| /******************************************************************************* |
| * Copyright (c) 2008 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v1.0, which accompanies this distribution |
| * and is available at http://www.eclipse.org/legal/epl-v10.html. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.utility.internal.model.value; |
| |
| import java.util.Arrays; |
| |
| import org.eclipse.jpt.utility.internal.model.Model; |
| import org.eclipse.jpt.utility.internal.model.event.TreeChangeEvent; |
| import org.eclipse.jpt.utility.internal.model.listener.TreeChangeListener; |
| |
| /** |
| * Extend ValueAspectAdapter to listen to one or more |
| * tree aspects of the value in the wrapped value model. |
| */ |
| public class ValueTreeAdapter<T extends Model> |
| extends ValueAspectAdapter<T> |
| { |
| /** The names of the value's trees that we listen to. */ |
| protected final String[] treeNames; |
| |
| /** Listener that listens to the value. */ |
| protected final TreeChangeListener valueTreeListener; |
| |
| |
| // ********** constructors ********** |
| |
| /** |
| * Construct an adapter for the specified value trees. |
| */ |
| public ValueTreeAdapter(WritablePropertyValueModel<T> valueHolder, String... treeNames) { |
| super(valueHolder); |
| this.treeNames = treeNames; |
| this.valueTreeListener = this.buildValueTreeListener(); |
| } |
| |
| |
| // ********** initialization ********** |
| |
| protected TreeChangeListener buildValueTreeListener() { |
| return new TreeChangeListener() { |
| public void nodeAdded(TreeChangeEvent event) { |
| ValueTreeAdapter.this.valueAspectChanged(); |
| } |
| public void nodeRemoved(TreeChangeEvent event) { |
| ValueTreeAdapter.this.valueAspectChanged(); |
| } |
| public void treeCleared(TreeChangeEvent event) { |
| ValueTreeAdapter.this.valueAspectChanged(); |
| } |
| public void treeChanged(TreeChangeEvent event) { |
| ValueTreeAdapter.this.valueAspectChanged(); |
| } |
| @Override |
| public String toString() { |
| return "value tree listener: " + Arrays.asList(ValueTreeAdapter.this.treeNames); |
| } |
| }; |
| } |
| |
| |
| // ********** behavior ********** |
| |
| @Override |
| protected void engageValue_() { |
| for (String treeName : this.treeNames) { |
| this.value.addTreeChangeListener(treeName, this.valueTreeListener); |
| } |
| } |
| |
| @Override |
| protected void disengageValue_() { |
| for (String treeName : this.treeNames) { |
| this.value.removeTreeChangeListener(treeName, this.valueTreeListener); |
| } |
| } |
| |
| } |