Re: [jxpath] using the last() function? (repost)

Joern,

The last() function is now fixed.

- Dmitri

----- Original Message ----- 
From: "joern turner" <[email protected]>
To: "Jakarta Commons Users List" <[email protected]>
Sent: Sunday, January 04, 2004 7:02 PM
Subject: [jxpath] using the last() function? (repost)


> Hello,
>
> first of all, thanks for this great piece of code - its a vital part of
> our own open-source project.
>
> but i have a problem using the last() function in jxpath. i'm using the
> following xml:
>
> <instance>
>    <my:order my:money="4711">
>      <my:item my:money="50">
>        <my:amount>500</my:amount>
>        <my:discount>100</my:discount>
>      </my:item>
>      <my:item my:money="4711">
>        <my:amount>77</my:amount>
>        <my:discount>77</my:discount>
>      </my:item>
>    </my:order>
> </instance>
>
> i'm trying to get the last element of a nodeset like this:
>
> JXPathContext context = JXPathContext.newContext(doc);
>
> Pointer pointer1 = context.getPointer("//my:order/my:item[2]");
>
assertTrue(pointer1.asPath().equals("/instance[1]/my:order[1]/my:item[2]"));
>
> works ok.
>
> Pointer pointer2
>    =context.getPointer("//my:order/my:item[position()=count(../*)]");
>
assertTrue(pointer2.asPath().equals("/instance[1]/my:order[1]/my:item[2]"));
>
> works ok.
>
> Pointer pointer3 =
>    context.getPointer("//my:order/my:item[position()=2]");
>
assertTrue(pointer3.asPath().equals("/instance[1]/my:order[1]/my:item[2]"));
>
> works ok.
>
> Pointer pointer4 = context.getPointer("//my:order/my:item[last()]");
>
assertTrue(pointer4.asPath().equals("/instance[1]/my:order[1]/my:item[2]"));
>
> fails with stacktrace. what am i doing wrong? please help. i've
> investigated the problem but cannot find a way to get it working.
>
> any help appreaciated.
>
> Joern
>
>
testLast(org.chiba.xml.xforms.xpath.test.JXPathTest)java.lang.NullPointerExc
eption
>      at
>
org.apache.commons.jxpath.ri.model.dom.DOMNodeIterator.previous(DOMNodeItera
tor.java:131)
>      at
>
org.apache.commons.jxpath.ri.model.dom.DOMNodeIterator.setPosition(DOMNodeIt
erator.java:121)
>      at
>
org.apache.commons.jxpath.ri.axes.ChildContext.setPosition(ChildContext.java
:152)
>      at
>
org.apache.commons.jxpath.ri.compiler.CoreFunction.functionLast(CoreFunction
.java:335)
>      at
>
org.apache.commons.jxpath.ri.compiler.CoreFunction.computeValue(CoreFunction
.java:259)
>      at
>
org.apache.commons.jxpath.ri.axes.PredicateContext.nextNode(PredicateContext
.java:127)
>      at
>
org.apache.commons.jxpath.ri.EvalContext.getSingleNodePointer(EvalContext.ja
va:333)
>      at
> org.apache.commons.jxpath.ri.compiler.Path.searchForPath(Path.java:211)
>      at
>
org.apache.commons.jxpath.ri.compiler.Path.getSingleNodePointerForSteps(Path
.java:192)
>      at
>
org.apache.commons.jxpath.ri.compiler.LocationPath.computeValue(LocationPath
.java:128)
>      at
>
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getPointer(JXPathCon
textReferenceImpl.java:366)
>      at
>
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getPointer(JXPathCon
textReferenceImpl.java:362)
>      at
> org.chiba.xml.xforms.xpath.test.JXPathTest.testLast(JXPathTest.java:162)
>      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>      at
>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
>      at
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
>      at
>
com.intellij.rt.execution.junit.TextTestRunner.main(TextTestRunner.java:12)
>
>
>
>
>
>
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