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/*****************************************************************************
* Copyright (c) 2015 Christian W. Damus and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.junit.utils.resources;
import org.eclipse.emf.ecore.change.ChangeDescription;
import org.eclipse.emf.transaction.NotificationFilter;
import org.eclipse.emf.transaction.ResourceSetChangeEvent;
import org.eclipse.emf.transaction.ResourceSetListenerImpl;
import org.eclipse.emf.transaction.Transaction;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
/**
* A listener that captures the {@link ChangeDescription}s of EMF {@link Transaction}s.
* it is {@link AutoCloseable} for convenience of ensuring that it is removed from the editing domain
* when no longer needed.
*
* @see #getChangeDescription()
*/
public class ChangeCapture extends ResourceSetListenerImpl implements AutoCloseable {
private TransactionalEditingDomain domain;
private ChangeDescription changeDescription;
/**
* Initializes me with my editing {@code domain}, to which I immediately begin listening for transactions
* (there is no need to add me as a listener explicitly). I only capture the changes of a transaction
* that actually makes non-read-only-compatible changes.
*
* @param domain
* my editing domain
*/
public ChangeCapture(TransactionalEditingDomain domain) {
super(NotificationFilter.NOT_TOUCH);
this.domain = domain;
domain.addResourceSetListener(this);
}
@Override
public boolean isPostcommitOnly() {
return true;
}
@Override
public void resourceSetChanged(ResourceSetChangeEvent event) {
// Ignore unbatched (non-transactional) changes
if (event.getTransaction() != null) {
this.changeDescription = event.getTransaction().getChangeDescription();
}
}
/**
* Obtains the change description of the last committed transaction, if any.
*
* @return the last transaction's changes, or {@code null} if none
*/
public ChangeDescription getChangeDescription() {
return changeDescription;
}
/**
* Detaches me from my editing domain.
*/
@Override
public void close() {
if (domain != null) {
domain.removeResourceSetListener(this);
domain = null;
}
}
}
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