freemarker.ext.jsp.EventForwarding Maven / Gradle / Ivy
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FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.ext.jsp;
import java.util.ArrayList;
import java.util.EventListener;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextAttributeEvent;
import javax.servlet.ServletContextAttributeListener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import freemarker.log.Logger;
/**
* An instance of this class should be registered as a <listener> in
* the web.xml descriptor in order to correctly dispatch events to
* event listeners that are specified in TLD files.
* @author Attila Szegedi
* @version $Id: EventForwarding.java,v 1.5 2003/01/24 10:19:33 szegedia Exp $
*/
public class EventForwarding
implements
ServletContextAttributeListener,
ServletContextListener,
HttpSessionListener,
HttpSessionAttributeListener
{
private static final Logger logger = Logger.getLogger("freemarker.jsp");
private static final String ATTR_NAME = EventForwarding.class.getName();
private final List servletContextAttributeListeners = new ArrayList();
private final List servletContextListeners = new ArrayList();
private final List httpSessionAttributeListeners = new ArrayList();
private final List httpSessionListeners = new ArrayList();
void addListeners(List listeners)
{
for (Iterator iter = listeners.iterator(); iter.hasNext();)
{
addListener((EventListener)iter.next());
}
}
private void addListener(EventListener listener)
{
boolean added = false;
if(listener instanceof ServletContextAttributeListener)
{
addListener(servletContextAttributeListeners, listener);
added = true;
}
if(listener instanceof ServletContextListener)
{
addListener(servletContextListeners, listener);
added = true;
}
if(listener instanceof HttpSessionAttributeListener)
{
addListener(httpSessionAttributeListeners, listener);
added = true;
}
if(listener instanceof HttpSessionListener)
{
addListener(httpSessionListeners, listener);
added = true;
}
if(!added) {
logger.warn(
"Listener of class " + listener.getClass().getName() +
"wasn't registered as it doesn't implement any of the " +
"recognized listener interfaces.");
}
}
static EventForwarding getInstance(ServletContext context)
{
return (EventForwarding)context.getAttribute(ATTR_NAME);
}
private void addListener(List listeners, EventListener listener)
{
synchronized(listeners)
{
listeners.add(listener);
}
}
public void attributeAdded(ServletContextAttributeEvent arg0)
{
synchronized(servletContextAttributeListeners)
{
int s = servletContextAttributeListeners.size();
for(int i = 0; i < s; ++i)
{
((ServletContextAttributeListener)servletContextAttributeListeners.get(i)).attributeAdded(arg0);
}
}
}
public void attributeRemoved(ServletContextAttributeEvent arg0)
{
synchronized(servletContextAttributeListeners)
{
int s = servletContextAttributeListeners.size();
for(int i = 0; i < s; ++i)
{
((ServletContextAttributeListener)servletContextAttributeListeners.get(i)).attributeRemoved(arg0);
}
}
}
public void attributeReplaced(ServletContextAttributeEvent arg0)
{
synchronized(servletContextAttributeListeners)
{
int s = servletContextAttributeListeners.size();
for(int i = 0; i < s; ++i)
{
((ServletContextAttributeListener)servletContextAttributeListeners.get(i)).attributeReplaced(arg0);
}
}
}
public void contextInitialized(ServletContextEvent arg0)
{
arg0.getServletContext().setAttribute(ATTR_NAME, this);
synchronized(servletContextListeners)
{
int s = servletContextListeners.size();
for(int i = 0; i < s; ++i)
{
((ServletContextListener)servletContextListeners.get(i)).contextInitialized(arg0);
}
}
}
public void contextDestroyed(ServletContextEvent arg0)
{
synchronized(servletContextListeners)
{
int s = servletContextListeners.size();
for(int i = s - 1; i >= 0; --i)
{
((ServletContextListener)servletContextListeners.get(i)).contextDestroyed(arg0);
}
}
}
public void sessionCreated(HttpSessionEvent arg0)
{
synchronized(httpSessionListeners)
{
int s = httpSessionListeners.size();
for(int i = 0; i < s; ++i)
{
((HttpSessionListener)httpSessionListeners.get(i)).sessionCreated(arg0);
}
}
}
public void sessionDestroyed(HttpSessionEvent arg0)
{
synchronized(httpSessionListeners)
{
int s = httpSessionListeners.size();
for(int i = s - 1; i >= 0; --i)
{
((HttpSessionListener)httpSessionListeners.get(i)).sessionDestroyed(arg0);
}
}
}
public void attributeAdded(HttpSessionBindingEvent arg0)
{
synchronized(httpSessionAttributeListeners)
{
int s = httpSessionAttributeListeners.size();
for(int i = 0; i < s; ++i)
{
((HttpSessionAttributeListener)httpSessionAttributeListeners.get(i)).attributeAdded(arg0);
}
}
}
public void attributeRemoved(HttpSessionBindingEvent arg0)
{
synchronized(httpSessionAttributeListeners)
{
int s = httpSessionAttributeListeners.size();
for(int i = 0; i < s; ++i)
{
((HttpSessionAttributeListener)httpSessionAttributeListeners.get(i)).attributeRemoved(arg0);
}
}
}
public void attributeReplaced(HttpSessionBindingEvent arg0)
{
synchronized(httpSessionAttributeListeners)
{
int s = httpSessionAttributeListeners.size();
for(int i = 0; i < s; ++i)
{
((HttpSessionAttributeListener)httpSessionAttributeListeners.get(i)).attributeReplaced(arg0);
}
}
}
}