| /******************************************************************************* |
| * Copyright (c) 2005, 2008 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 164653 |
| * Brad Reynolds - bug 164134, 171616 |
| *******************************************************************************/ |
| package org.eclipse.core.internal.databinding.beans; |
| |
| import java.beans.PropertyChangeListener; |
| import java.beans.PropertyDescriptor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import org.eclipse.core.databinding.BindingException; |
| import org.eclipse.core.databinding.beans.BeansObservables; |
| 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.value.AbstractObservableValue; |
| import org.eclipse.core.databinding.observable.value.ValueDiff; |
| import org.eclipse.core.databinding.util.Policy; |
| import org.eclipse.core.internal.databinding.Util; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| |
| /** |
| * @since 1.0 |
| * |
| */ |
| public class JavaBeanObservableValue extends AbstractObservableValue implements IBeanObservable { |
| private final Object object; |
| private boolean updating = false; |
| |
| private final PropertyDescriptor propertyDescriptor; |
| private ListenerSupport listenerSupport; |
| |
| private boolean attachListeners; |
| |
| /** |
| * @param realm |
| * @param object |
| * @param descriptor |
| */ |
| public JavaBeanObservableValue(Realm realm, Object object, |
| PropertyDescriptor descriptor) { |
| this(realm, object, descriptor, true); |
| } |
| |
| /** |
| * @param realm |
| * @param object |
| * @param descriptor |
| * @param attachListeners |
| */ |
| public JavaBeanObservableValue(Realm realm, Object object, |
| PropertyDescriptor descriptor, boolean attachListeners) { |
| super(realm); |
| this.object = object; |
| this.propertyDescriptor = descriptor; |
| this.attachListeners = attachListeners; |
| } |
| |
| protected void firstListenerAdded() { |
| if (!attachListeners) { |
| return; |
| } |
| |
| PropertyChangeListener listener = new PropertyChangeListener() { |
| public void propertyChange(java.beans.PropertyChangeEvent event) { |
| if (!updating) { |
| final ValueDiff diff = Diffs.createValueDiff(event.getOldValue(), |
| event.getNewValue()); |
| getRealm().exec(new Runnable(){ |
| public void run() { |
| fireValueChange(diff); |
| }}); |
| } |
| } |
| }; |
| |
| if (listenerSupport == null) { |
| listenerSupport = new ListenerSupport(listener, propertyDescriptor.getName()); |
| } |
| |
| listenerSupport.hookListener(object); |
| } |
| |
| public void doSetValue(Object value) { |
| updating = true; |
| try { |
| Object oldValue = doGetValue(); |
| |
| if (Util.equals(oldValue, value)) { |
| return; |
| } |
| |
| Method writeMethod = propertyDescriptor.getWriteMethod(); |
| if (!writeMethod.isAccessible()) { |
| writeMethod.setAccessible(true); |
| } |
| writeMethod.invoke(object, new Object[] { value }); |
| fireValueChange(Diffs.createValueDiff(oldValue, doGetValue())); |
| } catch (InvocationTargetException e) { |
| /* |
| * InvocationTargetException wraps any exception thrown by the |
| * invoked method. |
| */ |
| throw new RuntimeException(e.getCause()); |
| } catch (Exception e) { |
| if (BeansObservables.DEBUG) { |
| Policy |
| .getLog() |
| .log( |
| new Status( |
| IStatus.WARNING, |
| Policy.JFACE_DATABINDING, |
| IStatus.OK, |
| "Could not change value of " + object + "." + propertyDescriptor.getName(), e)); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| } finally { |
| updating = false; |
| } |
| } |
| |
| public Object doGetValue() { |
| try { |
| Method readMethod = propertyDescriptor.getReadMethod(); |
| if (readMethod == null) { |
| throw new BindingException(propertyDescriptor.getName() |
| + " property does not have a read method."); //$NON-NLS-1$ |
| } |
| if (!readMethod.isAccessible()) { |
| readMethod.setAccessible(true); |
| } |
| return readMethod.invoke(object, null); |
| } catch (InvocationTargetException e) { |
| /* |
| * InvocationTargetException wraps any exception thrown by the |
| * invoked method. |
| */ |
| throw new RuntimeException(e.getCause()); |
| } catch (Exception e) { |
| if (BeansObservables.DEBUG) { |
| Policy |
| .getLog() |
| .log( |
| new Status( |
| IStatus.WARNING, |
| Policy.JFACE_DATABINDING, |
| IStatus.OK, |
| "Could not read value of " + object + "." + propertyDescriptor.getName(), e)); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| return null; |
| } |
| } |
| |
| protected void lastListenerRemoved() { |
| unhookListener(); |
| } |
| |
| private void unhookListener() { |
| if (listenerSupport != null) { |
| listenerSupport.dispose(); |
| listenerSupport = null; |
| } |
| } |
| |
| public Object getValueType() { |
| return propertyDescriptor.getPropertyType(); |
| } |
| |
| public Object getObserved() { |
| return object; |
| } |
| |
| public PropertyDescriptor getPropertyDescriptor() { |
| return propertyDescriptor; |
| } |
| |
| public synchronized void dispose() { |
| unhookListener(); |
| super.dispose(); |
| } |
| } |