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1: /* AbstractSpinnerModel.java -- 2: Copyright (C) 2004 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package javax.swing; 40: 41: import java.util.EventListener; 42: 43: import javax.swing.event.ChangeEvent; 44: import javax.swing.event.ChangeListener; 45: import javax.swing.event.EventListenerList; 46: 47: /** 48: * Provides standard implementations for some of the methods in 49: * {@link SpinnerModel}. 50: * 51: * @author Ka-Hing Cheung 52: */ 53: public abstract class AbstractSpinnerModel implements SpinnerModel 54: { 55: private ChangeEvent changeEvent = new ChangeEvent(this); 56: 57: protected EventListenerList listenerList = new EventListenerList(); 58: 59: /** 60: * Creates an <code>AbstractSpinnerModel</code>. 61: */ 62: public AbstractSpinnerModel() 63: { 64: // Nothing to do here. 65: } 66: 67: /** 68: * Adds a <code>ChangeListener</code>. 69: * 70: * @param listener the listener to add 71: */ 72: public void addChangeListener(ChangeListener listener) 73: { 74: listenerList.add(ChangeListener.class, listener); 75: } 76: 77: /** 78: * Gets all the listeners that are of a particular type. 79: * 80: * @param c the type of listener 81: * @return the listeners that are of the specific type 82: */ 83: public EventListener[] getListeners(Class c) 84: { 85: return listenerList.getListeners(c); 86: } 87: 88: /** 89: * Gets all the <code>ChangeListener</code>s. 90: * 91: * @return all the <code>ChangeListener</code>s 92: */ 93: public ChangeListener[] getChangeListeners() 94: { 95: return (ChangeListener[]) listenerList.getListeners(ChangeListener.class); 96: } 97: 98: /** 99: * Remove a particular listener. 100: * 101: * @param listener the listener to remove 102: */ 103: public void removeChangeListener(ChangeListener listener) 104: { 105: listenerList.remove(ChangeListener.class, listener); 106: } 107: 108: /** 109: * Fires a <code>ChangeEvent</code> to all the <code>ChangeListener</code>s 110: * added to this model 111: */ 112: protected void fireStateChanged() 113: { 114: ChangeListener[] listeners = getChangeListeners(); 115: 116: for(int i = 0; i < listeners.length; ++i) 117: listeners[i].stateChanged(changeEvent); 118: } 119: }
GNU Classpath (0.20) |