/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited * * Licensed 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.acegisecurity.securechannel;import org.acegisecurity.ConfigAttribute;import org.acegisecurity.ConfigAttributeDefinition;import org.acegisecurity.intercept.web.FilterInvocation;import org.springframework.beans.factory.InitializingBean;import java.io.IOException;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;/** * Implementation of {@link ChannelDecisionManager}.<p>Iterates through each configured {@link ChannelProcessor}. * If a <code>ChannelProcessor</code> has any issue with the security of the request, it should cause a redirect, * exception or whatever other action is appropriate for the <code>ChannelProcessor</code> implementation.</p> *  <P>Once any response is committed (ie a redirect is written to the response object), the * <code>ChannelDecisionManagerImpl</code> will not iterate through any further <code>ChannelProcessor</code>s.</p> * * @author Ben Alex * @version $Id: ChannelDecisionManagerImpl.java 1496 2006-05-23 13:38:33Z benalex $ */public class ChannelDecisionManagerImpl implements ChannelDecisionManager, InitializingBean {    //~ Instance fields ================================================================================================    private List channelProcessors;    //~ Methods ========================================================================================================    public void afterPropertiesSet() throws Exception {        checkIfValidList(this.channelProcessors);    }    private void checkIfValidList(List listToCheck) {        if ((listToCheck == null) || (listToCheck.size() == 0)) {            throw new IllegalArgumentException("A list of ChannelProcessors is required");        }    }    public void decide(FilterInvocation invocation, ConfigAttributeDefinition config)        throws IOException, ServletException {        Iterator iter = this.channelProcessors.iterator();        while (iter.hasNext()) {            ChannelProcessor processor = (ChannelProcessor) iter.next();            processor.decide(invocation, config);            if (invocation.getResponse().isCommitted()) {                break;            }        }    }    public List getChannelProcessors() {        return this.channelProcessors;    }    public void setChannelProcessors(List newList) {        checkIfValidList(newList);        Iterator iter = newList.iterator();        while (iter.hasNext()) {            Object currentObject = null;            try {                currentObject = iter.next();                ChannelProcessor attemptToCast = (ChannelProcessor) currentObject;            } catch (ClassCastException cce) {                throw new IllegalArgumentException("ChannelProcessor " + currentObject.getClass().getName()                    + " must implement ChannelProcessor");            }        }        this.channelProcessors = newList;    }    public boolean supports(ConfigAttribute attribute) {        Iterator iter = this.channelProcessors.iterator();        while (iter.hasNext()) {            ChannelProcessor processor = (ChannelProcessor) iter.next();            if (processor.supports(attribute)) {                return true;            }        }        return false;    }}