| /******************************************************************************* |
| * Copyright (c) 2008 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 194734) |
| ******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.property.set; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.ConcurrentModificationException; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.databinding.observable.set.AbstractObservableSet; |
| import org.eclipse.core.databinding.observable.set.SetDiff; |
| import org.eclipse.core.databinding.property.INativePropertyListener; |
| import org.eclipse.core.databinding.property.IProperty; |
| import org.eclipse.core.databinding.property.IPropertyObservable; |
| import org.eclipse.core.databinding.property.ISimplePropertyListener; |
| import org.eclipse.core.databinding.property.SimplePropertyEvent; |
| import org.eclipse.core.databinding.property.set.SimpleSetProperty; |
| |
| /** |
| * @since 1.2 |
| * |
| */ |
| public class SimpleSetPropertyObservableSet extends AbstractObservableSet |
| implements IPropertyObservable { |
| private Object source; |
| private SimpleSetProperty property; |
| |
| private volatile boolean updating = false; |
| |
| private volatile int modCount = 0; |
| |
| private INativePropertyListener listener; |
| |
| private Set cachedSet; |
| |
| /** |
| * @param realm |
| * @param source |
| * @param property |
| */ |
| public SimpleSetPropertyObservableSet(Realm realm, Object source, |
| SimpleSetProperty property) { |
| super(realm); |
| this.source = source; |
| this.property = property; |
| } |
| |
| protected void firstListenerAdded() { |
| if (!isDisposed()) { |
| cachedSet = getSet(); |
| |
| if (listener == null) { |
| listener = property |
| .adaptListener(new ISimplePropertyListener() { |
| public void handlePropertyChange( |
| final SimplePropertyEvent event) { |
| modCount++; |
| if (!isDisposed() && !updating) { |
| getRealm().exec(new Runnable() { |
| public void run() { |
| notifyIfChanged((SetDiff) event.diff); |
| } |
| }); |
| } |
| } |
| }); |
| } |
| property.addListener(source, listener); |
| } |
| } |
| |
| protected void lastListenerRemoved() { |
| if (listener != null) { |
| property.removeListener(source, listener); |
| } |
| |
| cachedSet = null; |
| } |
| |
| protected Set getWrappedSet() { |
| return getSet(); |
| } |
| |
| public Object getElementType() { |
| return property.getElementType(); |
| } |
| |
| // Queries |
| |
| private Set getSet() { |
| return property.getSet(source); |
| } |
| |
| public boolean contains(Object o) { |
| getterCalled(); |
| return getSet().contains(o); |
| } |
| |
| public boolean containsAll(Collection c) { |
| getterCalled(); |
| return getSet().containsAll(c); |
| } |
| |
| public boolean isEmpty() { |
| getterCalled(); |
| return getSet().isEmpty(); |
| } |
| |
| public Object[] toArray() { |
| getterCalled(); |
| return getSet().toArray(); |
| } |
| |
| public Object[] toArray(Object[] a) { |
| getterCalled(); |
| return getSet().toArray(a); |
| } |
| |
| // Single change operations |
| |
| public boolean add(Object o) { |
| checkRealm(); |
| |
| Set set = new HashSet(getSet()); |
| if (!set.add(o)) |
| return false; |
| |
| SetDiff diff = Diffs.createSetDiff(Collections.singleton(o), |
| Collections.EMPTY_SET); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, set, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| |
| return true; |
| } |
| |
| public Iterator iterator() { |
| getterCalled(); |
| return new Iterator() { |
| int expectedModCount = modCount; |
| Set set = new HashSet(getSet()); |
| Iterator iterator = set.iterator(); |
| Object last = null; |
| |
| public boolean hasNext() { |
| getterCalled(); |
| checkForComodification(); |
| return iterator.hasNext(); |
| } |
| |
| public Object next() { |
| getterCalled(); |
| checkForComodification(); |
| last = iterator.next(); |
| return last; |
| } |
| |
| public void remove() { |
| checkRealm(); |
| checkForComodification(); |
| |
| iterator.remove(); // stay in sync |
