core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/util/SelectionUtil.java

/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.util;

import java.util.List;

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 s the selection
	 * @return the selected first element or null
	 *
	 */
	public static Object getSingleElement(ISelection s) {
		if (!(s instanceof IStructuredSelection))
			return null;
		IStructuredSelection selection= (IStructuredSelection)s;
		if (selection.size() != 1)
			return null;
	
		return selection.getFirstElement();		
	}
}