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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
* Brad Reynolds - bug 147515
******************************************************************************/
package org.eclipse.core.databinding.observable.set;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.Realm;
/**
* @since 1.0
*
*/
public class WritableSet extends ObservableSet {
/**
* Constructs a new instance with the default realm, empty list, and a
* <code>null</code> element type.
*
* @param realm
* @param wrappedSet
*/
public WritableSet() {
this(Realm.getDefault());
}
/**
* Construts a new instance with the default realm.
*
* @param realm
* @param c
* @param elementType
* can be <code>null</code>
*/
public WritableSet(Collection c, Object elementType) {
this(Realm.getDefault(), new HashSet(c), elementType);
}
/**
* Constructs a new instance with an empty list and a <code>null</code> element type.
*
* @param realm
* @param wrappedSet
*/
public WritableSet(Realm realm) {
this(realm, new HashSet(), null);
}
/**
* Constructs a new instance.
*
* @param realm
* @param c
* @param elementType
* can be <code>null</code>
*/
public WritableSet(Realm realm, Collection c, Object elementType) {
super(realm, new HashSet(c), elementType);
this.elementType = elementType;
}
public boolean add(Object o) {
boolean added = wrappedSet.add(o);
if (added) {
fireSetChange(Diffs.createSetDiff(Collections.singleton(o), Collections.EMPTY_SET));
}
return added;
}
public boolean addAll(Collection c) {
Set adds = new HashSet();
Iterator it = c.iterator();
while (it.hasNext()) {
Object element = it.next();
if (wrappedSet.add(element)) {
adds.add(element);
}
}
if (adds.size() > 0) {
fireSetChange(Diffs.createSetDiff(adds, Collections.EMPTY_SET));
return true;
}
return false;
}
public boolean remove(Object o) {
boolean removed = wrappedSet.remove(o);
if (removed) {
fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, Collections
.singleton(o)));
}
return removed;
}
public boolean removeAll(Collection c) {
Set removes = new HashSet();
Iterator it = c.iterator();
while (it.hasNext()) {
Object element = it.next();
if (wrappedSet.remove(element)) {
removes.add(element);
}
}
if (removes.size() > 0) {
fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
return true;
}
return false;
}
public boolean retainAll(Collection c) {
Set removes = new HashSet();
Iterator it = wrappedSet.iterator();
while (it.hasNext()) {
Object element = it.next();
if (!c.contains(element)) {
it.remove();
removes.add(element);
}
}
if (removes.size() > 0) {
fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
return true;
}
return false;
}
public void clear() {
Set removes = new HashSet(wrappedSet);
wrappedSet.clear();
fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
}
/**
* @param elementType can be <code>null</code>
* @return new instance with the default realm
*/
public static WritableSet withElementType(Object elementType) {
return new WritableSet(Realm.getDefault(), new HashSet(), elementType);
}
}
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