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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: TraceManager.java 468644 2006-10-28 06:56:42Z minchau $
*/
package org.apache.xalan.trace;
import java.lang.reflect.Method;
import java.util.TooManyListenersException;
import java.util.Vector;
import org.apache.xalan.templates.ElemTemplateElement;
import org.apache.xalan.transformer.TransformerImpl;
import org.apache.xpath.XPath;
import org.apache.xpath.objects.XObject;
import org.w3c.dom.Node;
/**
* This class manages trace listeners, and acts as an
* interface for the tracing functionality in Xalan.
*/
public class TraceManager
{
/** A transformer instance */
private TransformerImpl m_transformer;
/**
* Constructor for the trace manager.
*
* @param transformer a non-null instance of a transformer
*/
public TraceManager(TransformerImpl transformer)
{
m_transformer = transformer;
}
/**
* List of listeners who are interested in tracing what's
* being generated.
*/
private Vector m_traceListeners = null;
/**
* Add a trace listener for the purposes of debugging and diagnosis.
* @param tl Trace listener to be added.
*
* @throws TooManyListenersException
*/
public void addTraceListener(TraceListener tl)
throws TooManyListenersException
{
m_transformer.setDebug(true);
if (null == m_traceListeners)
m_traceListeners = new Vector();
m_traceListeners.addElement(tl);
}
/**
* Remove a trace listener.
* @param tl Trace listener to be removed.
*/
public void removeTraceListener(TraceListener tl)
{
if (null != m_traceListeners)
{
m_traceListeners.removeElement(tl);
// The following line added to fix the bug#5140: hasTraceListeners() returns true
// after adding and removing a listener.
// Check: if m_traceListeners is empty, then set it to NULL.
if (0 == m_traceListeners.size()) m_traceListeners = null;
}
}
/**
* Fire a generate event.
*
* @param te Generate Event to fire
*/
public void fireGenerateEvent(GenerateEvent te)
{
if (null != m_traceListeners)
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
tl.generated(te);
}
}
}
/**
* Tell if trace listeners are present.
*
* @return True if there are trace listeners
*/
public boolean hasTraceListeners()
{
return (null != m_traceListeners);
}
/**
* Fire a trace event.
*
* @param styleNode Stylesheet template node
*/
public void fireTraceEvent(ElemTemplateElement styleNode)
{
if (hasTraceListeners())
{
int sourceNode = m_transformer.getXPathContext().getCurrentNode();
Node source = getDOMNodeFromDTM(sourceNode);
fireTraceEvent(new TracerEvent(m_transformer, source,
m_transformer.getMode(), /*sourceNode, mode,*/
styleNode));
}
}
/**
* Fire a end trace event, after all children of an element have been
* executed.
*
* @param styleNode Stylesheet template node
*/
public void fireTraceEndEvent(ElemTemplateElement styleNode)
{
if (hasTraceListeners())
{
int sourceNode = m_transformer.getXPathContext().getCurrentNode();
Node source = getDOMNodeFromDTM(sourceNode);
fireTraceEndEvent(new TracerEvent(m_transformer, source,
m_transformer.getMode(), /*sourceNode, mode,*/
styleNode));
}
}
/**
* Fire a trace event.
*
* @param te Trace event to fire
*/
public void fireTraceEndEvent(TracerEvent te)
{
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
if(tl instanceof TraceListenerEx2)
{
((TraceListenerEx2)tl).traceEnd(te);
}
}
}
}
/**
* Fire a trace event.
*
* @param te Trace event to fire
*/
public void fireTraceEvent(TracerEvent te)
{
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
tl.trace(te);
}
}
}
/**
* Fire a selection event.
*
* @param sourceNode Current source node
* @param styleNode node in the style tree reference for the event.
* @param attributeName The attribute name from which the selection is made.
* @param xpath The XPath that executed the selection.
* @param selection The result of the selection.
