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/*******************************************************************************
* Copyright (c) 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.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import org.eclipse.jpt.common.utility.internal.CollectionTools;
import org.eclipse.jpt.common.utility.internal.HashBag;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.iterators.ReadOnlyIterator;
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.value.CollectionValueModel;
import org.eclipse.jpt.common.utility.model.value.ListValueModel;
/**
* A <code>SetCollectionValueModel</code> wraps another
* {@link CollectionValueModel} and returns the items in the collection
* only once.
*/
public class SetCollectionValueModel<E>
extends CollectionValueModelWrapper<E>
implements CollectionValueModel<E>
{
private final HashBag<E> bag = new HashBag<E>();
// ********** constructors **********
/**
* Construct a collection value model with the specified wrapped
* collection value model and a filter that simply accepts every object.
*/
public SetCollectionValueModel(CollectionValueModel<? extends E> collectionHolder) {
super(collectionHolder);
}
/**
* Construct a collection value model with the specified wrapped
* list value model and a filter that simply accepts every object.
*/
public SetCollectionValueModel(ListValueModel<E> listHolder) {
this(new ListCollectionValueModelAdapter<E>(listHolder));
}
// ********** CollectionValueModel implementation **********
public Iterator<E> iterator() {
return new ReadOnlyIterator<E>(this.bag.uniqueIterator());
}
public int size() {
return this.bag.uniqueCount();
}
// ********** CollectionValueModelWrapper overrides/implementation **********
@Override
protected void engageModel() {
super.engageModel();
// synch our cache *after* we start listening to the nested collection,
// since its value might change when a listener is added
CollectionTools.addAll(this.bag, this.collectionHolder);
}
@Override
protected void disengageModel() {
super.disengageModel();
// clear out the cache when we are not listening to the nested collection
this.bag.clear();
}
@Override
protected void itemsAdded(CollectionAddEvent event) {
ArrayList<E> addedItems = new ArrayList<E>(event.getItemsSize());
int uniqueCount = this.bag.uniqueCount();
for (E item : this.getItems(event)) {
this.bag.add(item);
if (this.bag.uniqueCount() > uniqueCount) {
uniqueCount = this.bag.uniqueCount();
addedItems.add(item);
}
}
this.fireItemsAdded(VALUES, addedItems);
}
@Override
protected void itemsRemoved(CollectionRemoveEvent event) {
ArrayList<E> removedItems = new ArrayList<E>(event.getItemsSize());
int uniqueCount = this.bag.uniqueCount();
for (E item : this.getItems(event)) {
if (this.bag.remove(item)) {
if (this.bag.uniqueCount() < uniqueCount) {
uniqueCount = this.bag.uniqueCount();
removedItems.add(item);
}
} else {
throw new IllegalStateException("missing item: " + item); //$NON-NLS-1$
}
}
this.fireItemsRemoved(VALUES, removedItems);
}
@Override
protected void collectionCleared(CollectionClearEvent event) {
this.clearCollection(this.bag, VALUES);
}
@Override
protected void collectionChanged(CollectionChangeEvent event) {
this.bag.clear();
CollectionTools.addAll(this.bag, this.collectionHolder);
this.fireCollectionChanged(VALUES, new HashSet<E>(this.bag));
}
@Override
public void toString(StringBuilder sb) {
StringTools.append(sb, this);
}
}
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