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## org.apache.xalan.trace
Interface TraceListener

All Known Subinterfaces:
  TraceListenerEx, TraceListenerEx2

public interface TraceListener
extends java.util.EventListener

**For advanced use only** Interface the XSL processor calls when it matches a source node, selects a set of source nodes, or generates a result node. If you want an object instance to be called when a trace event occurs, use the TransformerImpl setTraceListener method.

See Also:
  `TracerEvent`, `TraceManager.addTraceListener(org.apache.xalan.trace.TraceListener)`

Method Summary
`void` | `generated(GenerateEvent ev)` Method that is called just after the formatter listener is called.
`void` | `selected(SelectionEvent ev)` Method that is called just after the formatter listener is called.
`void` | `trace(TracerEvent ev)` Method that is called when a trace event occurs.

Method Detail

### trace

    public void trace(TracerEvent ev)

  Method that is called when a trace event occurs. The method is blocking. It must return before processing continues.
  Parameters:
    `ev` - the trace event.

### selected

    public void selected(SelectionEvent ev)
                  throws TransformerException

  Method that is called just after the formatter listener is called.
  Parameters:
    `ev` - the generate event.
  Throws:
    TransformerException -

### generated

    public void generated(GenerateEvent ev)

  Method that is called just after the formatter listener is called.
  Parameters:
    `ev` - the generate event.

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