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Java > Open Source Codes > org > objectweb > util > browser > plugin > java > map > MapClearAction


1 /*====================================================================
2
3 Objectweb Browser Framework
4 Copyright (C) 2000-2003 INRIA - USTL - LIFL - GOAL
5 Contact: openccm@objectweb.org
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with this library; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 USA
21
22 Initial developer(s): Philippe Merle, Jerome Moroy.
23 Contributor(s): ______________________________________.
24
25 ====================================================================*/
26
27 package org.objectweb.util.browser.plugin.java.map;
28
29 import org.objectweb.util.browser.api.MenuItem;
30 import org.objectweb.util.browser.api.MenuItemTreeView;
31 import org.objectweb.util.browser.api.TreeView;
32
33 /**
34  * This action clears all the elements of a <code>java.util.Map</code> object.
35  * A <code>UnsupportedOperationException</code> may be thrown if the implementation
36  * of the map doesn't supported the requested operation.
37  *
38  * @author <a HREF="mailto:Philippe.Merle@lifl.fr">Philippe Merle</a>,
39  * <a HREF="mailto:Jerome.Moroy@lifl.fr">Jérôme Moroy</a>
40  *
41  * @version 0.1
42  */
43 public class MapClearAction
44   implements MenuItem
45 {
46
47     //==================================================================
48 //
49 // No internal state.
50 //
51 //==================================================================
52
53     //==================================================================
54 //
55 // No constructor.
56 //
57 //==================================================================
58
59     //==================================================================
60 //
61 // No internal method.
62 //
63 //==================================================================
64
65     //==================================================================
66 //
67 // Public methods for MenuItem.
68 //
69 //==================================================================
70
71     /**
72      * This item is enabled only if the map contains at least one entry.
73      */
74     public int getStatus(TreeView treeView)
75     {
76         // Obtains the selected map.
77 java.util.Map JavaDoc map = (java.util.Map JavaDoc)treeView.getSelectedObject();
78
79         // Item enabled if this map contains at least one entry.
80 if (map.size()>0)
81             return MenuItem.ENABLED_STATUS;
82         return MenuItem.DISABLED_STATUS;
83     }
84
85     /**
86      * Removes all the mappings from this map.
87      */
88     public void actionPerformed(MenuItemTreeView treeView)
89     throws Exception JavaDoc
90     {
91         // Obtains the selected map.
92 java.util.Map JavaDoc map = (java.util.Map JavaDoc)treeView.getSelectedObject();
93         
94         // Removes all entries from this map.
95 map.clear();
96     }
97
98 }
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