filterchainimpl.java

portal越来越流行了

/*
 * 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.
 */
package org.apache.pluto.driver.services.container;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.EventPortlet;
import javax.portlet.EventRequest;
import javax.portlet.EventResponse;
import javax.portlet.Portlet;
import javax.portlet.PortletContext;
import javax.portlet.PortletException;
import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.ResourceRequest;
import javax.portlet.ResourceResponse;
import javax.portlet.ResourceServingPortlet;
import javax.portlet.filter.ActionFilter;
import javax.portlet.filter.EventFilter;
import javax.portlet.filter.FilterChain;
import javax.portlet.filter.RenderFilter;
import javax.portlet.filter.ResourceFilter;

import org.apache.pluto.om.portlet.Filter;

/**
 * A <code>FilterChain</code> is an object provided by the portlet container 
 * to the developer giving a view into the invocation chain of a 
 * filtered request for a portlet. Filters use the <code>FilterChain</code> 
 * to invoke the next filter in the chain, or if the calling filter is the 
 * last filter in the chain, to invoke the portlet at the end of the chain.
 *@since 29/05/2007
 *@version 2.0
 */
public class FilterChainImpl implements FilterChain {

	private List<Filter> filterList = new ArrayList<Filter>();
	private String lifeCycle;
	Portlet portlet;
	EventPortlet eventPortlet;
	ResourceServingPortlet resourceServingPortlet;
	ClassLoader loader;
	PortletContext portletContext;
	int filterListIndex = 0;

	public FilterChainImpl(String lifeCycle){
		this.lifeCycle = lifeCycle;
	}
	public void processFilter(PortletRequest req, PortletResponse res, ClassLoader loader, EventPortlet eventPortlet, PortletContext portletContext) throws IOException, PortletException{
		this.eventPortlet = eventPortlet;
		this.loader = loader;
		this.portletContext = portletContext;
		doFilter((EventRequest)req,(EventResponse) res);
	}
	public void processFilter(PortletRequest req, PortletResponse res, ClassLoader loader, ResourceServingPortlet resourceServingPortlet, PortletContext portletContext) throws IOException, PortletException{
		this.resourceServingPortlet = resourceServingPortlet;
		this.loader = loader;
		this.portletContext = portletContext;
		doFilter((ResourceRequest)req,(ResourceResponse) res);
	}
	
	public void processFilter(PortletRequest req, PortletResponse res, ClassLoader loader, Portlet portlet, PortletContext portletContext) throws IOException, PortletException{
		this.portlet = portlet;
		this.loader = loader;
		this.portletContext = portletContext;
		if (lifeCycle.equals(PortletRequest.ACTION_PHASE)){
			doFilter((ActionRequest)req,(ActionResponse) res);
		}
		else if (lifeCycle.equals(PortletRequest.RENDER_PHASE)){
			doFilter((RenderRequest)req, (RenderResponse)res);
		}
	}
	
	public void addFilter(Filter filter){
		filterList.add(filter);
	}
	
	public void doFilter(ActionRequest request, ActionResponse response) throws IOException, PortletException {
		if (filterListIndex <filterList.size()){
			Filter filter = filterList.get(filterListIndex);
			filterListIndex++;
			try {
				ActionFilter actionFilter = (ActionFilter) loader.loadClass(filter.getFilterClass()).newInstance();
				FilterConfigImpl filterConfig = new FilterConfigImpl(filter.getFilterName(),filter.getInitParams(),portletContext);
				actionFilter.init(filterConfig);
				actionFilter.doFilter(request, response, this);
				actionFilter.destroy();
			} catch (InstantiationException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
		else{
			portlet.processAction(request, response);
		}
	}
	
	public void doFilter(EventRequest request, EventResponse response) throws IOException, PortletException {
		if (filterListIndex <filterList.size()){
			Filter filter = filterList.get(filterListIndex);
			filterListIndex++;
			try {
				EventFilter eventFilter = (EventFilter) loader.loadClass(filter.getFilterClass()).newInstance();
				FilterConfigImpl filterConfig = new FilterConfigImpl(filter.getFilterName(),filter.getInitParams(),portletContext);
				eventFilter.init(filterConfig);
				eventFilter.doFilter(request, response, this);
				eventFilter.destroy();
			} catch (InstantiationException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
		else{
			eventPortlet.processEvent(request, response);
		}
	}

	public void doFilter(RenderRequest request, RenderResponse response) throws IOException, PortletException {
		if (filterListIndex <filterList.size()){
			Filter filter = filterList.get(filterListIndex);
			filterListIndex++;
			try {
				RenderFilter renderFilter = (RenderFilter) loader.loadClass(filter.getFilterClass()).newInstance();
				FilterConfigImpl filterConfig = new FilterConfigImpl(filter.getFilterName(),filter.getInitParams(),portletContext);
				renderFilter.init(filterConfig);
				renderFilter.doFilter(request, response, this);
				renderFilter.destroy();
			} catch (InstantiationException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
		else{
			portlet.render(request, response);
		}
	}

	public void doFilter(ResourceRequest request, ResourceResponse response) throws IOException, PortletException {
		if (filterListIndex <filterList.size()){
			Filter filter = filterList.get(filterListIndex);
			filterListIndex++;
			try {
				ResourceFilter resourceFilter = (ResourceFilter) loader.loadClass(filter.getFilterClass()).newInstance();
				FilterConfigImpl filterConfig = new FilterConfigImpl(filter.getFilterName(),filter.getInitParams(),portletContext);
				resourceFilter.init(filterConfig);
				resourceFilter.doFilter(request, response, this);
				resourceFilter.destroy();
			} catch (InstantiationException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
		else{
			resourceServingPortlet.serveResource(request, response);
		}
	}
}