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Java > Open Source Codes > org > jfree > ui > action > ActionConcentrator


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * -----------------------
28  * ActionConcentrator.java
29  * -----------------------
30  * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: ActionConcentrator.java,v 1.3 2005/10/18 13:22:13 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 24-Aug-2003 : Initial version
40  * 07-Jun-2004 : Corrected source headers (DG);
41  */
42
43 package org.jfree.ui.action;
44
45 import java.util.ArrayList JavaDoc;
46
47 import javax.swing.Action JavaDoc;
48
49 /**
50  * This class is used to collect actions to be enabled or disabled
51  * by a sinle call.
52  *
53  * @author Thomas Morgner
54  */
55 public class ActionConcentrator {
56
57     /** The collection used to store the actions of this concentrator. */
58     private final ArrayList JavaDoc actions;
59
60     /**
61      * DefaultConstructor.
62      */
63     public ActionConcentrator() {
64         this.actions = new ArrayList JavaDoc();
65     }
66
67     /**
68      * Adds the action to this concentrator.
69      *
70      * @param a the action to be added.
71      */
72     public void addAction(final Action JavaDoc a) {
73         if (a == null) {
74             throw new NullPointerException JavaDoc();
75         }
76         this.actions.add(a);
77     }
78
79     /**
80      * Removes the action from this concentrator.
81      *
82      * @param a the action to be removed.
83      */
84     public void removeAction(final Action JavaDoc a) {
85         if (a == null) {
86             throw new NullPointerException JavaDoc();
87         }
88         this.actions.remove(a);
89     }
90
91     /**
92      * Defines the state for all actions.
93      *
94      * @param b the new state for all actions.
95      */
96     public void setEnabled(final boolean b) {
97         for (int i = 0; i < this.actions.size(); i++) {
98             final Action JavaDoc a = (Action JavaDoc) this.actions.get(i);
99             a.setEnabled(b);
100         }
101     }
102
103     /**
104      * Returns, whether all actions are disabled.
105      * If one action is enabled, then this method will return
106      * true.
107      *
108      * @return true, if at least one action is enabled, false
109      * otherwise.
110      */
111     public boolean isEnabled() {
112         for (int i = 0; i < this.actions.size(); i++) {
113             final Action JavaDoc a = (Action JavaDoc) this.actions.get(i);
114             if (a.isEnabled()) {
115                 return true;
116             }
117         }
118         return false;
119     }
120     
121 }
122
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