| /******************************************************************************* |
| * Copyright (c) 2009, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.e4.core.contexts; |
| |
| /** |
| * The base class for all computed value implementations. Clients may subclass |
| * this class. See the class comment of {@link IContextFunction} for specific |
| * rules that must be followed by function implementations. |
| * <p> |
| * This class is intended to be subclassed by clients. |
| * </p> |
| * @see IContextFunction |
| * @since 1.3 |
| */ |
| public abstract class ContextFunction implements IContextFunction { |
| |
| /** |
| * Constructs a new instance of the context function |
| */ |
| public ContextFunction() { |
| // placeholder |
| } |
| |
| /** |
| * @deprecated {@link IContextFunction}'s compute() was changed to take the context key |
| */ |
| public Object compute(IEclipseContext context) { |
| return null; |
| } |
| |
| @Override |
| public Object compute(IEclipseContext context, String contextKey) { |
| // call into now-deprecated method to maintain backwards compatibility |
| return compute(context); |
| } |
| |
| } |
