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 }