Bug 219909 [DataBinding] UnmodifiableObservableValue
UnmodifiableObservableValue with test cases
bundles/org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Observables.java
/*******************************************************************************
 * Copyright (c) 2006-2008 Cerner Corporation 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:
 *     Brad Reynolds - initial API and implementation
 *     Matthew Hall - bug 208332
 *     Matt Carter - bug 212518 (constantObservableValue)
 *     Matthew Hall - bug 212518
 ******************************************************************************/
package org.eclipse.core.databinding.observable;