| /******************************************************************************* |
| * Copyright (c) 2010, 2014 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.commands; |
| |
| import java.util.Collections; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.e4.core.contexts.IContextFunction; |
| import org.eclipse.e4.core.contexts.IEclipseContext; |
| |
| /** |
| * @noreference |
| * @since 1.0 |
| */ |
| public class ExpressionContext implements IEvaluationContext { |
| /** |
| * See org.eclipse.e4.ui.services.IServiceConstants.ACTIVE_SELECTION |
| */ |
| private static final String ORG_ECLIPSE_UI_SELECTION = "org.eclipse.ui.selection"; //$NON-NLS-1$ |
| |
| public static final String ALLOW_ACTIVATION = "org.eclipse.e4.core.commands.ExpressionContext.allowActivation"; //$NON-NLS-1$ |
| |
| public IEclipseContext eclipseContext; |
| public static IContextFunction defaultVariableConverter = null; |
| |
| public ExpressionContext(IEclipseContext eclipseContext) { |
| this.eclipseContext = eclipseContext; |
| } |
| |
| @Override |
| public IEvaluationContext getParent() { |
| IEclipseContext parent = eclipseContext.getParent(); |
| return parent == null ? null : new ExpressionContext(parent); |
| } |
| |
| @Override |
| public IEvaluationContext getRoot() { |
| IEclipseContext current = eclipseContext; |
| IEclipseContext parent = current.getParent(); |
| while (parent != null) { |
| current = parent; |
| parent = current.getParent(); |
| } |
| if (current == eclipseContext) { |
| return this; |
| } |
| return new ExpressionContext(current); |
| } |
| |
| @Override |
| public void setAllowPluginActivation(boolean value) { |
| eclipseContext.set(ALLOW_ACTIVATION, Boolean.valueOf(value)); |
| } |
| |
| @Override |
| public boolean getAllowPluginActivation() { |
| Object obj = eclipseContext.get(ALLOW_ACTIVATION); |
| return obj instanceof Boolean ? ((Boolean) obj).booleanValue() : false; |
| } |
| |
| @Override |
| public Object getDefaultVariable() { |
| final Object sel; |
| if (defaultVariableConverter != null) { |
| sel = defaultVariableConverter.compute(eclipseContext, null); |
| } else { |
| sel = eclipseContext.getActive(ORG_ECLIPSE_UI_SELECTION); |
| } |
| return sel == null ? Collections.EMPTY_LIST : sel; |
| } |
| |
| @Override |
| public void addVariable(String name, Object value) { |
| eclipseContext.set(name, value); |
| } |
| |
| @Override |
| public Object removeVariable(String name) { |
| Object obj = eclipseContext.getLocal(name); |
| eclipseContext.remove(name); |
| return obj; |
| } |
| |
| @Override |
| public Object getVariable(String name) { |
| if (IEclipseContext.class.getName().equals(name)) { |
| return eclipseContext; |
| } |
| Object obj = eclipseContext.getActive(name); |
| return obj == null ? IEvaluationContext.UNDEFINED_VARIABLE : obj; |
| } |
| |
| @Override |
| public Object resolveVariable(String name, Object[] args) throws CoreException { |
| // TODO Auto-generated method stub |
| return null; |
| } |
| } |