Mercurial > projects > dwt2
view org.eclipse.core.databinding.beans/src/org/eclipse/core/internal/databinding/beans/JavaBeanObservableValue.d @ 96:b74ac5dfcc06
package to module and java.lang.all import
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:03:33 +0200 |
parents | 6208d4f6a277 |
children | c86eb8b3098e |
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/******************************************************************************* * 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 *******************************************************************************/ module org.eclipse.core.internal.databinding.beans.JavaBeanObservableValue; import java.lang.all; 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 : AbstractObservableValue , IBeanObservable { private final Object object; private bool updating = false; private final PropertyDescriptor propertyDescriptor; private ListenerSupport listenerSupport; private bool attachListeners; /** * @param realm * @param object * @param descriptor */ public this(Realm realm, Object object, PropertyDescriptor descriptor) { this(realm, object, descriptor, true); } /** * @param realm * @param object * @param descriptor * @param attachListeners */ public this(Realm realm, Object object, PropertyDescriptor descriptor, bool attachListeners) { super(realm); this.object = object; this.propertyDescriptor = descriptor; this.attachListeners = attachListeners; } protected void firstListenerAdded() { if (!attachListeners) { return; } PropertyChangeListener listener = new class() PropertyChangeListener { public void propertyChange(java.beans.PropertyChangeEvent event) { if (!updating) { final ValueDiff diff = Diffs.createValueDiff(event.getOldValue(), event.getNewValue()); getRealm().exec(new class() Runnable { public void run() { fireValueChange(diff); }}); } } }; if (listenerSupport is 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 cast(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 is 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 cast(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 !is 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(); } }