/******************************************************************************
* JBoss, a division of Red Hat *
* Copyright 2006, Red Hat Middleware, LLC, and individual *
* contributors as indicated by the @authors tag. See the *
* copyright.txt in the distribution for a full listing of *
* individual contributors. *
* *
* This is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation; either version 2.1 of *
* the License, or (at your option) any later version. *
* *
* This software is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this software; if not, write to the Free *
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *
* 02110-1301 USA, or see the FSF site: http://www.fsf.org. *
******************************************************************************/
package org.jboss.portal.portlet.impl.jsr168.api;
import javax.portlet.filter.PortletFilter;
import javax.portlet.filter.ActionFilter;
import javax.portlet.filter.ResourceFilter;
import javax.portlet.filter.RenderFilter;
import javax.portlet.filter.EventFilter;
import javax.portlet.filter.FilterChain;
import javax.portlet.PortletException;
import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.ResourceRequest;
import javax.portlet.ResourceResponse;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.EventRequest;
import javax.portlet.EventResponse;
import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;
import java.io.IOException;
import java.util.List;
/**
* @author <a href="mailto:julien@jboss.org">Julien Viet</a>
* @version $Revision: 630 $
*/
public class FilterChainImpl<T extends PortletFilter> implements FilterChain
{
/** . */
private List<T> filters;
/** . */
private Class<T> phase;
/** . */
private int index;
public FilterChainImpl(List<T> filters, Class<T> phase)
{
this.filters = filters;
this.phase = phase;
this.index = 0;
}
public void doFilter(PortletRequest req, PortletResponse resp) throws IOException, PortletException
{
if (req instanceof ActionRequest && resp instanceof ActionResponse)
{
doFilter((ActionRequest)req, (ActionResponse)resp);
}
else if (req instanceof EventRequest && resp instanceof EventResponse)
{
doFilter((EventRequest)req, (EventResponse)resp);
}
else if (req instanceof RenderRequest && resp instanceof RenderResponse)
{
doFilter((RenderRequest)req, (RenderResponse)resp);
}
else if (req instanceof ResourceRequest && resp instanceof ResourceResponse)
{
doFilter((ResourceRequest)req, (ResourceResponse)resp);
}
else
{
throw new IllegalArgumentException();
}
}
public void doFilter(ActionRequest req, ActionResponse resp) throws IOException, PortletException
{
if (!ActionFilter.class.isAssignableFrom(phase))
{
throw new IllegalStateException();
}
if (index >= filters.size())
{
throw new IllegalStateException();
}
//
int currentIndex = index++;
try
{
PortletFilter filter = filters.get(currentIndex);
ActionFilter actionFilter = ActionFilter.class.cast(filter);
actionFilter.doFilter(req, resp, this);
}
finally
{
index--;
}
}
public void doFilter(EventRequest req, EventResponse resp) throws IOException, PortletException
{
if (!EventFilter.class.isAssignableFrom(phase))
{
throw new IllegalStateException();
}
if (index >= filters.size())
{
throw new IllegalStateException();
}
//
int currentIndex = index++;
try
{
PortletFilter filter = filters.get(currentIndex);
EventFilter eventFilter = EventFilter.class.cast(filter);
eventFilter.doFilter(req, resp, this);
}
finally
{
index--;
}
}
public void doFilter(RenderRequest req, RenderResponse resp) throws IOException, PortletException
{
if (!RenderFilter.class.isAssignableFrom(phase))
{
throw new IllegalStateException();
}
if (index >= filters.size())
{
throw new IllegalStateException();
}
//
int currentIndex = index++;
try
{
PortletFilter filter = filters.get(currentIndex);
RenderFilter renderFilter = RenderFilter.class.cast(filter);
renderFilter.doFilter(req, resp, this);
}
finally
{
index--;
}
}
public void doFilter(ResourceRequest req, ResourceResponse resp) throws IOException, PortletException
{
if (!ResourceFilter.class.isAssignableFrom(phase))
{
throw new IllegalStateException();
}
if (index >= filters.size())
{
throw new IllegalStateException();
}
//
int currentIndex = index++;
try
{
PortletFilter filter = filters.get(currentIndex);
ResourceFilter resourceFilter = ResourceFilter.class.cast(filter);
resourceFilter.doFilter(req, resp, this);
}
finally
{
index--;
}
}
}