| /******************************************************************************* |
| * 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); |
| } |