| /******************************************************************************* |
| * Copyright (c) 2006, 2016 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 |
| * Martin Oberhuber (Wind River) Bug 354428 |
| *******************************************************************************/ |
| package org.eclipse.help.ui.internal; |
| |
| import org.eclipse.core.expressions.EvaluationContext; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.ui.PlatformUI; |
| |
| /* |
| * Supplies en evaluation context for filtering help documents when running in |
| * workbench mode. This is used for resolving variables in enablement expressions. |
| */ |
| public final class HelpUIEvaluationContext { |
| |
| private static final String VARIABLE_PLATFORM = "platform"; //$NON-NLS-1$ |
| private static final String VARIABLE_WORKBENCH = "workbench"; //$NON-NLS-1$ |
| |
| private static EvaluationContext context; |
| |
| /* |
| * Returns the evaluation context to use in help documents. |
| */ |
| public static EvaluationContext getContext() { |
| if (context == null) { |
| context = new EvaluationContext(null, Platform.class) { |
| |
| @Override |
| public Object getVariable(String name) { |
| if (VARIABLE_PLATFORM.equals(name)) { |
| return Platform.class; |
| } |
| else if (VARIABLE_WORKBENCH.equals(name)) { |
| return PlatformUI.getWorkbench(); |
| } |
| return null; |
| } |
| }; |
| context.setAllowPluginActivation(true); |
| } |
| return context; |
| } |
| |
| /* |
| * Not meant to be instantiated. |
| */ |
| private HelpUIEvaluationContext() { |
| } |
| } |