bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/menus/MenuServiceFactory.java

/*******************************************************************************
 * Copyright (c) 2008 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.ui.internal.menus;

import org.eclipse.core.expressions.Expression;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPartSite;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.internal.expressions.ActivePartExpression;
import org.eclipse.ui.internal.expressions.WorkbenchWindowExpression;
import org.eclipse.ui.menus.IMenuService;
import org.eclipse.ui.services.AbstractServiceFactory;
import org.eclipse.ui.services.IServiceLocator;

/**
 * @since 3.4
 * 
 */
public class MenuServiceFactory extends AbstractServiceFactory {

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.services.AbstractServiceFactory#create(java.lang.Class,
	 *      org.eclipse.ui.services.IServiceLocator,
	 *      org.eclipse.ui.services.IServiceLocator)
	 */
	public Object create(Class serviceInterface, IServiceLocator parentLocator,
			IServiceLocator locator) {
		if (!IMenuService.class.equals(serviceInterface)) {
			return null;
		}
		final IWorkbench wb = (IWorkbench) locator.getService(IWorkbench.class);
		if (wb == null) {
			return null;
		}

		Object parent = parentLocator.getService(serviceInterface);
		if (parent == null) {
			// we are registering the global services in the Workbench
			return null;
		}
		final IWorkbenchWindow window = (IWorkbenchWindow) locator
				.getService(IWorkbenchWindow.class);
		final IWorkbenchPartSite site = (IWorkbenchPartSite) locator
				.getService(IWorkbenchPartSite.class);
		if (site == null) {
			Expression exp = new WorkbenchWindowExpression(window);
			return new SlaveMenuService((InternalMenuService) parent, locator,
					exp);
		}

		Expression exp = new ActivePartExpression(site.getPart());
		return new SlaveMenuService((InternalMenuService) parent, locator, exp);
	}

}