1 /**
2 * This file Copyright (c) 2003-2011 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.module;
35
36 import info.magnolia.module.delta.Delta;
37 import info.magnolia.module.model.Version;
38
39 import java.util.List;
40
41 /**
42 * This class provides Delta's to be applied to install/update/uninstall modules.
43 * A module that needs to handle its own install/updates should provide an implementation
44 * of this interface.
45 *
46 * @see AbstractModuleVersionHandler for a convenient super class.
47 *
48 * @author gjoseph
49 * @version $Revision: $ ($Author: $)
50 */
51 public interface ModuleVersionHandler {
52
53
54 // TODO : these two methods can maybe be merged, since they're called sequentially in ModuleManager
55 /**
56 * Gets the currently installed version number of this module.
57 */
58 Version getCurrentlyInstalled(InstallContext ctx);
59
60 /**
61 * Returns the deltas to be applied to update from the given Version from
62 * to the current one. If from is null, it means the module is being installed,
63 * and we should thus return the necessary deltas to <strong>install</strong>
64 * it.
65 * It is also responsible for updating the current version number of the module,
66 * wherever it is stored.
67 */
68 List<Delta> getDeltas(InstallContext installContext, Version from);
69
70 /**
71 * Returns a {@link Delta} that needs to be executed always before this module is started. These tasks will
72 * be silently applied at startup.
73 * @param installContext InstallContext
74 * @deprecated It seems irrelevant to have startup tasks in a VersionHandler. These should probably be moved to ModuleLifecycle.
75 */
76 Delta getStartupDelta(InstallContext installContext);
77
78 }