How to pass DOM Document created using Axiom to evaluate XPath in Psychopath processor

Question

Currently Psychopath Xpath processor uses XercesLoader class to load bytestream and create org.w3c.dom.Document and it can be passed to evaluate the Xpath.

 InputStream is = new FileInputStream("resources/test.xml");
 DOMLoader loader = new XercesLoader(); 
 Document doc = loader.load(is);

I created org.w3c.dom.Document using axiom and passed it to Psychopath.

    InputStream is = new FileInputStream("resources/test.xml");

    OMMetaFactory omMetaFactory = OMAbstractFactory.getMetaFactory(OMAbstractFactory.FEATURE_DOM);
    OMFactory omFac = omMetaFactory.getOMFactory();
    OMXMLParserWrapper wrapper = OMXMLBuilderFactory.createOMBuilder(omFac, is) ;
    Document doc = (Document) wrapper.getDocument(); 

But when passing doc2 it gives the error

Exception in thread "main" org.w3c.dom.DOMException: NOT_SUPPORTED_ERR: The implementation does not support the requested type of object or operation. at org.apache.axiom.om.impl.dom.DOMUtil.newDOMException(DOMUtil.java:82) at org.apache.axiom.om.impl.dom.NodeImpl.compareDocumentPosition(NodeImpl.java:212) at org.eclipse.wst.xml.xpath2.processor.internal.types.NodeType.compare_node(NodeType.java:219) at org.eclipse.wst.xml.xpath2.processor.internal.types.NodeType.access$0(NodeType.java:207) at org.eclipse.wst.xml.xpath2.processor.internal.types.NodeType$1.compare(NodeType.java:64) at java.util.TreeMap.put(TreeMap.java:545) at java.util.TreeSet.add(TreeSet.java:255) at java.util.AbstractCollection.addAll(AbstractCollection.java:342) at java.util.TreeSet.addAll(TreeSet.java:312) at org.eclipse.wst.xml.xpath2.processor.internal.types.NodeType.linarize(NodeType.java:415) at org.eclipse.wst.xml.xpath2.processor.DefaultEvaluator.do_step(DefaultEvaluator.java:1165) at org.eclipse.wst.xml.xpath2.processor.DefaultEvaluator.visit(DefaultEvaluator.java:1249) at org.eclipse.wst.xml.xpath2.processor.internal.ast.XPathExpr.accept(XPathExpr.java:43) at org.eclipse.wst.xml.xpath2.processor.DefaultEvaluator.do_expr(DefaultEvaluator.java:337) at org.eclipse.wst.xml.xpath2.processor.DefaultEvaluator.visit(DefaultEvaluator.java:366) at org.eclipse.wst.xml.xpath2.processor.ast.XPath.accept(XPath.java:58) at org.eclipse.wst.xml.xpath2.processor.DefaultEvaluator.evaluate2(DefaultEvaluator.java:325) at org.eclipse.wst.xml.xpath2.processor.ast.XPath.evaluate(XPath.java:131) at psychopath.main(psychopath.java:85)

Needs an explanation. How to pass the DOM Document instance made using axiom to Psychopath to evaluate XPath?

Answer 1

The explanation is simple: Axiom's DOM implementation doesn't implement the compareDocumentPosition method (defined by DOM 3).