/*******************************************************************************
* Copyright (c) 2006, 2016 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
* 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() {
}
}