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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 1.4 2007/11/02 17:50:36 taqua 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: import javax.swing.Action; 47: 48: /** 49: * This class is used to collect actions to be enabled or disabled 50: * by a sinle call. 51: * 52: * @author Thomas Morgner 53: */ 54: public class ActionConcentrator { 55: 56: /** The collection used to store the actions of this concentrator. */ 57: private final ArrayList actions; 58: 59: /** 60: * DefaultConstructor. 61: */ 62: public ActionConcentrator() { 63: this.actions = new ArrayList(); 64: } 65: 66: /** 67: * Adds the action to this concentrator. 68: * 69: * @param a the action to be added. 70: */ 71: public void addAction(final Action a) { 72: if (a == null) { 73: throw new NullPointerException(); 74: } 75: this.actions.add(a); 76: } 77: 78: /** 79: * Removes the action from this concentrator. 80: * 81: * @param a the action to be removed. 82: */ 83: public void removeAction(final Action a) { 84: if (a == null) { 85: throw new NullPointerException(); 86: } 87: this.actions.remove(a); 88: } 89: 90: /** 91: * Defines the state for all actions. 92: * 93: * @param b the new state for all actions. 94: */ 95: public void setEnabled(final boolean b) { 96: for (int i = 0; i < this.actions.size(); i++) { 97: final Action a = (Action) this.actions.get(i); 98: a.setEnabled(b); 99: } 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: }