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 }