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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; 46: 47: import javax.swing.Action; 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 actions; 59: 60: /** 61: * DefaultConstructor. 62: */ 63: public ActionConcentrator() { 64: this.actions = new ArrayList(); 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 a) { 73: if (a == null) { 74: throw new NullPointerException(); 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 a) { 85: if (a == null) { 86: throw new NullPointerException(); 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 a = (Action) 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 a = (Action) this.actions.get(i); 114: if (a.isEnabled()) { 115: return true; 116: } 117: } 118: return false; 119: } 120: 121: }