/*
 *  Copyright (c) 2006, 2009 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:
 *      Borland Software Corporation - initial API and implementation
 */
package org.eclipse.gmf.graphdef.editor.part;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.operations.OperationHistoryFactory;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.common.util.WrappedException;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.graphdef.editor.edit.commands.GMFGraphCreateShortcutDecorationsCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.diagram.ui.commands.CreateCommand;
import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateViewRequest;
import org.eclipse.gmf.runtime.emf.core.util.EObjectAdapter;
import org.eclipse.gmf.runtime.notation.Node;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * @generated
 */
public class CreateShortcutAction extends AbstractHandler {

	/**
	 * @generated
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {
		IEditorPart diagramEditor = HandlerUtil.getActiveEditorChecked(event);
		Shell shell = diagramEditor.getEditorSite().getShell();
		assert diagramEditor instanceof DiagramEditor;
		TransactionalEditingDomain editingDomain = ((DiagramEditor) diagramEditor).getEditingDomain();
		ISelection selection = HandlerUtil.getCurrentSelectionChecked(event);
		assert selection instanceof IStructuredSelection;
		assert ((IStructuredSelection) selection).size() == 1;
		assert ((IStructuredSelection) selection).getFirstElement() instanceof EditPart;
		EditPart selectedDiagramPart = (EditPart) ((IStructuredSelection) selection).getFirstElement();
		final View view = (View) selectedDiagramPart.getModel();
		GMFGraphElementChooserDialog elementChooser = new GMFGraphElementChooserDialog(shell, view);
		int result = elementChooser.open();
		if (result != Window.OK) {
			return null;
		}
		URI selectedModelElementURI = elementChooser.getSelectedModelElementURI();
		final EObject selectedElement;
		try {
			selectedElement = editingDomain.getResourceSet().getEObject(selectedModelElementURI, true);
		} catch (WrappedException e) {
			GMFGraphDiagramEditorPlugin.getInstance().logError("Exception while loading object: " + selectedModelElementURI.toString(), e); //$NON-NLS-1$
			return null;
		}

		if (selectedElement == null) {
			return null;
		}
		CreateViewRequest.ViewDescriptor viewDescriptor = new CreateViewRequest.ViewDescriptor(new EObjectAdapter(selectedElement), Node.class, null,
				GMFGraphDiagramEditorPlugin.DIAGRAM_PREFERENCES_HINT);
		ICommand command = new CreateCommand(editingDomain, viewDescriptor, view);
		command = command.compose(new GMFGraphCreateShortcutDecorationsCommand(editingDomain, view, viewDescriptor));
		try {
			OperationHistoryFactory.getOperationHistory().execute(command, new NullProgressMonitor(), null);
		} catch (ExecutionException e) {
			GMFGraphDiagramEditorPlugin.getInstance().logError("Unable to create shortcut", e); //$NON-NLS-1$
		}
		return null;
	}

}