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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 org.eclipse.jpt.common.utility.model.Model;
import org.eclipse.jpt.common.utility.model.event.CollectionAddEvent;
import org.eclipse.jpt.common.utility.model.event.CollectionChangeEvent;
import org.eclipse.jpt.common.utility.model.event.CollectionClearEvent;
import org.eclipse.jpt.common.utility.model.event.CollectionRemoveEvent;
import org.eclipse.jpt.common.utility.model.listener.CollectionChangeListener;
import org.eclipse.jpt.common.utility.model.value.CollectionValueModel;
import org.eclipse.jpt.common.utility.model.value.ListValueModel;
/**
* Extend {@link ItemAspectListValueModelAdapter} to listen to one or more collection
* aspects of each item in the wrapped list model.
*/
public class ItemCollectionListValueModelAdapter<E>
extends ItemAspectListValueModelAdapter<E>
{
/** The names of the items' collections that we listen to. */
protected final String[] collectionNames;
/** Listener that listens to all the items in the list. */
protected final CollectionChangeListener itemCollectionListener;
// ********** constructors **********
/**
* Construct an adapter for the specified item Collections.
*/
public ItemCollectionListValueModelAdapter(ListValueModel<E> listHolder, String... collectionNames) {
super(listHolder);
this.collectionNames = collectionNames;
this.itemCollectionListener = this.buildItemCollectionListener();
}
/**
* Construct an adapter for the specified item Collections.
*/
public ItemCollectionListValueModelAdapter(CollectionValueModel<E> collectionHolder, String... collectionNames) {
this(new CollectionListValueModelAdapter<E>(collectionHolder), collectionNames);
}
// ********** 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 buildItemCollectionListener() {
return new CollectionChangeListener() {
public void itemsAdded(CollectionAddEvent event) {
ItemCollectionListValueModelAdapter.this.itemAspectChanged(event);
}
public void itemsRemoved(CollectionRemoveEvent event) {
ItemCollectionListValueModelAdapter.this.itemAspectChanged(event);
}
public void collectionCleared(CollectionClearEvent event) {
ItemCollectionListValueModelAdapter.this.itemAspectChanged(event);
}
public void collectionChanged(CollectionChangeEvent event) {
ItemCollectionListValueModelAdapter.this.itemAspectChanged(event);
}
@Override
public String toString() {
return "item collection listener: " + Arrays.asList(ItemCollectionListValueModelAdapter.this.collectionNames); //$NON-NLS-1$
}
};
}
// ********** behavior **********
@Override
protected void engageItem_(Model item) {
for (String collectionName : this.collectionNames) {
item.addCollectionChangeListener(collectionName, this.itemCollectionListener);
}
}
@Override
protected void disengageItem_(Model item) {
for (String collectionName : this.collectionNames) {
item.removeCollectionChangeListener(collectionName, this.itemCollectionListener);
}
}
}
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