[jboss-user] [JBoss jBPM] - Re: bpws.getVariableData as predicate is not supported?

meghanai_99 do-not-reply at jboss.com
Tue Sep 11 21:09:00 EDT 2007

Here is what I had to do to get it working.

1. Change query.functions.xml as shown above.
2. Added overloaded method in QueryEvaluator and XPathQueryEvaluator

  | public Object evaluate(Node contextNode, Token token) {
  |     try {
  |       this.setVariableContext( new ScopeVariableContext(token));
  |       this.setFunctionContext( functionLibrary);     
  |       //TODO: if no where else, add method in SetNamespaceContext to add bpws.
  |       ((SetNamespaceContext)this.getNamespaceContext()).addNamespace( "bpws", "http://schemas.xmlsoap.org/ws/2003/03/business-process/");
  |       List nodeset = selectNodes(contextNode);
  |       return narrowToSingleNode(nodeset);
  |     }
  |     catch (JaxenException e) {
  |       throw new BpelFaultException(BpelConstants.FAULT_SUB_LANGUAGE_EXECUTION);
  |     }
  |   }

Note: The namespace context did not have 'bpws' prefix which I have hardcoded here, I will get to fixing that hack next. I added a method in SetNamespaceContext to add a namespace at a time if prefix doesn't exist already.

3. I call this new method in FromVariable.

  | value = query.getEvaluator().evaluate((Element) value, token);

4. Jaxen only allows 'number' or 'boolean' in predicate. With my original XPath, it was returning nodeset and getting resolved as boolean 'true'. So I had to wrap my 'getVariableData' call inside XPath 'number' function.

  | /ns9:GetItemsByQueryResponse/ns9:return[number(bpws:getVariableData("ForEach_index"))]/ns9:genericItem/ns9:itemID

This got my while loop working. 


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