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/* * @(#)AbstractSpinnerModel.java 1.9 06/03/29 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package javax.swing; import java.util.*; import javax.swing.event.*; /** * This class provides the ChangeListener part of the * SpinnerModel interface that should be suitable for most concrete SpinnerModel * implementations. Subclasses must provide an implementation of the * <code>setValue</code>, <code>getValue</code>, <code>getNextValue</code> and * <code>getPreviousValue</code> methods. * * @see JSpinner * @see SpinnerModel * @see SpinnerListModel * @see SpinnerNumberModel * @see SpinnerDateModel * * @version 1.9 03/29/06 * @author Hans Muller * @since 1.4 */ public abstract class AbstractSpinnerModel implements SpinnerModel { /** * Only one ChangeEvent is needed per model instance since the * event's only (read-only) state is the source property. The source * of events generated here is always "this". */ private transient ChangeEvent changeEvent = null; /** * The list of ChangeListeners for this model. Subclasses may * store their own listeners here. */ protected EventListenerList listenerList = new EventListenerList(); /** * Adds a ChangeListener to the model's listener list. The * ChangeListeners must be notified when the models value changes. * * @param l the ChangeListener to add * @see #removeChangeListener * @see SpinnerModel#addChangeListener */ public void addChangeListener(ChangeListener l) { listenerList.add(ChangeListener.class, l); } /** * Removes a ChangeListener from the model's listener list. * * @param l the ChangeListener to remove * @see #addChangeListener * @see SpinnerModel#removeChangeListener */ public void removeChangeListener(ChangeListener l) { listenerList.remove(ChangeListener.class, l); } /** * Returns an array of all the <code>ChangeListener</code>s added * to this AbstractSpinnerModel with addChangeListener(). * * @return all of the <code>ChangeListener</code>s added or an empty * array if no listeners have been added * @since 1.4 */ public ChangeListener[] getChangeListeners() { return (ChangeListener[])listenerList.getListeners( ChangeListener.class); } /** * Run each ChangeListeners stateChanged() method. * * @see #setValue * @see EventListenerList */ protected void fireStateChanged() { Object[] listeners = listenerList.getListenerList(); for (int i = listeners.length - 2; i >= 0; i -=2 ) { if (listeners[i] == ChangeListener.class) { if (changeEvent == null) { changeEvent = new ChangeEvent(this); } ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); } } } /** * Return an array of all the listeners of the given type that * were added to this model. For example to find all of the * ChangeListeners added to this model: * <pre> * myAbstractSpinnerModel.getListeners(ChangeListener.class); * </pre> * * @param listenerType the type of listeners to return, e.g. ChangeListener.class * @return all of the objects receiving <em>listenerType</em> notifications * from this model */ public <T extends EventListener> T[] getListeners(Class<T> listenerType) { return listenerList.getListeners(listenerType); } }