/*******************************************************************************
 * Copyright (c) 2000, 2004 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.erlide.ui.internal.util;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;

public class SelectionUtil {

	// public static List toList(ISelection selection) {
	// if (selection instanceof IStructuredSelection) {
	// return ((IStructuredSelection) selection).toList();
	// }
	// return null;
	// }

	/**
	 * Returns the selected element if the selection consists of a single
	 * element only.
	 * 
	 * @param selection
	 *            the selection
	 * @return the selected first element or null
	 * 
	 */
	public static Object getSingleElement(final ISelection s) {
		if (!(s instanceof IStructuredSelection)) {
			return null;
		}
		final IStructuredSelection selection = (IStructuredSelection) s;
		if (selection.size() != 1) {
			return null;
		}

		return selection.getFirstElement();
	}
}
