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/*******************************************************************************
* 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.model.Model;
import org.eclipse.jpt.utility.model.event.TreeChangeEvent;
import org.eclipse.jpt.utility.model.listener.TreeChangeListener;
import org.eclipse.jpt.utility.model.value.WritablePropertyValueModel;
/**
* 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);
}
}
}
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