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