| /******************************************************************************* |
| * Copyright (c) 2006-2008 Cerner 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: |
| * Brad Reynolds - initial API and implementation |
| * Matthew Hall - bug 208332 |
| ******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.observable; |
| |
| import org.eclipse.core.databinding.observable.IStaleListener; |
| import org.eclipse.core.databinding.observable.StaleEvent; |
| import org.eclipse.core.databinding.observable.list.IListChangeListener; |
| import org.eclipse.core.databinding.observable.list.IObservableList; |
| import org.eclipse.core.databinding.observable.list.ListChangeEvent; |
| import org.eclipse.core.databinding.observable.list.ObservableList; |
| |
| /** |
| * ObservableList implementation that prevents modification by consumers. Events |
| * in the originating wrapped list are propagated and thrown from this instance |
| * when appropriate. All mutators throw an UnsupportedOperationException. |
| * |
| * @since 1.0 |
| */ |
| /* |
| * Implementation makes the assumption that the superclass (ObservableList) is |
| * unmodifiable and that all modify methods throw an |
| * UnsupportedOperationException. |
| */ |
| public class UnmodifiableObservableList extends ObservableList { |
| /** |
| * List that is being made unmodifiable. |
| */ |
| private IObservableList wrappedList; |
| |
| private IListChangeListener listChangeListener = new IListChangeListener() { |
| public void handleListChange(ListChangeEvent event) { |
| // Fires a Change and then ListChange event. |
| fireListChange(event.diff); |
| } |
| }; |
| |
| private IStaleListener staleListener = new IStaleListener() { |
| public void handleStale(StaleEvent event) { |
| fireStale(); |
| } |
| }; |
| |
| /** |
| * @param wrappedList |
| */ |
| public UnmodifiableObservableList(IObservableList wrappedList) { |
| super(wrappedList.getRealm(), wrappedList, wrappedList.getElementType()); |
| this.wrappedList = wrappedList; |
| |
| wrappedList.addListChangeListener(listChangeListener); |
| |
| wrappedList.addStaleListener(staleListener); |
| } |
| |
| /** |
| * Because this instance is immutable staleness cannot be changed. |
| * |
| * @throws UnsupportedOperationException |
| * because this instance is unmodifiable. |
| */ |
| public void setStale(boolean stale) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean isStale() { |
| getterCalled(); |
| return wrappedList == null ? false : wrappedList.isStale(); |
| } |
| |
| public synchronized void dispose() { |
| if (wrappedList != null) { |
| wrappedList.removeListChangeListener(listChangeListener); |
| wrappedList.removeStaleListener(staleListener); |
| wrappedList = null; |
| } |
| listChangeListener = null; |
| staleListener = null; |
| super.dispose(); |
| } |
| } |