Mercurial > projects > dwt2
view org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/EmptyObservableSet.d @ 96:b74ac5dfcc06
package to module and java.lang.all import
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:03:33 +0200 |
parents | 6208d4f6a277 |
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/******************************************************************************* * Copyright (c) 2006, 2008 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 * Matthew Hall - bug 208332 *******************************************************************************/ module org.eclipse.core.internal.databinding.observable.EmptyObservableSet; import java.lang.all; import java.util.Collection; import java.util.Collections; import java.util.Iterator; import java.util.Set; import org.eclipse.core.databinding.observable.IChangeListener; import org.eclipse.core.databinding.observable.IStaleListener; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.set.IObservableSet; import org.eclipse.core.databinding.observable.set.ISetChangeListener; import org.eclipse.core.runtime.Assert; /** * Singleton empty set */ public class EmptyObservableSet : IObservableSet { private static final Set emptySet = Collections.EMPTY_SET; private Realm realm; private Object elementType; /** * Creates a singleton empty set. This set may be disposed multiple times * without any side-effects. * * @param realm * the realm of the constructed set */ public this(Realm realm) { this(realm, null); } /** * Creates a singleton empty set. This set may be disposed multiple times * without any side-effects. * * @param realm * the realm of the constructed set * @param elementType * the element type of the constructed set * @since 1.1 */ public this(Realm realm, Object elementType) { this.realm = realm; this.elementType = elementType; } public void addSetChangeListener(ISetChangeListener listener) { } public void removeSetChangeListener(ISetChangeListener listener) { } public Object getElementType() { return elementType; } public int size() { checkRealm(); return 0; } private void checkRealm() { Assert.isTrue(realm.isCurrent(), "Observable cannot be accessed outside its realm"); //$NON-NLS-1$ } public bool isEmpty() { checkRealm(); return true; } public bool contains(Object o) { checkRealm(); return false; } public Iterator iterator() { checkRealm(); return emptySet.iterator(); } public Object[] toArray() { checkRealm(); return emptySet.toArray(); } public Object[] toArray(Object[] a) { return emptySet.toArray(a); } public bool add(Object o) { throw new UnsupportedOperationException(); } public bool remove(Object o) { throw new UnsupportedOperationException(); } public bool containsAll(Collection c) { checkRealm(); return c.isEmpty(); } public bool addAll(Collection c) { throw new UnsupportedOperationException(); } public bool retainAll(Collection c) { throw new UnsupportedOperationException(); } public bool removeAll(Collection c) { throw new UnsupportedOperationException(); } public void clear() { throw new UnsupportedOperationException(); } public void addChangeListener(IChangeListener listener) { } public void removeChangeListener(IChangeListener listener) { } public void addStaleListener(IStaleListener listener) { } public void removeStaleListener(IStaleListener listener) { } public bool isStale() { checkRealm(); return false; } public void dispose() { } public Realm getRealm() { return realm; } public override equals_t opEquals(Object obj) { checkRealm(); if (obj is this) return true; if (obj is null) return false; if (!( null !is cast(Set)obj )) return false; return (cast(Set) obj).isEmpty(); } public override hash_t toHash() { checkRealm(); return 0; } }