| /******************************************************************************* |
| * 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 |
| * Brad Reynolds - bug 171616 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.internal.databinding.internal.beans; |
| |
| import java.beans.PropertyChangeListener; |
| import java.beans.PropertyDescriptor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.core.databinding.beans.IBeanObservable; |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.core.databinding.observable.set.ObservableSet; |
| import org.eclipse.core.runtime.Assert; |
| |
| /** |
| * @since 1.0 |
| * |
| */ |
| public class JavaBeanObservableSet extends ObservableSet implements IBeanObservable { |
| |
| private final Object object; |
| |
| private PropertyChangeListener collectionListener = new PropertyChangeListener() { |
| public void propertyChange(java.beans.PropertyChangeEvent event) { |
| if (!updating) { |
| Set newElements = new HashSet(Arrays.asList(getValues())); |
| Set addedElements = new HashSet(newElements); |
| Set removedElements = new HashSet(wrappedSet); |
| // remove all new elements from old elements to compute the |
| // removed elements |
| removedElements.removeAll(newElements); |
| addedElements.removeAll(wrappedSet); |
| wrappedSet = newElements; |
| fireSetChange(Diffs.createSetDiff(addedElements, |
| removedElements)); |
| } |
| } |
| }; |
| |
| private boolean updating = false; |
| |
| private PropertyDescriptor descriptor; |
| |
| private ListenerSupport collectionListenSupport; |
| |
| /** |
| * @param realm |
| * @param object |
| * @param descriptor |
| * @param elementType |
| */ |
| public JavaBeanObservableSet(Realm realm, Object object, PropertyDescriptor descriptor, |
| Class elementType) { |
| super(realm, new HashSet(), elementType); |
| this.object = object; |
| this.descriptor = descriptor; |
| this.collectionListenSupport = new ListenerSupport(collectionListener, descriptor.getName()); |
| |
| wrappedSet.addAll(Arrays.asList(getValues())); |
| } |
| |
| protected void firstListenerAdded() { |
| collectionListenSupport.hookListener(this.object); |
| } |
| |
| protected void lastListenerRemoved() { |
| if (collectionListenSupport != null) { |
| collectionListenSupport.dispose(); |
| } |
| } |
| |
| private Object primGetValues() { |
| try { |
| Method readMethod = descriptor.getReadMethod(); |
| if (!readMethod.isAccessible()) { |
| readMethod.setAccessible(true); |
| } |
| return readMethod.invoke(object, new Object[0]); |
| } catch (IllegalArgumentException e) { |
| } catch (IllegalAccessException e) { |
| } catch (InvocationTargetException e) { |
| } |
| Assert.isTrue(false, "Could not read collection values"); //$NON-NLS-1$ |
| return null; |
| } |
| |
| private Object[] getValues() { |
| Object[] values = null; |
| |
| Object result = primGetValues(); |
| if (descriptor.getPropertyType().isArray()) |
| values = (Object[]) result; |
| else { |
| // TODO add jUnit for POJO (var. SettableValue) collections |
| Collection list = (Collection) result; |
| if (list != null) { |
| values = list.toArray(); |
| } else { |
| values = new Object[] {}; |
| } |
| } |
| return values; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.core.databinding.beans.IBeanObservable#getObserved() |
| */ |
| public Object getObserved() { |
| return object; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.core.databinding.beans.IBeanObservable#getPropertyDescriptor() |
| */ |
| public PropertyDescriptor getPropertyDescriptor() { |
| return descriptor; |
| } |
| |
| } |