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 */
016
017package org.ametys.runtime.plugin;
018
019import java.util.HashMap;
020import java.util.Map;
021import java.util.Set;
022
023import org.apache.avalon.framework.activity.Initializable;
024import org.apache.avalon.framework.component.Component;
025
026import org.ametys.runtime.plugin.component.AbstractLogEnabled;
027
028/**
029 * Abstract implementation of an extension point.<br>
030 * Contains only helper methods. Tha actual job has to be done in the {@link #addExtension(String, String, String, org.apache.avalon.framework.configuration.Configuration)}
031 * @param <T> the type of the managed extensions
032 */
033public abstract class AbstractExtensionPoint<T> extends AbstractLogEnabled implements ExtensionPoint<T>, Initializable, Component
034{
035    /**
036     * Map containing the extensions.<br>
037     * The key is the unique id of the extension.
038     */
039    protected Map<String, T> _extensions;
040    
041    public void initialize() throws Exception
042    {
043        _extensions = new HashMap<>();
044    }
045    
046    public T getExtension(String id)
047    {
048        return _extensions.get(id);
049    }
050
051    public Set<String> getExtensionsIds()
052    {
053        return _extensions.keySet();
054    }
055
056    public boolean hasExtension(String id)
057    {
058        return _extensions.containsKey(id);
059    }
060}