001/*
002 *  Copyright 2012 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.runtime.plugin;
017
018import java.util.Map;
019
020import org.apache.avalon.framework.parameters.Parameters;
021import org.apache.avalon.framework.thread.ThreadSafe;
022import org.apache.cocoon.acting.AbstractAction;
023import org.apache.cocoon.environment.ObjectModelHelper;
024import org.apache.cocoon.environment.Redirector;
025import org.apache.cocoon.environment.SourceResolver;
026
027/**
028 * Tests if a given plugin exists. 
029 */
030public class PluginExistsAction extends AbstractAction implements ThreadSafe
031{
032    /** Request attribute name holding current plugin  */
033    public static final String PLUGIN_ATTR = "pluginName";
034    
035    @Override
036    public Map act(Redirector redirector, SourceResolver resolver, Map objectModel, String source, Parameters parameters) throws Exception
037    {
038        if (PluginsManager.getInstance().getPluginNames().contains(source))
039        {
040            ObjectModelHelper.getRequest(objectModel).setAttribute(PLUGIN_ATTR, source);                
041            return EMPTY_MAP;
042        }
043        
044        return null;
045    }
046}