001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.plugin;
020    
021    import java.util.Collections;
022    import java.util.LinkedHashSet;
023    
024    public class SimplePluginDiscovery implements PluginDiscovery {
025    
026      /** . */
027      private final LinkedHashSet<CRaSHPlugin<?>> plugins;
028    
029      public SimplePluginDiscovery() {
030        this.plugins = new LinkedHashSet<CRaSHPlugin<?>>();
031      }
032    
033      public SimplePluginDiscovery(CRaSHPlugin<?>... plugins) {
034        this();
035        for (CRaSHPlugin<?> plugin : plugins) {
036          add(plugin);
037        }
038      }
039      /**
040       * Add a plugin.
041       *
042       * @param plugin the plugin
043       * @return this object
044       * @throws NullPointerException if the plugin is null
045       */
046      public SimplePluginDiscovery add(CRaSHPlugin<?> plugin) throws NullPointerException {
047        if (plugin == null) {
048          throw new NullPointerException();
049        }
050        plugins.add(plugin);
051        return this;
052      }
053    
054      public Iterable<CRaSHPlugin<?>> getPlugins() {
055        return Collections.unmodifiableSet(plugins);
056      }
057    }