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Using Xalan-J with JDOM?

Posted on 2006-07-10
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JDOM allows you to use XPath but the default XPath processor is Jaxen.  How would I go about using Xalan-J from Apache instead?
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Question by:ctangent
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enachemc earned 250 total points
ID: 17079900
In order to change JAXP(main interfaces regarding XML processing) implementations, you have to set system properties.

System property Setting for javax.xml.transform.TransformerFactory set to org.apache.xalan.processor.TransformerFactoryImpl , will mean that the XML transformer used is that from xalan. You can change in this way the DOM parser, SAX parser, XPath implementation, aso. System variable are usualy set using the "-D" option (-Djavax.xml.transform.TransformerFactory=org.apache.xalan.processor.TransformerFactoryImpl) as a parameter for starting the JVM. In order to set the XPathFactory, you would have to set the corresponding system property (javax.xml.xpath.XPathFactory) to your desired implementation.
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by:ctangent
ID: 17082067

In the class org.jdom.xpath.XPath, there is a function:

static void       setXPathClass(java.lang.Class aClass)
          Sets the concrete XPath subclass to use when allocating XPath instances.

from: http://www.jdom.org/docs/apidocs/org/jdom/xpath/XPath.html


I want to clarify, what I would like to do is use xpath calls with JDOM, so that:

for XML doc:

<appxml>
  <function name="test">1</function>
  <function name="foo">2</function>
</appxml>

Instead of doing:

List funcs = root.getChildren("function");
Iterator i = funcs.iterator();

Element fooFunc;
while(i.hasNext()){
  Element e = (Element) i.next();
  if(e.getAttributeValue("name").equals("foo"))
    fooFunc = e;
}

I can do:
Element fooFunc = (Element) XPath.selectSingleNode(this.root,"function[@name='foo']");



From this clarification, does your suggestion still stand?  Should I ignore the JDOM XPath function setXPathClass(java.lang.Class aClass)
JDOM defaults to using Jaxen as it's XPath parser, which is not good if I want to use Xalan-J
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Expert Comment

by:enachemc
ID: 17082213
My suggestion reffers only to the XPath implementation. The results should be the SAME ON ANY IMPLEMENTATION. If this is not the case, then it means that particular implementation does not respect W3C. My suggestion still stands (you should select the XPath implementation using A JVM system property).

Your code snippet seems correct.
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Author Comment

by:ctangent
ID: 17082273
enachemc, thank you very much for your help!
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