| /******************************************************************************* |
| * 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. |
| * |
| * @param <S> |
| * type of the source object |
| * @param <E> |
| * type of the elements in the set |
| * @since 1.2 |
| */ |
| public class UnionSetProperty<S, E> extends SetProperty<S, E> { |
| private final ISetProperty<S, E>[] properties; |
| private final Object elementTypeAsObject; |
| private final Class<E> elementType; |
| |
| /** |
| * @param properties |
| */ |
| public UnionSetProperty(ISetProperty<S, E>[] properties) { |
| this(properties, null); |
| } |
| |
| /** |
| * @param properties |
| * @param elementType |
| * @deprecated use the constuctor that takes a Class instead |
| */ |
| public UnionSetProperty(ISetProperty<S, E>[] properties, Object elementType) { |
| this.properties = properties; |
| this.elementTypeAsObject = elementType; |
| this.elementType = null; |
| } |
| |
| /** |
| * @param properties |
| * @param elementType |
| * @since 1.5 |
| */ |
| public UnionSetProperty(ISetProperty<S, E>[] properties, |
| Class<E> elementType) { |
| this.properties = properties; |
| this.elementTypeAsObject = elementType; |
| this.elementType = elementType; |
| } |
| |
| public Object getElementType() { |
| return elementTypeAsObject; |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| public Class<E> getElementClass() { |
| return elementType; |
| } |
| |
| protected Set<E> doGetSet(S source) { |
| Set<E> set = new HashSet<E>(); |
| for (int i = 0; i < properties.length; i++) |
| set.addAll(properties[i].getSet(source)); |
| return set; |
| } |
| |
| protected void doSetSet(S source, Set<E> set) { |
| throw new UnsupportedOperationException( |
| "UnionSetProperty is unmodifiable"); //$NON-NLS-1$ |
| } |
| |
| protected void doUpdateSet(S source, SetDiff<E> diff) { |
| throw new UnsupportedOperationException( |
| "UnionSetProperty is unmodifiable"); //$NON-NLS-1$ |
| } |
| |
| public IObservableSet<E> observe(Realm realm, S source) { |
| Set<IObservableSet<? extends E>> sets = new HashSet<IObservableSet<? extends E>>( |
| properties.length); |
| for (ISetProperty<S, E> property : properties) { |
| sets.add(property.observe(realm, source)); |
| } |
| IObservableSet<E> unionSet = new UnionSet<E>(sets, elementType); |
| |
| for (IObservableSet<? extends E> set : sets) { |
| PropertyObservableUtil.cascadeDispose(unionSet, set); |
| } |
| |
| return unionSet; |
| } |
| } |