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/*******************************************************************************
* Copyright (c) 2007, 2009 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.common.utility.internal.model.value;
import java.util.Arrays;
import java.util.Collection;
import org.eclipse.jpt.common.utility.model.Model;
import org.eclipse.jpt.common.utility.model.event.TreeAddEvent;
import org.eclipse.jpt.common.utility.model.event.TreeChangeEvent;
import org.eclipse.jpt.common.utility.model.event.TreeClearEvent;
import org.eclipse.jpt.common.utility.model.event.TreeRemoveEvent;
import org.eclipse.jpt.common.utility.model.listener.TreeChangeListener;
import org.eclipse.jpt.common.utility.model.value.PropertyValueModel;
/**
* This extension of {@link AspectTreeValueModelAdapter} provides
* basic tree change support.
* This converts a set of one or more trees into
* a single {@link #NODES} tree.
* <p>
* The typical subclass will override the following methods (see the descriptions
* in {@link AspectTreeValueModelAdapter}):<ul>
* <li>{@link #nodes_()}
* <li>{@link #nodes()}
* </ul>
*/
public abstract class TreeAspectAdapter<S extends Model, E>
extends AspectTreeValueModelAdapter<S, E>
{
/**
* The name of the subject's trees that we use for the value.
*/
protected final String[] treeNames;
protected static final String[] EMPTY_TREE_NAMES = new String[0];
/** A listener that listens to the subject's tree aspects. */
protected final TreeChangeListener treeChangeListener;
// ********** constructors **********
/**
* Construct a tree aspect adapter for the specified subject
* and tree.
*/
protected TreeAspectAdapter(String treeName, S subject) {
this(new String[] {treeName}, subject);
}
/**
* Construct a tree aspect adapter for the specified subject
* and trees.
*/
protected TreeAspectAdapter(String[] treeNames, S subject) {
this(new StaticPropertyValueModel<S>(subject), treeNames);
}
/**
* Construct a tree aspect adapter for the specified subject holder
* and trees.
*/
protected TreeAspectAdapter(PropertyValueModel<? extends S> subjectHolder, String... treeNames) {
super(subjectHolder);
this.treeNames = treeNames;
this.treeChangeListener = this.buildTreeChangeListener();
}
/**
* Construct a tree aspect adapter for the specified subject holder
* and trees.
*/
protected TreeAspectAdapter(PropertyValueModel<? extends S> subjectHolder, Collection<String> treeNames) {
this(subjectHolder, treeNames.toArray(new String[treeNames.size()]));
}
/**
* Construct a tree aspect adapter for an "unchanging" tree in
* the specified subject. This is useful for a tree aspect that does not
* change for a particular subject; but the subject will change, resulting in
* a new tree.
*/
protected TreeAspectAdapter(PropertyValueModel<? extends S> subjectHolder) {
this(subjectHolder, EMPTY_TREE_NAMES);
}
// ********** initialization **********
protected TreeChangeListener buildTreeChangeListener() {
// transform the subject's tree change events into VALUE tree change events
return new TreeChangeListener() {
public void nodeAdded(TreeAddEvent event) {
TreeAspectAdapter.this.nodeAdded(event);
}
public void nodeRemoved(TreeRemoveEvent event) {
TreeAspectAdapter.this.nodeRemoved(event);
}
public void treeCleared(TreeClearEvent event) {
TreeAspectAdapter.this.treeCleared(event);
}
public void treeChanged(TreeChangeEvent event) {
TreeAspectAdapter.this.treeChanged(event);
}
@Override
public String toString() {
return "tree change listener: " + Arrays.asList(TreeAspectAdapter.this.treeNames); //$NON-NLS-1$
}
};
}
// ********** AspectAdapter implementation **********
@Override
protected void engageSubject_() {
for (String treeName : this.treeNames) {
((Model) this.subject).addTreeChangeListener(treeName, this.treeChangeListener);
}
}
@Override
protected void disengageSubject_() {
for (String treeName : this.treeNames) {
((Model) this.subject).removeTreeChangeListener(treeName, this.treeChangeListener);
}
}
// ********** behavior **********
protected void nodeAdded(TreeAddEvent event) {
this.fireNodeAdded(event.clone(this, NODES));
}
protected void nodeRemoved(TreeRemoveEvent event) {
this.fireNodeRemoved(event.clone(this, NODES));
}
protected void treeCleared(TreeClearEvent event) {
this.fireTreeCleared(event.clone(this, NODES));
}
protected void treeChanged(TreeChangeEvent event) {
this.fireTreeChanged(event.clone(this, NODES));
}
}
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