/*
 * Copyright (c) 2007, 2012 Borland Software 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:
 *    Dmitry Stadnik (Borland) - initial API and implementation
 *    Michael Golubev (Montages) - API extracted to gmf.tooling.runtime (#372479)
 */
package org.eclipse.gmf.tooling.runtime.update;

import java.util.Iterator;
import java.util.List;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.core.commands.IHandlerListener;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.CanonicalEditPolicy;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.PlatformUI;

/**
 * @since 3.0
 */
public class UpdateDiagramCommand implements IHandler {

	public void addHandlerListener(IHandlerListener handlerListener) {
		//
	}

	public void removeHandlerListener(IHandlerListener handlerListener) {
		//
	}

	public void dispose() {
		//
	}

	public Object execute(ExecutionEvent event) throws ExecutionException {
		ISelection selection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().getSelection();
		if (selection instanceof IStructuredSelection) {
			IStructuredSelection structuredSelection = (IStructuredSelection) selection;
			if (structuredSelection.size() != 1) {
				return null;
			}
			if (structuredSelection.getFirstElement() instanceof EditPart && ((EditPart) structuredSelection.getFirstElement()).getModel() instanceof View) {
				EObject modelElement = ((View) ((EditPart) structuredSelection.getFirstElement()).getModel()).getElement();
				List<?> editPolicies = CanonicalEditPolicy.getRegisteredEditPolicies(modelElement);
				for (Iterator<?> it = editPolicies.iterator(); it.hasNext();) {
					CanonicalEditPolicy nextEditPolicy = (CanonicalEditPolicy) it.next();
					nextEditPolicy.refresh();
				}

			}
		}
		return null;
	}

	public boolean isEnabled() {
		return true;
	}

	public boolean isHandled() {
		return true;
	}

}