org.apache.xalan.trace

## Class PrintTraceListener

- java.lang.Object
- - org.apache.xalan.trace.PrintTraceListener

- All Implemented Interfaces:
    java.util.EventListener, TraceListener, TraceListenerEx, TraceListenerEx2, TraceListenerEx3

      public class PrintTraceListener
      extends java.lang.Object
      implements TraceListenerEx3

  Implementation of the TraceListener interface that prints each event to standard out as it occurs.
  See Also:
    `TracerEvent`
  Usage:
    **For advanced use only**

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `boolean` | `m_traceElements` Set to true if the listener is to print events that occur as each node is 'executed' in the stylesheet.
    `boolean` | `m_traceExtension` Set to true if the listener is to print information after each extension event.
    `boolean` | `m_traceGeneration` Set to true if the listener is to print information after each result-tree generation event.
    `boolean` | `m_traceSelection` Set to true if the listener is to print information after each selection event.
    `boolean` | `m_traceTemplates` This needs to be set to true if the listener is to print an event whenever a template is invoked.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PrintTraceListener(java.io.PrintWriter pw)` Construct a trace listener.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `_trace(TracerEvent ev)` Print information about a TracerEvent.
    `void` | `extension(ExtensionEvent ev)` Print information about an extension event.
    `void` | `extensionEnd(ExtensionEvent ev)` Print information about an extension event.
    `void` | `generated(GenerateEvent ev)` Print information about a Generate event.
    `void` | `selected(SelectionEvent ev)` Method that is called just after a select attribute has been evaluated.
    `void` | `selectEnd(EndSelectionEvent ev)` Method that is called after an xsl:apply-templates or xsl:for-each selection occurs.
    `void` | `trace(TracerEvent ev)` Print information about a TracerEvent.
    `void` | `traceEnd(TracerEvent ev)` Method that is called when the end of a trace event occurs.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### m_traceTemplates

          public boolean m_traceTemplates

      This needs to be set to true if the listener is to print an event whenever a template is invoked.

    - #### m_traceElements

          public boolean m_traceElements

      Set to true if the listener is to print events that occur as each node is 'executed' in the stylesheet.

    - #### m_traceGeneration

          public boolean m_traceGeneration

      Set to true if the listener is to print information after each result-tree generation event.

    - #### m_traceSelection

          public boolean m_traceSelection

      Set to true if the listener is to print information after each selection event.

    - #### m_traceExtension

          public boolean m_traceExtension

      Set to true if the listener is to print information after each extension event.

  - ### Constructor Detail

    - #### PrintTraceListener

          public PrintTraceListener(java.io.PrintWriter pw)

      Construct a trace listener.
      Parameters:
        `pw` - PrintWriter to use for tracing events

  - ### Method Detail

    - #### _trace

          public void _trace(TracerEvent ev)

      Print information about a TracerEvent.
      Parameters:
        `ev` - the trace event.

    - #### trace

          public void trace(TracerEvent ev)

      Print information about a TracerEvent.
      Specified by:
        `trace` in interface `TraceListener`
      Parameters:
        `ev` - the trace event.

    - #### traceEnd

          public void traceEnd(TracerEvent ev)

      Method that is called when the end of a trace event occurs. The method is blocking. It must return before processing continues.
      Specified by:
        `traceEnd` in interface `TraceListenerEx2`
      Parameters:
        `ev` - the trace event.

    - #### selected

          public void selected(SelectionEvent ev)
                        throws TransformerException

      Method that is called just after a select attribute has been evaluated.
      Specified by:
        `selected` in interface `TraceListener`
      Parameters:
        `ev` - the generate event.
      Throws:
        `TransformerException`

    - #### selectEnd

          public void selectEnd(EndSelectionEvent ev)
                         throws TransformerException

      Method that is called after an xsl:apply-templates or xsl:for-each selection occurs.
      Specified by:
        `selectEnd` in interface `TraceListenerEx`
      Parameters:
        `ev` - the generate event.
      Throws:
        `TransformerException`

    - #### generated

          public void generated(GenerateEvent ev)

      Print information about a Generate event.
      Specified by:
        `generated` in interface `TraceListener`
      Parameters:
        `ev` - the trace event.

    - #### extension

          public void extension(ExtensionEvent ev)

      Print information about an extension event.
      Specified by:
        `extension` in interface `TraceListenerEx3`
      Parameters:
        `ev` - the extension event to print information about

    - #### extensionEnd

          public void extensionEnd(ExtensionEvent ev)

      Print information about an extension event.
      Specified by:
        `extensionEnd` in interface `TraceListenerEx3`
      Parameters:
        `ev` - the extension event to print information about

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