"> >> <jar destfile="${jar.name}"> >> <fileset dir="./build/classes"> >> <include name="**/*.class"/> >> </fileset> >> <manifest> >> <attribute name="Main-Class" value="cnde.module.DbXml"/> >> </manifest> >> </jar> >> <delete dir="build"/> >> </target> >> <target name="module" depends="jar"> >> <zip destfile="${base.name}-1.0.0.xar"> >> <zipfileset dir="."> >> <include name="expath-pkg.xml"/> >> <include name="basex.xml"/> >> </zipfileset> >> <zipfileset dir="." prefix="dbxml"> >> <include name="wrapper.xq"/> >> <include name="${jar.name}"/> >> </zipfileset> >> </zip> >> <copy >> todir="C:\xquery\basex\repo\http-www.sleepycat.com-2002-dbxml-1.0.0\dbxml" >> file="${jar.name}"/> >> </target> >> </project> >> >> ________________________________ >> From: Christian Grün >> Sent: Fri 2/1/2013 9:30 AM >> >> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >> Cc: basex-talk at mailman.uni-konstanz.de >> Subject: Re: [basex-talk] Java User Function and Context Awareness >> >> Hm, doesn't look too self-contained (e.g., I can't find >> GraphContainment anywhere). For testing purposes, it may be easier to >> build a simple BaseX package and do EXPath in a next step (see [1] for >> more details). >> >> Thanks, >> Christian >> >> [1] http://docs.basex.org/wiki/Repository >> ___________________________ >> >> On Fri, Feb 1, 2013 at 6:22 PM, Lansing, Jeff J CIV >> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>> Yes, of course: >>> >>> package cnde.module; >>> import org.basex.core.Context; >>> import org.basex.core.cmd.Add; >>> import org.basex.core.cmd.CreateDB; >>> import org.basex.core.cmd.DropDB; >>> import org.basex.core.cmd.XQuery; >>> import org.junit.Test; >>> public class DbXmlTest { >>> >>> @Test >>> public void test() { >>> try { >>> Context context = new Context(); >>> // String result1 = new >>> >>> >>> XQuery("repo:install('C:\\Users\\jlansing\\workspaceTEST\\dbxml-module\\dbxml-module-1.0.0.xar')").execute(context); >>> // System.out.println(result1); >>> >>> new CreateDB("test").execute(context); >>> new Add("12345", "<doc><guid>12345</guid></doc>").execute(context); >>> String result = new XQuery("import module namespace >>> dbxml='http://www.sleepycat.com/2002/dbxml'; >>> >>> ((collection('test'))[1])/dbxml:metadata('dbxml:name')").execute(context); >>> String result2 = new >>> XQuery("((collection('test'))[1])/document-uri()").execute(context); >>> System.out.println(result + " " + result2); >>> new DropDB("test").execute(context); >>> >>> context.close(); >>> } catch(Exception e) { >>> e.printStackTrace(); >>> } >>> } >>> } >>> >>> >>> >>> ________________________________ >>> From: Christian Grün >>> Sent: Fri 2/1/2013 9:15 AM >>> >>> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >>> Cc: basex-talk at mailman.uni-konstanz.de >>> Subject: Re: [basex-talk] Java User Function and Context Awareness >>> >>> What's the query you are trying to run? >>> ___________________________ >>> >>> On Fri, Feb 1, 2013 at 6:07 PM, Lansing, Jeff J CIV >>> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>>> Java Source: >>>> package cnde.module; >>>> import org.basex.query.QueryException; >>>> import org.basex.query.QueryModule; >>>> import org.basex.query.iter.Iter; >>>> import org.basex.query.value.Value; >>>> import org.basex.query.value.item.Item; >>>> import org.basex.query.value.item.Uri; >>>> import org.basex.query.value.node.ANode; >>>> import org.basex.query.value.type.NodeType; >>>> public class DbXml extends QueryModule { >>>> >>>> @Requires(Permission.NONE) >>>> @ContextDependent >>>> @FocusDependent >>>> public String metadata(String qname) { >>>> try { >>>> Value val = context.value; >>>> if(val == null) { >>>> return null; >>>> } >>>> Item it = null; >>>> if(val.isItem()) { >>>> it = (Item)val; >>>> } else { >>>> throw new QueryException(val + " not an item"); >>>> } >>>> if(!