| /******************************************************************************* |
| * 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 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.observable; |
| |
| import java.util.Set; |
| |
| import org.eclipse.core.databinding.observable.set.AbstractObservableSet; |
| import org.eclipse.core.databinding.observable.set.IObservableSet; |
| import org.eclipse.core.databinding.observable.set.ISetChangeListener; |
| import org.eclipse.core.databinding.observable.set.SetChangeEvent; |
| |
| /** |
| * Wraps an observable set. This object acts like an exact copy of the original |
| * set, and tracks all the changes in the original. The only difference is that |
| * disposing the wrapper will not dispose the original. You can use this whenever |
| * you need to return an IObservableSet from a method that expects the caller |
| * to dispose the set, but you have an IObservableSet that you don't want disposed. |
| */ |
| public final class ProxyObservableSet extends AbstractObservableSet { |
| |
| private IObservableSet toDelegateTo; |
| private ISetChangeListener listener = new ISetChangeListener() { |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.internal.databinding.provisional.observable.set.ISetChangeListener#handleSetChange(org.eclipse.jface.internal.databinding.provisional.observable.set.IObservableSet, org.eclipse.jface.internal.databinding.provisional.observable.set.SetDiff) |
| */ |
| public void handleSetChange(SetChangeEvent event) { |
| fireSetChange(event.diff); |
| } |
| }; |
| |
| /** |
| * Constructs a DelegatingObservableSet that tracks the state of the given set. |
| * |
| * @param toDelegate |
| */ |
| public ProxyObservableSet(IObservableSet toDelegate) { |
| super(toDelegate.getRealm()); |
| this.toDelegateTo = toDelegate; |
| toDelegate.addSetChangeListener(listener); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.internal.databinding.provisional.observable.set.AbstractObservableSet#getWrappedSet() |
| */ |
| protected Set getWrappedSet() { |
| return toDelegateTo; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.internal.databinding.provisional.observable.set.IObservableSet#getElementType() |
| */ |
| public Object getElementType() { |
| return toDelegateTo.getElementType(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.internal.databinding.provisional.observable.set.AbstractObservableSet#dispose() |
| */ |
| public void dispose() { |
| toDelegateTo.removeSetChangeListener(listener); |
| super.dispose(); |
| } |
| } |