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Java > Open Source Codes > org > riotfamily > riot > list > command > core > SwapCommand


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1
3  * The contents of this file are subject to the Mozilla Public License Version
4  * 1.1 (the "License"); you may not use this file except in compliance with
5  * the License. You may obtain a copy of the License at
6  * http://www.mozilla.org/MPL/
7  *
8  * Software distributed under the License is distributed on an "AS IS" basis,
9  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10  * for the specific language governing rights and limitations under the
11  * License.
12  *
13  * The Original Code is Riot.
14  *
15  * The Initial Developer of the Original Code is
16  * Neteye GmbH.
17  * Portions created by the Initial Developer are Copyright (C) 2006
18  * the Initial Developer. All Rights Reserved.
19  *
20  * Contributor(s):
21  * Felix Gnass [fgnass at neteye dot de]
22  *
23  * ***** END LICENSE BLOCK ***** */
24 package org.riotfamily.riot.list.command.core;
25
26 import org.riotfamily.riot.dao.SwappableItemDao;
27 import org.riotfamily.riot.editor.EditorDefinitionUtils;
28 import org.riotfamily.riot.editor.ListDefinition;
29 import org.riotfamily.riot.list.command.CommandContext;
30 import org.riotfamily.riot.list.command.CommandResult;
31 import org.riotfamily.riot.list.command.result.ReloadResult;
32
33 /**
34  * Command that swaps two items in a list.
35  */
36 public class SwapCommand extends AbstractCommand {
37
38     public static final String JavaDoc ACTION_MOVE_UP = "moveUp";
39     public static final String JavaDoc ACTION_MOVE_DOWN = "moveDown";
40
41     private int swapWith;
42
43     public void setSwapWith(int swapWith) {
44         this.swapWith = swapWith;
45     }
46
47     protected String JavaDoc getAction(CommandContext context) {
48         return swapWith > 0 ? ACTION_MOVE_DOWN : ACTION_MOVE_UP;
49     }
50
51     protected boolean isEnabled(CommandContext context, String JavaDoc action) {
52         if (context.getDao() instanceof SwappableItemDao) {
53             int index = context.getParams().getOffset() + context.getRowIndex();
54             return index + swapWith >= 0 &&
55                     index + swapWith < context.getItemsTotal();
56         }
57         return false;
58     }
59
60     public CommandResult execute(CommandContext context) {
61         SwappableItemDao dao = (SwappableItemDao) context.getDao();
62         ListDefinition listDef = context.getListDefinition();
63         String JavaDoc parentId = context.getParentId();
64         Object JavaDoc parent = EditorDefinitionUtils.loadParent(listDef, parentId);
65
66         dao.swapEntity(context.getBean(), parent, context.getParams(),
67                 context.getRowIndex() + swapWith);
68
69         return new ReloadResult();
70     }
71
72 }
73
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