(it instanceof ANode)) throw new QueryException(it + " not a >>>> node"); >>>> ANode node = (ANode)it; >>>> if(node.type != NodeType.DOC) return "node is not a document node"; >>>> final byte[] uri = node.baseURI(); >>>> String s = uri.length == 0 ? null : Uri.uri(uri, >>>> false).toString(); >>>> return s == null? "no uri for node" : s.replace("/", >>>> "/hdl:okwffu/"); >>>> } catch (QueryException e) { >>>> System.err.println(e); >>>> return e.getMessage(); >>>> } >>>> } >>>> } >>>> >>>> wrapper.xq: >>>> module namespace dbxml='http://www.sleepycat.com/2002/dbxml'; >>>> declare namespace p="java:cnde.module.DbXml"; >>>> declare function dbxml:metadata($key as xs:string) as xs:string* { >>>> let $meta := p:new() >>>> return p:metadata($meta, $key) >>>> }; >>>> >>>> basex.xml: >>>> <package xmlns="http://www.basex.org/modules/pkg"> >>>> <jar>containment.jar</jar> >>>> <class>cnde.service.operator.GraphContainment</class> >>>> </package> >>>> >>>> expath-pkg.xml: >>>> <package xmlns="http://expath.org/ns/pkg" >>>> name="http://www.sleepycat.com/2002/dbxml" abbrev="dbxml" >>>> version="1.0.0" >>>> spec="1.0"> >>>> <title>dbxml metadata</title> >>>> <dependency processor="basex"/> >>>> <xquery> >>>> <namespace>http://www.sleepycat.com/2002/dbxml</namespace> >>>> <file>wrapper.xq</file> >>>> </xquery> >>>> </package> >>>> >>>> ________________________________ >>>> From: Christian Grün >>>> Sent: Fri 2/1/2013 8:39 AM >>>> To: Lansing, Jeff J CIV SPAWARSYSCEN-PACIFIC, 56250 >>>> Cc: basex-talk at mailman.uni-konstanz.de >>>> Subject: Re: [basex-talk] Java User Function and Context Awareness >>>> >>>> Dear Jeff, >>>> >>>> Afair, UserFunc should never be evaluated when calling a Java >>>> function. Do you have an sscce for demonstrating your use case? >>>> >>>> By extending the QueryModule class, you are getting access to all >>>> internal query process information, and the current context is one of >>>> them. As you already guessed, it can be retrieved via "context.value". >>>> >>>> Another alternative is to pass on the current context as argument.. >>>> >>>> Q{java:.....}func(.) >>>> >>>> Best, >>>> Christian >>>> ___________________________ >>>> >>>> On Wed, Jan 30, 2013 at 6:40 PM, Lansing, Jeff J CIV >>>> SPAWARSYSCEN-PACIFIC, 56250 <jeff.lansing at navy.mil> wrote: >>>>> It seems that there is no way for a Java user function installed in >>>>> the >>>>> Repository to get access to the current context node. >>>>> Yes the context is available because of extending abstract QueryModule, >>>>> but >>>>> it seems the value of the current context node has been wiped out by >>>>> the >>>>> call from UserFunc.value() [at UserFunc:line 170] before it gets to the >>>>> actual user function [during line 175]. >>>>> Is there some way for a user function to recover that value, or is this >>>>> just >>>>> a limitation of the user function mechanism? >>>>> Thanks. >>>>> >>>>> _______________________________________________ >>>>> BaseX-Talk mailing list >>>>> BaseX-Talk at mailman.uni-konstanz.de >>>>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>>>