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.telnet.term;
020    
021    import org.crsh.plugin.PluginContext;
022    import org.crsh.telnet.term.spi.TermIOHandler;
023    
024    import java.util.Iterator;
025    
026    public abstract class TermLifeCycle {
027    
028      /** . */
029      private final PluginContext context;
030    
031      protected TermLifeCycle(PluginContext context) {
032        if (context == null) {
033          throw new NullPointerException();
034        }
035    
036        //
037        this.context = context;
038      }
039    
040      public final void init() {
041        try {
042          doInit();
043        } catch (Exception e) {
044          e.printStackTrace();
045        }
046      }
047    
048      public final void destroy() {
049        doDestroy();
050      }
051    
052      public final TermIOHandler getHandler() {
053        Iterator<TermIOHandler> handlers = context.getPlugins(TermIOHandler.class).iterator();
054        if (handlers.hasNext()) {
055          return handlers.next();
056        } else {
057          return null;
058        }
059      }
060    
061      public final PluginContext getContext() {
062        return context;
063      }
064    
065      protected abstract void doInit() throws Exception;
066    
067      protected abstract void doDestroy();
068    
069    }