| /******************************************************************************* |
| * Copyright (c) 2005 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 |
| *******************************************************************************/ |
| package org.eclipse.jface.databinding; |
| |
| /** |
| * An updatable value wraps a single value that can be updated programmatically, |
| * and whose changes can be tracked by registering a change listener. |
| * |
| * <p> |
| * <strong>EXPERIMENTAL</strong>. This class or interface has been added as |
| * part of a work in progress. There is no guarantee that this API will remain |
| * unchanged during the 3.2 release cycle. Please do not use this API without |
| * consulting with the Platform/UI team. |
| * </p> |
| * |
| * @since 3.2 |
| */ |
| public interface IUpdatableValue extends IUpdatable { |
| |
| /** |
| * Sets the value of this updatable value to the given object, which must be |
| * an instance of the value type returned by getValueType(). If the value |
| * type is an object type, then the given value may be </code>null</code>. |
| * Change listeners will be notified of this change with the exception of |
| * the given listener. If the given listener is null, all listeners will be |
| * notified. |
| * |
| * TODO we probably need to be able to veto a change. Maybe returning a |
| * status? djo: if we do that, we will have to have a separate method |
| * for that (2-phase commit) or we will have to have a rollback method |
| * to handle the case where multiple updatables are listening and some have |
| * committed but one vetos the change. |
| * |
| * @param value |
| */ |
| public void setValue(Object value); |
| |
| /** |
| * Returns the current value, which must be an instance of the value type |
| * returned by getValueType(). If the value type is an object type, then the |
| * returned value may be </code>null</code>. |
| * |
| * @return the current value |
| */ |
| public Object getValue(); |
| |
| /** |
| * Returns the type of the values that this updatable value can hold. This |
| * method's return value does not change over time. |
| * |
| * @return the value type |
| */ |
| public Class getValueType(); |
| } |