OpenHelpHandler.java

/**
 * Copyright (c) 2016 Codetrails GmbH.
 * 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:
 *    Johannes Dorn - initial API and implementation.
 */
package org.eclipse.recommenders.internal.utils.rcp.help;

import static org.eclipse.recommenders.utils.rcp.preferences.AbstractLinkContributionPage.COMMAND_HREF_ID;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.help.IWorkbenchHelpSystem;

public class OpenHelpHandler extends AbstractHandler {

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        IWorkbenchHelpSystem helpSystem = PlatformUI.getWorkbench().getHelpSystem();
        String href = event.getParameter(COMMAND_HREF_ID);

        if (href != null) {
            helpSystem.displayHelpResource(href);
        } else {
            helpSystem.displayHelp();
        }

        return null;
    }
}