/*******************************************************************************
* Copyright (c) 2009, 2010 Matthew Hall 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:
* Matthew Hall - initial API and implementation (bug 265727)
******************************************************************************/
package org.eclipse.core.databinding.property.set;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.observable.set.SetDiff;
import org.eclipse.core.databinding.observable.set.UnionSet;
import org.eclipse.core.internal.databinding.property.PropertyObservableUtil;
/**
* A set property for observing the union of multiple set properties a combined
* set.
*
* @since 1.2
*/
public class UnionSetProperty extends SetProperty {
private final ISetProperty[] properties;
private final Object elementType;
/**
* @param properties
*/
public UnionSetProperty(ISetProperty[] properties) {
this(properties, null);
}
/**
* @param properties
* @param elementType
*/
public UnionSetProperty(ISetProperty[] properties, Object elementType) {
this.properties = properties;
this.elementType = elementType;
}
public Object getElementType() {
return elementType;
}
protected Set doGetSet(Object source) {
Set set = new HashSet();
for (int i = 0; i < properties.length; i++)
set.addAll(properties[i].getSet(source));
return set;
}
protected void doSetSet(Object source, Set set) {
throw new UnsupportedOperationException(
"UnionSetProperty is unmodifiable"); //$NON-NLS-1$
}
protected void doUpdateSet(Object source, SetDiff diff) {
throw new UnsupportedOperationException(
"UnionSetProperty is unmodifiable"); //$NON-NLS-1$
}
public IObservableSet observe(Realm realm, Object source) {
IObservableSet[] sets = new IObservableSet[properties.length];
for (int i = 0; i < sets.length; i++)
sets[i] = properties[i].observe(realm, source);
IObservableSet unionSet = new UnionSet(sets, elementType);
for (int i = 0; i < sets.length; i++)
PropertyObservableUtil.cascadeDispose(unionSet, sets[i]);
return unionSet;
}
}