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.term;
020
021 import org.crsh.plugin.PluginContext;
022 import org.crsh.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 }