001    /*
002     * Copyright (C) 2003-2009 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.term;
020    
021    import org.crsh.plugin.PluginContext;
022    import org.crsh.term.spi.TermIOHandler;
023    
024    import java.util.Iterator;
025    
026    /**
027     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
028     * @version $Revision$
029     */
030    public abstract class TermLifeCycle {
031    
032      /** . */
033      private final PluginContext context;
034    
035      protected TermLifeCycle(PluginContext context) {
036        if (context == null) {
037          throw new NullPointerException();
038        }
039    
040        //
041        this.context = context;
042      }
043    
044      public final void init() {
045        try {
046          doInit();
047        } catch (Exception e) {
048          e.printStackTrace();
049        }
050      }
051    
052      public final void destroy() {
053        doDestroy();
054      }
055    
056      public final TermIOHandler getHandler() {
057        Iterator<TermIOHandler> handlers = context.getPlugins(TermIOHandler.class).iterator();
058        if (handlers.hasNext()) {
059          return handlers.next();
060        } else {
061          return null;
062        }
063      }
064    
065      public final PluginContext getContext() {
066        return context;
067      }
068    
069      protected abstract void doInit() throws Exception;
070    
071      protected abstract void doDestroy();
072    
073    }