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.Redirector;
024import org.apache.cocoon.environment.SourceResolver;
025
026/**
027 * Tests if a given plugin exists. 
028 */
029public class PluginExistsAction extends AbstractAction implements ThreadSafe
030{
031    @Override
032    public Map act(Redirector redirector, SourceResolver resolver, Map objectModel, String source, Parameters parameters) throws Exception
033    {
034        if (PluginsManager.getInstance().getPluginNames().contains(source))
035        {
036            return EMPTY_MAP;
037        }
038        
039        return null;
040    }
041}