01: /*
02: * The contents of this file are subject to the
03: * Mozilla Public License Version 1.1 (the "License");
04: * you may not use this file except in compliance with the License.
05: * You may obtain a copy of the License at http://www.mozilla.org/MPL/
06: *
07: * Software distributed under the License is distributed on an "AS IS"
08: * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
09: * 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 execute(Context context) throws CommandException {
45: if ((m_commandObj instanceof Editable) == false) {
46: throw new InvalidCommandException(
47: "Command is not valid for this object:"
48: + m_commandObj.getClass());
49: }
50:
51: if (isAvailable(context) == false) {
52: throw new InvalidCommandException(
53: "Command is not available for this object");
54: }
55:
56: Editable editable = (Editable) getCommandObject(context);
57: Object cmdResult = null;
58:
59: try {
60: cmdResult = editable.getHistoricalVersions();
61: } catch (DataAccessException e) {
62: throw new CommandExecutionException(
63: "Error getting historical versions", e);
64: }
65:
66: return cmdResult;
67: }
68:
69: /* (non-Javadoc)
70: * @see org.openharmonise.rm.commands.AbstractCmd#getName()
71: */
72: public String getName() {
73: return "GetHistoricalVersions";
74: }
75:
76: /* (non-Javadoc)
77: * @see org.openharmonise.rm.commands.AbstractCmd#isValidCommandObject(java.lang.Object)
78: */
79: public boolean isValidCommandObject(Object obj) {
80: return (obj instanceof Editable);
81: }
82: }
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