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/*******************************************************************************
* Copyright (c) 2010, 2012 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility;
/**
* Provide a container for holding an object that cannot be changed.
*
* @see ModifiableObjectReference
*/
public interface ObjectReference<V> {
/**
* Return the current value.
*/
V getValue();
/**
* Return whether the current value is equal to the specified value.
*/
boolean valueEquals(Object object);
/**
* Return whether the current value is not equal to the specified value.
*/
boolean valueNotEqual(Object object);
/**
* Return whether the current value is <code>null</code>.
*/
boolean isNull();
/**
* Return whether the current value is not <code>null</code>.
*/
boolean isNotNull();
}
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