| /******************************************************************************* |
| * Copyright (c) 2006, 2007 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; |
| |
| /** |
| * Mutable (writable) implementation of {@link IObservableSet}. |
| * |
| * <p> |
| * This class is thread safe. All state accessing methods must be invoked from |
| * the {@link Realm#isCurrent() current realm}. Methods for adding and removing |
| * listeners may be invoked from any thread. |
| * </p> |
| * |
| * @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. |
| * |
| */ |
| public WritableSet() { |
| this(Realm.getDefault()); |
| } |
| |
| /** |
| * Construts a new instance with the default 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 |
| */ |
| 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) { |
| checkRealm(); |
| boolean added = wrappedSet.add(o); |
| if (added) { |
| fireSetChange(Diffs.createSetDiff(Collections.singleton(o), Collections.EMPTY_SET)); |
| } |
| return added; |
| } |
| |
| public boolean addAll(Collection c) { |
| checkRealm(); |
| 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) { |
| checkRealm(); |
| boolean removed = wrappedSet.remove(o); |
| if (removed) { |
| fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, Collections |
| .singleton(o))); |
| } |
| return removed; |
| } |
| |
| public boolean removeAll(Collection c) { |
| checkRealm(); |
| 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) { |
| checkRealm(); |
| 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() { |
| checkRealm(); |
| 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); |
| } |
| } |