--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uidesigner/com.nokia.sdt.emf.dm/src/com/nokia/sdt/emf/dm/util/PropertyValueSwitch.java	Fri Apr 03 23:33:03 2009 +0100
@@ -0,0 +1,58 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+package com.nokia.sdt.emf.dm.util;
+
+import com.nokia.sdt.emf.dm.IPropertyValue;
+
+	/**
+	 * Utility for dispatching base on the runtime
+	 * type of a property value. Using this helps
+	 * with maintainance in the event new types are added.
+	 */
+public abstract class PropertyValueSwitch {
+	
+	protected abstract Object handleStringValue(IPropertyValue pv);
+	
+	protected abstract Object handleCompoundValue(IPropertyValue pv);
+	
+	protected abstract Object handleSequenceValue(IPropertyValue pv);
+	
+	protected Object handleNoValue(IPropertyValue pv) {
+		throw new IllegalStateException();
+	}
+
+	public Object doSwitch(IPropertyValue pv) {
+		Object result;
+		if (pv.hasStringValue()) {
+			result = handleStringValue(pv);
+		}
+		else if (pv.hasCompoundValue()) {
+			result = handleCompoundValue(pv);
+		}
+		else if (pv.hasSequenceValue()) {
+			result = handleSequenceValue(pv);
+		}
+		else if (pv.getValue() == null) {
+			result = handleNoValue(pv);
+		}
+		else {
+			// unhandle new property type
+			throw new IllegalStateException();
+		}
+		return result;
+	}
+}