1 /*
   2  * Copyright (c) 2014, 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  */
  32 public class EqualsHashCodeSymmetryTest {
  33 
  34     private static final DataFlavor[] dataFlavors = {
  35             DataFlavor.stringFlavor,
  36             DataFlavor.imageFlavor,
  37             DataFlavor.javaFileListFlavor,
  38             DataFlavor.allHtmlFlavor,
  39             DataFlavor.selectionHtmlFlavor,
  40             DataFlavor.fragmentHtmlFlavor,
  41             createFlavor("text/html; class=java.lang.String"),
  42             new DataFlavor(String.class, "My test flavor number 1"),
  43             new DataFlavor(String.class, "My test flavor number 2"),
  44             new DataFlavor(StringBuilder.class, "My test flavor number 1")
  45     };
  46 
  47     public static void main(String[] args) {
  48         testEqualsSymmetry();
  49         testEqualsHashCodeConsistency();
  50         testSimpleCollision();
  51     }
  52 
  53     private static void testEqualsSymmetry() {
  54         for (DataFlavor flavor1 : dataFlavors) {
  55             for (DataFlavor flavor2 : dataFlavors) {
  56                 if (flavor1.equals(flavor2) != flavor2.equals(flavor1)) {
  57                     throw new RuntimeException(
  58                             String.format("Equals is not symmetric for %s and %s", flavor1, flavor2));
  59                 }
  60             }
  61         }
  62     }
  63 
  64     private static void testEqualsHashCodeConsistency() {
  65         for (DataFlavor flavor1 : dataFlavors) {
  66             for (DataFlavor flavor2 : dataFlavors) {
  67                 if ((flavor1.equals(flavor2) && flavor1.hashCode() != flavor2.hashCode())) {
  68                     throw new RuntimeException(
  69                             String.format("Equals and hash code not consistent for %s and %s", flavor1, flavor2));
  70                 }
  71             }
  72         }
  73     }
  74 
  75     private static void testSimpleCollision() {
  76         if (createFlavor("text/html; class=java.lang.String").hashCode() == DataFlavor.allHtmlFlavor.hashCode()) {
  77             throw new RuntimeException("HashCode collision because the document parameter is not used");
  78         }
  79     }
  80 
  81     private static DataFlavor createFlavor(String mime) {
  82         try {
  83             return new DataFlavor(mime);
  84         } catch (ClassNotFoundException e) {
  85             throw new RuntimeException(e);
  86         }
  87     }
  88 }