Java tutorial
/* * Copyright 2002 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistribution in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * This software is provided "AS IS," without a warranty of any * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or * intended for use in the design, construction, operation or * maintenance of any nuclear facility. */ import javax.swing.event.EventListenerList; import javax.swing.event.TreeModelListener; import javax.swing.event.TreeModelEvent; import javax.swing.tree.TreeModel; /** * A Class that implements the listener registration and event fire methods for * a TreeModel. This class gets the implementation from DefaultTreeModel * * @version %I% %G% * @author Mark Davidson */ public abstract class TreeModelSupport implements TreeModel { protected EventListenerList listenerList = new EventListenerList(); /** * Adds a listener for the TreeModelEvent posted after the tree changes. * * @see #removeTreeModelListener * @param l the listener to add */ public void addTreeModelListener(TreeModelListener l) { listenerList.add(TreeModelListener.class, l); } /** * Removes a listener previously added with <B>addTreeModelListener()</B>. * * @see #addTreeModelListener * @param l the listener to remove */ public void removeTreeModelListener(TreeModelListener l) { listenerList.remove(TreeModelListener.class, l); } /* * Notify all listeners that have registered interest for * notification on this event type. The event instance * is lazily created using the parameters passed into * the fire method. * @see EventListenerList */ protected void fireTreeNodesChanged(Object source, Object[] path, int[] childIndices, Object[] children) { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); TreeModelEvent e = null; // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length - 2; i >= 0; i -= 2) { if (listeners[i] == TreeModelListener.class) { // Lazily create the event: if (e == null) e = new TreeModelEvent(source, path, childIndices, children); ((TreeModelListener) listeners[i + 1]).treeNodesChanged(e); } } } /* * Notify all listeners that have registered interest for * notification on this event type. The event instance * is lazily created using the parameters passed into * the fire method. * @see EventListenerList */ protected void fireTreeNodesInserted(Object source, Object[] path, int[] childIndices, Object[] children) { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); TreeModelEvent e = null; // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length - 2; i >= 0; i -= 2) { if (listeners[i] == TreeModelListener.class) { // Lazily create the event: if (e == null) e = new TreeModelEvent(source, path, childIndices, children); ((TreeModelListener) listeners[i + 1]).treeNodesInserted(e); } } } /* * Notify all listeners that have registered interest for * notification on this event type. The event instance * is lazily created using the parameters passed into * the fire method. * @see EventListenerList */ protected void fireTreeNodesRemoved(Object source, Object[] path, int[] childIndices, Object[] children) { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); TreeModelEvent e = null; // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length - 2; i >= 0; i -= 2) { if (listeners[i] == TreeModelListener.class) { // Lazily create the event: if (e == null) e = new TreeModelEvent(source, path, childIndices, children); ((TreeModelListener) listeners[i + 1]).treeNodesRemoved(e); } } } protected void fireTreeNodesRemoved(TreeModelEvent evt) { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length - 2; i >= 0; i -= 2) { if (listeners[i] == TreeModelListener.class) { ((TreeModelListener) listeners[i + 1]).treeStructureChanged(evt); } } } /* * Notify all listeners that have registered interest for * notification on this event type. The event instance * is lazily created using the parameters passed into * the fire method. * @see EventListenerList */ protected void fireTreeStructureChanged(Object source, Object[] path, int[] childIndices, Object[] children) { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); TreeModelEvent e = null; // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length - 2; i >= 0; i -= 2) { if (listeners[i] == TreeModelListener.class) { // Lazily create the event: if (e == null) e = new TreeModelEvent(source, path, childIndices, children); ((TreeModelListener) listeners[i + 1]).treeStructureChanged(e); } } } }