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

Sat, 17 Jan 2004 04:35:21 -0800

Dmitri Plotnikov wrote:
Joern,

The last() function is now fixed.
thanks so much. i tried to debug it myself but got lost in the contexts ;)

Joern

- 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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