Bug 465416: Synchronization of diagrams with other diagrams

https://bugs.eclipse.org/bugs/show_bug.cgi?id=465416

Fix some deletion scenarios in diagram-to-diagram synchronization (as in
UML-RT capsule inherited state machines).

1 files changed, 84 insertions, 0 deletions

diff --git a/tests/junit/plugins/junit/org.eclipse.papyrus.junit.utils/src/org/eclipse/papyrus/junit/utils/resources/ChangeCapture.java b/tests/junit/plugins/junit/org.eclipse.papyrus.junit.utils/src/org/eclipse/papyrus/junit/utils/resources/ChangeCapture.java
new file mode 100644
index 00000000000..c8d99f3f537
--- /dev/null
+++ b/tests/junit/plugins/junit/org.eclipse.papyrus.junit.utils/src/org/eclipse/papyrus/junit/utils/resources/ChangeCapture.java
@@ -0,0 +1,84 @@
+/*****************************************************************************
+ * 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 v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * 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;
+		}
+	}
+
+}