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diff --git a/compare/bundles/org.eclipse.papyrus.compare.diagram/src/org/eclipse/papyrus/compare/diagram/internal/AbstractPapyrusDiagramDiffHandler.java b/compare/bundles/org.eclipse.papyrus.compare.diagram/src/org/eclipse/papyrus/compare/diagram/internal/AbstractPapyrusDiagramDiffHandler.java
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+++ b/compare/bundles/org.eclipse.papyrus.compare.diagram/src/org/eclipse/papyrus/compare/diagram/internal/AbstractPapyrusDiagramDiffHandler.java
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+/*******************************************************************************
+ * Copyright (c) 2015 Obeo.
+ * 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:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.papyrus.compare.diagram.internal;
+
+import org.eclipse.emf.compare.Diff;
+import org.eclipse.emf.compare.Match;
+import org.eclipse.emf.compare.ReferenceChange;
+import org.eclipse.emf.compare.utils.MatchUtil;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.gmf.runtime.notation.Connector;
+import org.eclipse.gmf.runtime.notation.NotationPackage;
+import org.eclipse.uml2.uml.Property;
+import org.eclipse.uml2.uml.Transition;
+import org.eclipse.uml2.uml.UMLPackage;
+
+/**
+ * Super-class of handlers of this project to mutualize some code.
+ * 
+ * @author <a href="mailto:laurent.delaigue@obeo.fr">Laurent Delaigue</a>
+ */
+public abstract class AbstractPapyrusDiagramDiffHandler implements IDiffHandler {
+
+	/**
+	 * Indicates whether the given {@link Diff} is a change of the reference <code>uml::Property.type</code>.
+	 * 
+	 * @param diff
+	 *            The diff
+	 * @return <code>true</code> if and only if the given diff is a {@link ReferenceChange} that concerns the
+	 *         <code>uml::TypedElement.type</code> reference, on an Property
+	 */
+	protected boolean isPropertyTypeChange(ReferenceChange diff) {
+		EReference ref = diff.getReference();
+		return ref == UMLPackage.Literals.TYPED_ELEMENT__TYPE
+				&& getOriginMatchObject(diff) instanceof Property;
+	}
+
+	/**
+	 * Indicates whether the given {@link ReferenceChange} is a change of the "source" or "target" EReference
+	 * of a uml::Transition.
+	 * 
+	 * @param diff
+	 *            The diff
+	 * @return <code>true</code> if and only if the change is that of a Transition's target or source
+	 *         reference.
+	 */
+	protected boolean isTransitionReferenceChange(ReferenceChange diff) {
+		EReference ref = diff.getReference();
+		return (ref == UMLPackage.Literals.TRANSITION__TARGET
+				|| ref == UMLPackage.Literals.TRANSITION__SOURCE)
+				&& getOriginMatchObject(diff) instanceof Transition;
+	}
+
+	/**
+	 * Indicates whether the given {@link ReferenceChange} is a change of the "source" or "target" EReference
+	 * of a notation::Connector.
+	 * 
+	 * @param diff
+	 *            the ref change
+	 * @return <code>true</code> if and only if the change is that of a Connector'target or source reference.
+	 */
+	protected boolean isConnectorReferenceChange(ReferenceChange diff) {
+		EReference ref = diff.getReference();
+		return (ref == NotationPackage.Literals.EDGE__TARGET || ref == NotationPackage.Literals.EDGE__SOURCE)
+				&& getOriginMatchObject(diff) instanceof Connector;
+	}
+
+	/**
+	 * Indicates whether the given {@link ReferenceChange} is a part of a more global ADD or DELETE change.
+	 * 
+	 * @param refChange
+	 *            The ref change
+	 * @return <code>true</code> if and only if the given change is part of an ADD or DELETE.
+	 */
+	protected boolean isContainedInAddOrDelete(ReferenceChange refChange) {
+		EObject eContainer = refChange.getMatch().eContainer();
+		if (eContainer instanceof Match) {
+			if (MatchUtil.getOriginValue(refChange.getMatch().getComparison(), refChange) == null) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Provides the EObject of the given diff's match that is on the "origin" side, which is LEFT for 2-way
+	 * and ORIGIN for 3-way.
+	 * 
+	 * @param diff
+	 *            The diff
+	 * @return The EObject of the diff's match that is on the LEFT if the diff's comparison is 2-way, and on
+	 *         the ORIGIN side if the diff's comparison is 3-way.
+	 */
+	protected EObject getOriginMatchObject(Diff diff) {
+		Match match = diff.getMatch();
+		final EObject result;
+		if (match == null) {
+			result = null; // diff is a ResourceLocationChange, for instance
+		} else {
+			if (match.getOrigin() != null) {
+				result = match.getOrigin();
+			} else {
+				result = match.getLeft();
+			}
+		}
+		return result;
+	}
+
+}