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1   /*
2   * E-nspire Gemini.
3   * A Java and AspectJ based framework that enables transparent 
4   * bidirectional relationships between Plain Old Java Objects.
5   * 
6   * Copyright (C) 2005 Dragan Djuric
7   * 
8   * This program is free software; you can redistribute it and/or
9   * modify it under the terms of the GNU General Public License
10  * as published by the Free Software Foundation; either version 2
11  * of the License, or (at your option) any later version.
12  * 
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  * 
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21  * 
22  * Contact the author at dragand@dev.java.net
23  */
24  package com.enspire.gemini.commands;
25  
26  import java.util.LinkedList;
27  import java.util.List;
28  
29  /***
30   * The basic implementation of <code>CommandExecutor</code>. Keeps executed 
31   * commands in a <code>List</code>.
32   * @author Dragan Djuric <dragand@dev.java.net>
33   * @since 1.0
34   */
35  public class CommandExecutorImpl implements CommandExecutor {
36  
37      private List executed = new LinkedList();
38      
39      /***
40       * @see com.enspire.gemini.commands.CommandExecutor#execute(com.enspire.gemini.commands.Command)
41       */
42      public void execute(Command command) {
43          command.execute();
44          executed.add(command);
45      }
46  
47      /***
48       * @see com.enspire.gemini.commands.CommandExecutor#undo()
49       */
50      public void undo() {
51          for (int i = executed.size() - 1; i > -1; i--) {
52              Command command = (Command)executed.get(i);
53              command.undo();
54              executed.remove(i);
55          }
56      }
57  
58  }