1 /* 2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.awt.datatransfer.DataFlavor; 25 26 /** 27 * @test 28 * @bug 8038999 29 * @summary DataFlavor.equals is not symmetric 30 * @author Petr Pchelko <petr.pchelko@oracle.com> 31 * @modules java.datatransfer 32 */ 33 public class EqualsHashCodeSymmetryTest { 34 35 private static final DataFlavor[] dataFlavors = { 36 DataFlavor.stringFlavor, 37 DataFlavor.imageFlavor, 38 DataFlavor.javaFileListFlavor, 39 DataFlavor.allHtmlFlavor, 40 DataFlavor.selectionHtmlFlavor, 41 DataFlavor.fragmentHtmlFlavor, 42 createFlavor("text/html; class=java.lang.String"), 43 new DataFlavor(String.class, "My test flavor number 1"), 44 new DataFlavor(String.class, "My test flavor number 2"), 45 new DataFlavor(StringBuilder.class, "My test flavor number 1") 46 }; 47 48 public static void main(String[] args) { 49 testEqualsSymmetry(); 50 testEqualsHashCodeConsistency(); 51 testSimpleCollision(); 52 } 53 54 private static void testEqualsSymmetry() { 55 for (DataFlavor flavor1 : dataFlavors) { 56 for (DataFlavor flavor2 : dataFlavors) { 57 if (flavor1.equals(flavor2) != flavor2.equals(flavor1)) { 58 throw new RuntimeException( 59 String.format("Equals is not symmetric for %s and %s", flavor1, flavor2)); 60 } 61 } 62 } 63 } 64 65 private static void testEqualsHashCodeConsistency() { 66 for (DataFlavor flavor1 : dataFlavors) { 67 for (DataFlavor flavor2 : dataFlavors) { 68 if ((flavor1.equals(flavor2) && flavor1.hashCode() != flavor2.hashCode())) { 69 throw new RuntimeException( 70 String.format("Equals and hash code not consistent for %s and %s", flavor1, flavor2)); 71 } 72 } 73 } 74 } 75 76 private static void testSimpleCollision() { 77 if (createFlavor("text/html; class=java.lang.String").hashCode() == DataFlavor.allHtmlFlavor.hashCode()) { 78 throw new RuntimeException("HashCode collision because the document parameter is not used"); 79 } 80 } 81 82 private static DataFlavor createFlavor(String mime) { 83 try { 84 return new DataFlavor(mime); 85 } catch (ClassNotFoundException e) { 86 throw new RuntimeException(e); 87 } 88 } 89 }