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 */
019package org.crsh.plugin;
020
021import java.util.Collections;
022import java.util.LinkedHashSet;
023
024public 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}