/*******************************************************************************
 * Copyright (c) 2000, 2015 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.about;

import org.eclipse.osgi.util.NLS;

import org.eclipse.core.runtime.IProduct;
import org.eclipse.core.runtime.Platform;

import org.eclipse.jface.action.Action;

import org.eclipse.ui.IWorkbenchCommandConstants;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
import org.eclipse.ui.internal.WorkbenchMessages;
import org.eclipse.ui.internal.dialogs.AboutDialog;

/**
 * Creates an About dialog and opens it.
 */
public class AboutAction extends Action implements
        ActionFactory.IWorkbenchAction {

    /**
     * The workbench window; or <code>null</code> if this action has been
     * <code>dispose</code>d.
     */
    private IWorkbenchWindow workbenchWindow;

    /**
     * Creates a new <code>AboutAction</code>.
     *
     * @param window the window
     */
    public AboutAction(IWorkbenchWindow window) {
        if (window == null) {
			throw new IllegalArgumentException();
		}

        this.workbenchWindow = window;

        // use message with no fill-in
        IProduct product = Platform.getProduct();
        String productName = null;
        if (product != null) {
			productName = product.getName();
		}
        if (productName == null) {
			productName = ""; //$NON-NLS-1$
		}
        setText(NLS.bind(WorkbenchMessages.AboutAction_text,productName));
        setToolTipText(NLS.bind(WorkbenchMessages.AboutAction_toolTip, productName));
        setId("about"); //$NON-NLS-1$
		setActionDefinitionId(IWorkbenchCommandConstants.HELP_ABOUT);
        window.getWorkbench().getHelpSystem().setHelp(this,
				IWorkbenchHelpContextIds.ABOUT_ACTION);
    }

    @Override
	public void run() {
        // make sure action is not disposed
        if (workbenchWindow != null) {
			new AboutDialog(workbenchWindow.getShell()).open();
		}
    }

    @Override
	public void dispose() {
        workbenchWindow = null;
    }
}