Examples of net.sf.saxon.trace.TraceListener

net.sf.saxon.trace.TraceListener
This interface defines methods that are called by Saxon during the execution of a stylesheet, if tracing is switched on. Tracing can be switched on by nominating an implementation of this class using the TRACE_LISTENER feature of the TransformerFactory, or using the addTraceListener() method of the Controller, which is Saxon's implementation of tyhe JAXP javax.xml.transform.Transformer interface.

     * @return either null, or a tail call that the caller must invoke on return
     * @throws net.sf.saxon.trans.XPathException
     */
    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        TraceListener listener = controller.getTraceListener();
      if (controller.isTracing()) {
             listener.enter(getInstructionInfo(), context);
        }
        // Don't attempt tail call optimization when tracing, the results are too confusing
        child.process(context);
         if (controller.isTracing()) {
             listener.leave(getInstructionInfo());
        }
        return null;
    }

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        c2.setOrigin(this);
        c2.setCurrentIterator(iter);
        c2.setCurrentTemplateRule(null);


        if (controller.isTracing()) {
            TraceListener listener = controller.getTraceListener();
            while(true) {
                Item item = iter.next();
                if (item == null) {
                    break;
                }
                listener.startCurrentItem(item);
                action.process(c2);
                listener.endCurrentItem(item);
            }
        } else {
            while(true) {
                Item item = iter.next();
                if (item == null) {

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                                              // No need to open a new stack frame!
                    defaultAction(node, parameters, tunnelParameters, context, backwardsCompatible, locationId);


                } else {
                    Template template = (Template)rule.getAction();
                    TraceListener traceListener = controller.getTraceListener();
                    context.setLocalParameters(parameters);
                    context.setTunnelParameters(tunnelParameters);
                    context.openStackFrame(template.getStackFrameMap());
                    traceListener.startCurrentItem(node);
                    tc = template.applyLeavingTail(context, rule);
                    traceListener.endCurrentItem(node);
                }
            }


        } else {    // not tracing

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        controller.defineGlobalParameters();


        XPathContextMajor context = initialContext(env, controller);


        // In tracing/debugging mode, evaluate all the global variables first
        TraceListener tracer = controller.getConfiguration().getTraceListener();
        if (tracer != null) {
            controller.preEvaluateGlobals(context);
            tracer.open();
        }


        context.openStackFrame(stackFrameMap);


        boolean mustClose = (result instanceof StreamResult &&
                ((StreamResult)result).getOutputStream() == null);
        context.changeOutputDestination(actualProperties, result, true,
                Configuration.XQUERY, Validation.PRESERVE, null);
        context.getReceiver().open();


        // Run the query
        try {
            expression.process(context);
        } catch (XPathException err) {
            controller.reportFatalError(err);
            throw err;
        }


        if (tracer != null) {
            tracer.close();
        }


        context.getReceiver().close();
        if (mustClose) {
            OutputStream os = ((StreamResult)result).getOutputStream();

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net.sf.saxon.Controller

net.sf.saxon.functions.Trace

net.sf.saxon.instruct.ApplyTemplates

net.sf.saxon.instruct.ForEach

net.sf.saxon.instruct.ForEachGroup

net.sf.saxon.instruct.TraceWrapper

net.sf.saxon.Query

net.sf.saxon.query.XQueryExpression

net.sf.saxon.Transform

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