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Java > Open Source Codes > org > openharmonise > rm > commands > CmdGetHistoricalVersions


1 /*
2  * The contents of this file are subject to the
3  * Mozilla Public License Version 1.1 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at http://www.mozilla.org/MPL/
6  *
7  * Software distributed under the License is distributed on an "AS IS"
8  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
9  * See the License for the specific language governing rights and
10  * limitations under the License.
11  *
12  * The Initial Developer of the Original Code is Simulacra Media Ltd.
13  * Portions created by Simulacra Media Ltd are Copyright (C) Simulacra Media Ltd, 2004.
14  *
15  * All Rights Reserved.
16  *
17  * Contributor(s):
18  */
19 package org.openharmonise.rm.commands;
20
21 import org.openharmonise.rm.DataAccessException;
22 import org.openharmonise.rm.resources.lifecycle.Editable;
23
24 /**
25  * Gets the historical versoins of the 'command object', if it
26  * is an instance of <code>Editable</code>
27  *
28  * @author Michael Bell
29  * @version $Revision: 1.3 $
30  *
31  */
32 public class CmdGetHistoricalVersions extends AbstractCmd {
33     
34     /**
35      * Creates an instance of the command
36      */
37     public CmdGetHistoricalVersions() {
38         super();
39     }
40
41     /* (non-Javadoc)
42      * @see org.openharmonise.rm.commands.AbstractCmd#execute()
43      */
44     public Object JavaDoc execute(Context context) throws CommandException {
45         if((m_commandObj instanceof Editable) == false) {
46             throw new InvalidCommandException("Command is not valid for this object:" + m_commandObj.getClass());
47         }
48
49         if (isAvailable(context) == false) {
50           throw new InvalidCommandException("Command is not available for this object");
51         }
52             
53         Editable editable = (Editable) getCommandObject(context);
54         Object JavaDoc cmdResult = null;
55         
56         try {
57             cmdResult = editable.getHistoricalVersions();
58         } catch (DataAccessException e) {
59             throw new CommandExecutionException("Error getting historical versions",e);
60         }
61         
62         
63         
64         return cmdResult;
65     }
66
67     /* (non-Javadoc)
68      * @see org.openharmonise.rm.commands.AbstractCmd#getName()
69      */
70     public String JavaDoc getName() {
71         return "GetHistoricalVersions";
72     }
73     
74     /* (non-Javadoc)
75      * @see org.openharmonise.rm.commands.AbstractCmd#isValidCommandObject(java.lang.Object)
76      */
77     public boolean isValidCommandObject(Object JavaDoc obj) {
78         return (obj instanceof Editable);
79     }
80 }
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