J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* @test |
| 25 | * @bug 4140729 |
| 26 | * @summary Verify that writeReplace & readResolve are called by serialization. |
| 27 | * readResolve is used to maintain the invariant that the enums |
| 28 | * of TypeSafeEnum are singletons. |
| 29 | */ |
| 30 | import java.io.*; |
| 31 | |
| 32 | public class TypeSafeEnum implements Serializable, ObjectInputValidation { |
| 33 | private static int numWriteObject = 0; |
| 34 | private static int numReadObject = 0; |
| 35 | |
| 36 | |
| 37 | private String value; |
| 38 | private TypeSafeEnum(String value) { |
| 39 | this.value = value; |
| 40 | } |
| 41 | |
| 42 | final public static TypeSafeEnum FIRST = new TypeSafeEnum("First"); |
| 43 | final public static TypeSafeEnum SECOND = new TypeSafeEnum("Second"); |
| 44 | final public static TypeSafeEnum THIRD = new TypeSafeEnum("Third"); |
| 45 | static int numReadResolve = 0; |
| 46 | static int numWriteReplace = 0; |
| 47 | static boolean verbose = false; |
| 48 | |
| 49 | |
| 50 | private Object writeReplace() throws IOException { |
| 51 | numWriteReplace++; |
| 52 | if (verbose) { |
| 53 | System.out.println("TypeSafeEnum.writeReplace() " + |
| 54 | this.toString()); |
| 55 | } |
| 56 | return this; |
| 57 | } |
| 58 | |
| 59 | private Object readResolve() throws IOException { |
| 60 | numReadResolve++; |
| 61 | if (verbose) { |
| 62 | System.out.println("readResolve called on " + this.toString()); |
| 63 | } |
| 64 | if (value.equals(FIRST.value)) { |
| 65 | return FIRST; |
| 66 | } else if (value.equals(SECOND.value)) { |
| 67 | return SECOND; |
| 68 | } else if (value.equals(THIRD.value)) { |
| 69 | return THIRD; |
| 70 | } else { |
| 71 | //unknown type safe enum |
| 72 | return this; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | private void readObject(ObjectInputStream in) |
| 77 | throws IOException, ClassNotFoundException |
| 78 | { |
| 79 | numReadObject++; |
| 80 | in.defaultReadObject(); |
| 81 | if (verbose) { |
| 82 | System.out.println("TypeSafeEnum.readObject() " + this.toString()); |
| 83 | } |
| 84 | if (value == null) { |
| 85 | in.registerValidation(this, 0); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | public void validateObject() throws InvalidObjectException { |
| 90 | // only top level case has null for value, validate. |
| 91 | if (numWriteObject != 4) { |
| 92 | throw new Error("Expected 4 calls to writeObject, only " + |
| 93 | numWriteObject + " made"); |
| 94 | } |
| 95 | if (numReadObject != 4) { |
| 96 | throw new Error("Expected 4 calls to readObject, only " + |
| 97 | numReadObject + " made"); |
| 98 | } |
| 99 | if (numWriteReplace != 4) { |
| 100 | throw new Error("Expected 4 calls to writeReplace, only " + |
| 101 | numWriteReplace + " made"); |
| 102 | } |
| 103 | if (numReadResolve != 4) { |
| 104 | throw new Error("Expected 4 calls to readResolve, only " + |
| 105 | numReadResolve + " made"); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | private void writeObject(ObjectOutputStream out) throws IOException |
| 110 | { |
| 111 | numWriteObject++; |
| 112 | out.defaultWriteObject(); |
| 113 | if (verbose) { |
| 114 | System.out.println("TypeSafeEnum.writeObject() " + |
| 115 | this.toString()); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | public String toString() { |
| 120 | return super.toString() + " value=" + value; |
| 121 | } |
| 122 | |
| 123 | public static void main(String args[]) |
| 124 | throws IOException, ClassNotFoundException |
| 125 | { |
| 126 | if (args.length > 0 && args[0].equals("-verbose")) |
| 127 | verbose = true; |
| 128 | |
| 129 | TypeSafeEnum[] writeArray = new TypeSafeEnum[7]; |
| 130 | writeArray[0] = FIRST; |
| 131 | writeArray[1] = SECOND; |
| 132 | writeArray[2] = THIRD; |
| 133 | writeArray[3] = FIRST; |
| 134 | writeArray[4] = SECOND; |
| 135 | writeArray[5] = THIRD; |
| 136 | writeArray[6] = new TypeSafeEnum("Third"); |
| 137 | |
| 138 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| 139 | ObjectOutputStream os = new ObjectOutputStream(baos); |
| 140 | os.writeObject(writeArray); |
| 141 | os.close(); |
| 142 | |
| 143 | TypeSafeEnum[] readArray; |
| 144 | ObjectInputStream in = |
| 145 | new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray())); |
| 146 | readArray = (TypeSafeEnum[])in.readObject(); |
| 147 | in.close(); |
| 148 | |
| 149 | for (int i= 0; i < writeArray.length - 1 ; i++) { |
| 150 | if (writeArray[i] != readArray[i]) { |
| 151 | throw new Error("Serializa/deserialize did not preserve " + |
| 152 | "singleton for " + |
| 153 | readArray[i].toString() + |
| 154 | " and " + writeArray[i].toString()); |
| 155 | } |
| 156 | } |
| 157 | } |
| 158 | }; |