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/*******************************************************************************
* Copyright (c) 2006, 2009 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 - bugs 208332, 146397, 249526
*******************************************************************************/
package org.eclipse.core.internal.databinding.observable;
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.IDisposeListener;
import org.eclipse.core.databinding.observable.IStaleListener;
import org.eclipse.core.databinding.observable.ObservableTracker;
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 implements 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 EmptyObservableSet(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 EmptyObservableSet(Realm realm, Object elementType) {
this.realm = realm;
this.elementType = elementType;
ObservableTracker.observableCreated(this);
}
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 boolean isEmpty() {
checkRealm();
return true;
}
public boolean 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 boolean add(Object o) {
throw new UnsupportedOperationException();
}
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
public boolean containsAll(Collection c) {
checkRealm();
return c.isEmpty();
}
public boolean addAll(Collection c) {
throw new UnsupportedOperationException();
}
public boolean retainAll(Collection c) {
throw new UnsupportedOperationException();
}
public boolean 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 void addDisposeListener(IDisposeListener listener) {
}
public void removeDisposeListener(IDisposeListener listener) {
}
public boolean isStale() {
checkRealm();
return false;
}
public boolean isDisposed() {
return false;
}
public void dispose() {
}
public Realm getRealm() {
return realm;
}
public boolean equals(Object obj) {
checkRealm();
if (obj == this)
return true;
if (obj == null)
return false;
if (!(obj instanceof Set))
return false;
return ((Set) obj).isEmpty();
}
public int hashCode() {
checkRealm();
return 0;
}
}
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