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/*******************************************************************************
* Copyright (c) 2007, 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.CollectionChangeEvent;
import org.eclipse.jpt.utility.model.listener.CollectionChangeListener;
import org.eclipse.jpt.utility.model.value.WritablePropertyValueModel;
/**
* Extend ValueAspectAdapter to listen to one or more collection
* aspects of the value in the wrapped value model.
*/
public class ValueCollectionAdapter<T extends Model>
extends ValueAspectAdapter<T>
{
/** The names of the value's collections that we listen to. */
protected final String[] collectionNames;
/** Listener that listens to the value. */
protected final CollectionChangeListener valueCollectionListener;
// ********** constructors **********
/**
* Construct an adapter for the specified value collections.
*/
public ValueCollectionAdapter(WritablePropertyValueModel<T> valueHolder, String... collectionNames) {
super(valueHolder);
this.collectionNames = collectionNames;
this.valueCollectionListener = this.buildValueCollectionListener();
}
// ********** initialization **********
/**
* All we really care about is the fact that a Collection aspect has
* changed. Do the same thing no matter which event occurs.
*/
protected CollectionChangeListener buildValueCollectionListener() {
return new CollectionChangeListener() {
public void itemsAdded(CollectionChangeEvent event) {
ValueCollectionAdapter.this.valueAspectChanged();
}
public void itemsRemoved(CollectionChangeEvent event) {
ValueCollectionAdapter.this.valueAspectChanged();
}
public void collectionCleared(CollectionChangeEvent event) {
ValueCollectionAdapter.this.valueAspectChanged();
}
public void collectionChanged(CollectionChangeEvent event) {
ValueCollectionAdapter.this.valueAspectChanged();
}
@Override
public String toString() {
return "value collection listener: " + Arrays.asList(ValueCollectionAdapter.this.collectionNames);
}
};
}
@Override
protected void engageValue_() {
for (String collectionName : this.collectionNames) {
this.value.addCollectionChangeListener(collectionName, this.valueCollectionListener);
}
}
@Override
protected void disengageValue_() {
for (String collectionName : this.collectionNames) {
this.value.removeCollectionChangeListener(collectionName, this.valueCollectionListener);
}
}
}
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