/*********************************************************************
* Copyright (c) 2005, 2019 SAP SE
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
*    SAP SE - initial API, implementation and documentation
*
* SPDX-License-Identifier: EPL-2.0
**********************************************************************/
package org.eclipse.graphiti.examples.common;

import java.net.URL;

import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.Platform;
import org.eclipse.graphiti.examples.common.outline.ContentOutlinePageAdapterFactory;
import org.eclipse.graphiti.ui.editor.IDiagramContainerUI;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

public class ExamplesCommonPlugin extends AbstractUIPlugin {

	private static ExamplesCommonPlugin _plugin;


	/**
	 * Creates the Plugin and caches its default instance.
	 */
	public ExamplesCommonPlugin() {
		_plugin = this;
	}

	// ============ overwritten methods of AbstractUIPlugin ====================

	/**
	 * This method is called upon plug-in activation.
	 * 
	 * @param context
	 *            the context
	 * 
	 * @throws Exception
	 *             the exception
	 */
	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);

		IAdapterManager manager = Platform.getAdapterManager();
		manager.registerAdapters(new ContentOutlinePageAdapterFactory(), IDiagramContainerUI.class);
		// TODO check if replacement above is ok
	}

	// ======================== static access methods ==========================

	/**
	 * Gets the default-instance of this plugin. Actually the default-instance
	 * should always be the only instance -> Singleton.
	 * 
	 * @return the default
	 */
	public static ExamplesCommonPlugin getDefault() {
		return _plugin;
	}

	// =========================== public helper methods ======================

	/**
	 * Returns the current Workspace.
	 * 
	 * @return The current Workspace.
	 */
	public static IWorkspace getWorkspace() {
		return ResourcesPlugin.getWorkspace();
	}

	/**
	 * Returns the URL, which points to where this Plugin is installed.
	 * 
	 * @return The URL, which points to where this Plugin is installed.
	 */
	public static URL getInstallURL() {
		return getDefault().getBundle().getEntry("/"); //$NON-NLS-1$
	}

	/**
	 * Returns the Plugin-ID.
	 * 
	 * @return The Plugin-ID.
	 */
	public static String getID() {
		return getDefault().getBundle().getSymbolicName();
	}

	/**
	 * Returns the currently active WorkbenchPage.
	 * 
	 * @return The currently active WorkbenchPage.
	 */
	public static IWorkbenchPage getActivePage() {
		IWorkbenchWindow workbenchWindow = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
		if (workbenchWindow != null)
			return workbenchWindow.getActivePage();
		return null;
	}

	/**
	 * Returns the currently active Shell.
	 * 
	 * @return The currently active Shell.
	 */
	public static Shell getShell() {
		return getDefault().getWorkbench().getActiveWorkbenchWindow().getShell();
	}
}