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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14 * @Author Toni Kalajainen
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16 package org.simantics.utils;
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18 import java.util.Collection;
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19 import java.util.Iterator;
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22 * Basic utilities for any objects.
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24 public class ObjectUtils {
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27 * Compares two object for equality.
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29 * Some times it is annoying to compare two objects if their value may be
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34 * @return true if equal or both null
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36 public static boolean objectEquals(Object o1, Object o2) {
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39 if (o1 == null && o2 == null)
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41 if (o1 == null || o2 == null)
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43 return o1.equals(o2);
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46 public static int hashCode(Object obj) {
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47 return (obj == null ? 0 : obj.hashCode());
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50 public static boolean equals(Collection<?> c1, Collection<?> c2) {
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51 if (c1.size() != c2.size())
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53 Iterator<?> i1 = c1.iterator();
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54 Iterator<?> i2 = c2.iterator();
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55 while (i1.hasNext()) {
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56 if (!ObjectUtils.objectEquals(i1.next(), i2.next()))
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