examples/org.eclipse.e4.ui.deeplink.skeleton/src/org/eclipse/e4/ui/app/skeleton/ApplicationWorkbenchAdvisor.java

/******************************************************************************
 * Copyright (c) David Orme 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:
 *    David Orme - initial API and implementation
 ******************************************************************************/
package org.eclipse.e4.ui.app.skeleton;

import org.eclipse.e4.core.metaconfig.Configuration;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.application.IWorkbenchConfigurer;
import org.eclipse.ui.application.IWorkbenchWindowConfigurer;
import org.eclipse.ui.application.WorkbenchAdvisor;
import org.eclipse.ui.application.WorkbenchWindowAdvisor;


/**
 * class WorkbenchAdvisor.  This is a standard Eclipse workbench advisor with
 * the addition that it looks up the default perspective ID in the configuration
 * file.
 */
public class ApplicationWorkbenchAdvisor extends WorkbenchAdvisor {

    /**
     * The key to look for in the configuration file identifying the default perspective
     */
    private static final String DEFAULT_PERSPECTIVE_ID_KEY = "org.eclipse.e4.DEFAULT_PERSPECTIVE_ID";

	public WorkbenchWindowAdvisor createWorkbenchWindowAdvisor(IWorkbenchWindowConfigurer configurer) {
        return new ApplicationWorkbenchWindowAdvisor(configurer);
    }

	public void initialize(IWorkbenchConfigurer configurer) {
		super.initialize(configurer);
		configurer.setSaveAndRestore(true);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.application.WorkbenchAdvisor#getInitialWindowPerspectiveId()
	 */
	public String getInitialWindowPerspectiveId() {
		/*
		 * Query the configuration for the default perspective ID and try that first.
		 * Else return some hard-coded perspective ID.  Eclipse won't load any
		 * perspective if it can't find this one.
		 */
		Configuration config = Activator.getDefault().getConfiguration();
		String defaultPerspectiveId = (String) config.getProperties().get(DEFAULT_PERSPECTIVE_ID_KEY);
		
		if (perspectiveExists(defaultPerspectiveId)) {
			return defaultPerspectiveId;
		} else {
			//null is fine to return here as Eclipse interprets this as not opening any perspective at all
			//If your code gets in here it is highly likely that you have either a) misspelled the ID of your perspective being downloaded
			//or b) the download failed and the perspective isn't available
			return null;
		}
	}

	private boolean perspectiveExists(String perspectiveId) {
		if (PlatformUI.getWorkbench().getPerspectiveRegistry().findPerspectiveWithId(perspectiveId) != null) {
			return true;
		} else {
			return false;
		}
	}
}