001 /* ========================================================================
002 * JCommon : a free general purpose class library for the Java(tm) platform
003 * ========================================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jcommon/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * -----------------------
028 * ActionConcentrator.java
029 * -----------------------
030 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
031 *
032 * Original Author: Thomas Morgner;
033 * Contributor(s): David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: ActionConcentrator.java,v 1.4 2007/11/02 17:50:36 taqua Exp $
036 *
037 * Changes
038 * -------
039 * 24-Aug-2003 : Initial version
040 * 07-Jun-2004 : Corrected source headers (DG);
041 */
042
043 package org.jfree.ui.action;
044
045 import java.util.ArrayList;
046 import javax.swing.Action;
047
048 /**
049 * This class is used to collect actions to be enabled or disabled
050 * by a sinle call.
051 *
052 * @author Thomas Morgner
053 */
054 public class ActionConcentrator {
055
056 /** The collection used to store the actions of this concentrator. */
057 private final ArrayList actions;
058
059 /**
060 * DefaultConstructor.
061 */
062 public ActionConcentrator() {
063 this.actions = new ArrayList();
064 }
065
066 /**
067 * Adds the action to this concentrator.
068 *
069 * @param a the action to be added.
070 */
071 public void addAction(final Action a) {
072 if (a == null) {
073 throw new NullPointerException();
074 }
075 this.actions.add(a);
076 }
077
078 /**
079 * Removes the action from this concentrator.
080 *
081 * @param a the action to be removed.
082 */
083 public void removeAction(final Action a) {
084 if (a == null) {
085 throw new NullPointerException();
086 }
087 this.actions.remove(a);
088 }
089
090 /**
091 * Defines the state for all actions.
092 *
093 * @param b the new state for all actions.
094 */
095 public void setEnabled(final boolean b) {
096 for (int i = 0; i < this.actions.size(); i++) {
097 final Action a = (Action) this.actions.get(i);
098 a.setEnabled(b);
099 }
100 }
101
102 /**
103 * Returns, whether all actions are disabled.
104 * If one action is enabled, then this method will return
105 * true.
106 *
107 * @return true, if at least one action is enabled, false
108 * otherwise.
109 */
110 public boolean isEnabled() {
111 for (int i = 0; i < this.actions.size(); i++) {
112 final Action a = (Action) this.actions.get(i);
113 if (a.isEnabled()) {
114 return true;
115 }
116 }
117 return false;
118 }
119
120 }