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/*******************************************************************************
* Copyright (c) 2006, 2008 IBM 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:
* IBM Corporation - initial API and implementation
* Matthew Hall - bug 237718
*******************************************************************************/
package org.eclipse.core.databinding.observable.value;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.Realm;
/**
* A value whose changes can be tracked by value change listeners.
*
* @noimplement This interface is not intended to be implemented by clients.
* Clients should instead subclass one of the classes that
* implement this interface. Note that direct implementers of this
* interface outside of the framework will be broken in future
* releases when methods are added to this interface.
*
* @see AbstractObservableValue
*
* @since 1.0
*/
public interface IObservableValue extends IObservable {
/**
* The value type of this observable value, or <code>null</code> if this
* observable value is untyped.
*
* @return the value type, or <code>null</null>
*/
public Object getValueType();
/**
* Returns the value. Must be invoked in the {@link Realm} of the observable.
*
* @return the current value
* @TrackedGetter
*/
public Object getValue();
/**
* Sets the value. Must be invoked in the {@link Realm} of the observable.
*
* @param value
* the value to set
* @throws UnsupportedOperationException
* if this observable value cannot be set.
*/
public void setValue(Object value);
/**
*
* @param listener
*/
public void addValueChangeListener(IValueChangeListener listener);
/**
* @param listener
*/
public void removeValueChangeListener(IValueChangeListener listener);
}
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