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/*
* Copyright (c) 2012 Eike Stepper (Berlin, Germany) 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:
* Martin Fluegge - initial API and implementation
*/
package org.eclipse.emf.cdo.transaction;
import org.eclipse.emf.cdo.CDONotification;
import org.eclipse.emf.cdo.CDOObject;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
import org.eclipse.emf.cdo.util.CDOUtil;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EObject;
/**
* An abstract call-back class that is called by a {@link CDOTransaction transcation} after {@link CDOObject objects} have been
* attached, modified or detached.
*
* @see CDOTransactionHandler1
* @author Martin Fluegge
* @since 4.1
*/
public abstract class CDOPostEventTransactionHandler implements CDOTransactionHandler
{
private final Adapter ATTACHED_ADAPTER = new PostEventAdapter()
{
@Override
protected void postEvent(CDOTransaction transaction, CDOObject object, Notification msg)
{
attachedObject(transaction, object, msg);
}
};
private final Adapter MODIFIED_ADAPTER = new PostEventAdapter()
{
@Override
protected void postEvent(CDOTransaction transaction, CDOObject object, Notification msg)
{
modifiedObject(transaction, object, msg);
}
};
private final Adapter DEATTACHED_ADAPTER = new PostEventAdapter()
{
@Override
protected void postEvent(CDOTransaction transaction, CDOObject object, Notification msg)
{
detachedObject(transaction, object, msg);
}
};
public CDOPostEventTransactionHandler()
{
}
public void attachingObject(CDOTransaction transaction, CDOObject object)
{
object.eAdapters().add(ATTACHED_ADAPTER);
}
public void modifyingObject(CDOTransaction transaction, CDOObject object, CDOFeatureDelta featureDelta)
{
object.eAdapters().add(MODIFIED_ADAPTER);
}
public void detachingObject(CDOTransaction transaction, CDOObject object)
{
object.eAdapters().add(DEATTACHED_ADAPTER);
}
public void committingTransaction(CDOTransaction transaction, CDOCommitContext commitContext)
{
}
public void committedTransaction(CDOTransaction transaction, CDOCommitContext commitContext)
{
}
public void rolledBackTransaction(CDOTransaction transaction)
{
}
protected abstract void attachedObject(CDOTransaction transaction, CDOObject object, Notification msg);
protected abstract void modifiedObject(CDOTransaction transaction, CDOObject object, Notification msg);
protected abstract void detachedObject(CDOTransaction transaction, CDOObject object, Notification msg);
/**
* An empty default implementation of {@link CDOPostEventTransactionHandler}.
*
* @author Eike Stepper
*/
public static class Default extends CDOPostEventTransactionHandler
{
@Override
protected void attachedObject(CDOTransaction transaction, CDOObject object, Notification msg)
{
}
@Override
protected void modifiedObject(CDOTransaction transaction, CDOObject object, Notification msg)
{
}
@Override
protected void detachedObject(CDOTransaction transaction, CDOObject object, Notification msg)
{
}
}
/**
* @author Martin Fluegge
*/
private static abstract class PostEventAdapter extends AdapterImpl
{
@Override
public void notifyChanged(Notification msg)
{
if (msg instanceof CDONotification)
{
return;
}
if (isModifyingEvent(msg.getEventType()))
{
Object notifier = msg.getNotifier();
if (notifier instanceof EObject)
{
CDOObject object = CDOUtil.getCDOObject((EObject)notifier);
// Avoid duplicate notifications
EList<Adapter> adapters = object.eAdapters();
if (adapters.contains(this))
{
postEvent((CDOTransaction)object.cdoView(), object, msg);
boolean deliver = object.eDeliver();
try
{
if (deliver)
{
object.eSetDeliver(false);
}
adapters.remove(this);
}
finally
{
if (deliver)
{
object.eSetDeliver(true);
}
}
}
}
}
}
protected abstract void postEvent(CDOTransaction transaction, CDOObject object, Notification msg);
private static boolean isModifyingEvent(int eventType)
{
switch (eventType)
{
case Notification.ADD:
case Notification.ADD_MANY:
case Notification.MOVE:
case Notification.REMOVE:
case Notification.REMOVE_MANY:
case Notification.SET:
case Notification.UNSET:
return true;
default:
return false;
}
}
}
}
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