*
* @throws javax.xml.transform.TransformerException
*/
public void fireSelectedEvent(
int sourceNode, ElemTemplateElement styleNode, String attributeName,
XPath xpath, XObject selection)
throws javax.xml.transform.TransformerException
{
if (hasTraceListeners())
{
Node source = getDOMNodeFromDTM(sourceNode);
fireSelectedEvent(new SelectionEvent(m_transformer, source, styleNode,
attributeName, xpath, selection));
}
}
/**
* Fire a selection event.
*
* @param sourceNode Current source node
* @param styleNode node in the style tree reference for the event.
* @param attributeName The attribute name from which the selection is made.
* @param xpath The XPath that executed the selection.
* @param selection The result of the selection.
*
* @throws javax.xml.transform.TransformerException
*/
public void fireSelectedEndEvent(
int sourceNode, ElemTemplateElement styleNode, String attributeName,
XPath xpath, XObject selection)
throws javax.xml.transform.TransformerException
{
if (hasTraceListeners())
{
Node source = getDOMNodeFromDTM(sourceNode);
fireSelectedEndEvent(new EndSelectionEvent(m_transformer, source, styleNode,
attributeName, xpath, selection));
}
}
/**
* Fire a selection event.
*
* @param se Selection event to fire
*
* @throws javax.xml.transform.TransformerException
*/
public void fireSelectedEndEvent(EndSelectionEvent se)
throws javax.xml.transform.TransformerException
{
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
if(tl instanceof TraceListenerEx)
((TraceListenerEx)tl).selectEnd(se);
}
}
}
/**
* Fire a selection event.
*
* @param se Selection event to fire
*
* @throws javax.xml.transform.TransformerException
*/
public void fireSelectedEvent(SelectionEvent se)
throws javax.xml.transform.TransformerException
{
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
tl.selected(se);
}
}
}
/**
* Fire an end extension event.
*
* @see java.lang.reflect.Method#invoke
*
* @param method The java method about to be executed
* @param instance The instance the method will be executed on
* @param arguments Parameters passed to the method.
*/
public void fireExtensionEndEvent(Method method, Object instance, Object[] arguments)
{
ExtensionEvent ee = new ExtensionEvent(m_transformer, method, instance, arguments);
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
if(tl instanceof TraceListenerEx3)
{
((TraceListenerEx3)tl).extensionEnd(ee);
}
}
}
}
/**
* Fire an end extension event.
*
* @see java.lang.reflect.Method#invoke
*
* @param method The java method about to be executed
* @param instance The instance the method will be executed on
* @param arguments Parameters passed to the method.
*/
public void fireExtensionEvent(Method method, Object instance, Object[] arguments)
{
ExtensionEvent ee = new ExtensionEvent(m_transformer, method, instance, arguments);
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
if(tl instanceof TraceListenerEx3)
{
((TraceListenerEx3)tl).extension(ee);
}
}
}
}
/**
* Fire an end extension event.
*
* @see java.lang.reflect.Method#invoke
*
* @param ee the ExtensionEvent to fire
*/
public void fireExtensionEndEvent(ExtensionEvent ee)
{
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
if(tl instanceof TraceListenerEx3)
{
((TraceListenerEx3)tl).extensionEnd(ee);
}
}
}
}
/**
* Fire an end extension event.
*
* @see java.lang.reflect.Method#invoke
*
* @param ee the ExtensionEvent to fire
*/
public void fireExtensionEvent(ExtensionEvent ee)
{
if (hasTraceListeners())
{
int nListeners = m_traceListeners.size();
for (int i = 0; i < nListeners; i++)
{
TraceListener tl = (TraceListener) m_traceListeners.elementAt(i);
if(tl instanceof TraceListenerEx3)
{
((TraceListenerEx3)tl).extension(ee);
}
}
}
}
/**
* Get the DOM Node of the current XPath context, which is possibly null.
* @param sourceNode the handle on the node used by a DTM.
*/
private Node getDOMNodeFromDTM(int sourceNode) {
org.apache.xml.dtm.DTM dtm = m_transformer.getXPathContext().getDTM(sourceNode);
final Node source = (dtm == null) ? null : dtm.getNode(sourceNode);
return source;
}
}