| SetDiff diff = Diffs.createSetDiff(Collections.EMPTY_SET, |
| Collections.singleton(last)); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, set, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| |
| last = null; |
| expectedModCount = modCount; |
| } |
| |
| private void checkForComodification() { |
| if (expectedModCount != modCount) |
| throw new ConcurrentModificationException(); |
| } |
| }; |
| } |
| |
| public boolean remove(Object o) { |
| getterCalled(); |
| |
| Set set = new HashSet(getSet()); |
| if (!set.remove(o)) |
| return false; |
| |
| SetDiff diff = Diffs.createSetDiff(Collections.EMPTY_SET, Collections |
| .singleton(o)); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, set, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| |
| return true; |
| } |
| |
| // Bulk change operations |
| |
| public boolean addAll(Collection c) { |
| getterCalled(); |
| |
| if (c.isEmpty()) |
| return false; |
| |
| Set set = new HashSet(getSet()); |
| |
| Set additions = new HashSet(c); |
| for (Iterator it = c.iterator(); it.hasNext();) { |
| Object element = it.next(); |
| if (set.add(element)) |
| additions.add(element); |
| } |
| |
| if (additions.isEmpty()) |
| return false; |
| |
| SetDiff diff = Diffs.createSetDiff(additions, Collections.EMPTY_SET); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, set, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| |
| return true; |
| } |
| |
| public boolean removeAll(Collection c) { |
| getterCalled(); |
| |
| Set set = getSet(); |
| if (set.isEmpty()) |
| return false; |
| if (c.isEmpty()) |
| return false; |
| |
| set = new HashSet(set); |
| |
| Set removals = new HashSet(c); |
| for (Iterator it = c.iterator(); it.hasNext();) { |
| Object element = it.next(); |
| if (set.remove(element)) |
| removals.add(element); |
| } |
| |
| if (removals.isEmpty()) |
| return false; |
| |
| SetDiff diff = Diffs.createSetDiff(Collections.EMPTY_SET, removals); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, set, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| |
| return true; |
| } |
| |
| public boolean retainAll(Collection c) { |
| getterCalled(); |
| |
| Set set = getSet(); |
| if (set.isEmpty()) |
| return false; |
| |
| if (c.isEmpty()) { |
| clear(); |
| return true; |
| } |
| |
| set = new HashSet(set); |
| |
| Set removals = new HashSet(); |
| for (Iterator it = set.iterator(); it.hasNext();) { |
| Object element = it.next(); |
| if (!c.contains(element)) { |
| it.remove(); |
| removals.add(element); |
| } |
| } |
| |
| if (removals.isEmpty()) |
| return false; |
| |
| SetDiff diff = Diffs.createSetDiff(Collections.EMPTY_SET, removals); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, set, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| |
| return true; |
| } |
| |
| public void clear() { |
| getterCalled(); |
| |
| Set set = getSet(); |
| if (set.isEmpty()) |
| return; |
| |
| SetDiff diff = Diffs.createSetDiff(Collections.EMPTY_SET, set); |
| |
| boolean wasUpdating = updating; |
| updating = true; |
| try { |
| property.setSet(source, Collections.EMPTY_SET, diff); |
| modCount++; |
| } finally { |
| updating = wasUpdating; |
| } |
| |
| notifyIfChanged(null); |
| } |
| |
| private void notifyIfChanged(SetDiff diff) { |
| if (hasListeners()) { |
| Set oldSet = cachedSet; |
| Set newSet = cachedSet = property.getSet(source); |
| if (diff == null) |
| diff = Diffs.computeSetDiff(oldSet, newSet); |
| if (!diff.isEmpty()) |
| fireSetChange(diff); |
| } |
| } |
| |
| public boolean equals(Object o) { |
| getterCalled(); |
| return getSet().equals(o); |
| } |
| |
| public int hashCode() { |
| getterCalled(); |
| return getSet().hashCode(); |
| } |
| |
| public Object getObserved() { |
| return source; |
| } |
| |
| public IProperty getProperty() { |
| return property; |
| } |
| |
| public synchronized void dispose() { |
| if (!isDisposed()) { |
| if (listener != null) |
| property.removeListener(source, listener); |
| property = null; |
| source = null; |
| listener = null; |
| } |
| super.dispose(); |
| } |
| } |