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/*******************************************************************************
* Copyright (c) 2007, 2012 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.Collection;
import java.util.Iterator;
import org.eclipse.jpt.common.utility.internal.collection.CollectionTools;
import org.eclipse.jpt.common.utility.internal.collection.HashBag;
import org.eclipse.jpt.common.utility.internal.model.AbstractModel;
import org.eclipse.jpt.common.utility.internal.model.ChangeSupport;
import org.eclipse.jpt.common.utility.internal.model.SingleAspectChangeSupport;
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.ModifiableCollectionValueModel;
/**
* Implementation of {@link ModifiableCollectionValueModel} and {@link Collection}
* that simply holds a collection and notifies listeners of any changes.
*/
public class SimpleCollectionValueModel<E>
extends AbstractModel
implements ModifiableCollectionValueModel<E>, Collection<E>
{
/** The collection. */
protected final Collection<E> collection;
// ********** constructors **********
/**
* Construct a collection value model for the specified collection.
*/
public SimpleCollectionValueModel(Collection<E> collection) {
super();
if (collection == null) {
throw new NullPointerException();
}
this.collection = collection;
}
/**
* Construct a collection value model with an empty initial collection.
*/
public SimpleCollectionValueModel() {
this(new HashBag<E>());
}
@Override
protected ChangeSupport buildChangeSupport() {
return new SingleAspectChangeSupport(this, CollectionChangeListener.class, VALUES);
}
// ********** CollectionValueModel implementation **********
public Iterator<E> iterator() {
return new LocalIterator<E>(this.collection.iterator());
}
public int size() {
return this.collection.size();
}
// ********** WritableCollectionValueModel implementation **********
/**
* Allow the collection's elements to be replaced.
*/
public void setValues(Iterable<E> values) {
if (values == null) {
throw new NullPointerException();
}
this.collection.clear();
CollectionTools.addAll(this.collection, values);
this.fireCollectionChanged(VALUES, this.collection);
}
// ********** Collection implementation **********
public boolean isEmpty() {
return this.collection.isEmpty();
}
public boolean contains(Object o) {
return this.collection.contains(o);
}
public Object[] toArray() {
return this.collection.toArray();
}
public <T extends Object> T[] toArray(T[] a) {
return this.collection.toArray(a);
}
public boolean add(E o) {
return this.addItemToCollection(o, this.collection, VALUES);
}
public boolean remove(Object o) {
return this.removeItemFromCollection(o, this.collection, VALUES);
}
public boolean containsAll(Collection<?> c) {
return this.collection.containsAll(c);
}
public boolean addAll(Collection<? extends E> c) {
return this.addItemsToCollection(c, this.collection, VALUES);
}
public boolean removeAll(Collection<?> c) {
return this.removeItemsFromCollection(c, this.collection, VALUES);
}
public boolean retainAll(Collection<?> c) {
return this.retainItemsInCollection(c, this.collection, VALUES);
}
public void clear() {
this.clearCollection(this.collection, VALUES);
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if ((o instanceof Collection<?>) && (o instanceof CollectionValueModel<?>)) {
Collection<E> c1 = CollectionTools.collection(this.collection);
@SuppressWarnings("unchecked")
Collection<E> c2 = CollectionTools.collection(((Collection<E>) o).iterator());
return c1.equals(c2);
}
return false;
}
@Override
public int hashCode() {
return CollectionTools.collection(this.collection).hashCode();
}
// ********** miscellaneous **********
@Override
public void toString(StringBuilder sb) {
sb.append(this.collection);
}
// ********** iterator **********
private class LocalIterator<T> implements Iterator<T> {
private final Iterator<T> iterator;
private T next;
LocalIterator(Iterator<T> iterator) {
super();
this.iterator = iterator;
}
public boolean hasNext() {
return this.iterator.hasNext();
}
public T next() {
return this.next = this.iterator.next();
}
@SuppressWarnings("synthetic-access")
public void remove() {
this.iterator.remove();
SimpleCollectionValueModel.this.fireItemRemoved(VALUES, this.next);
}
}
}
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