1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.utils.datastructures;
14 import java.util.Collection;
15 import java.util.ConcurrentModificationException;
17 public class SelectionUtils {
19 public static <T> T getSingle(Collection<T> collection) {
20 if(collection.size() != 1)
21 throw new RuntimeException("Size of the collection is not one.");
22 for(T obj : collection)
24 throw new ConcurrentModificationException("collection was emptied before iteration");
27 public static <T> T getAtMostOne(Collection<T> collection) {
28 if(collection.size() > 1)
29 throw new RuntimeException("Size of the collection is greater than one.");
30 for(T obj : collection)