| /* |
| * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 4140729 |
| * @summary Verify that writeReplace & readResolve are called by serialization. |
| * readResolve is used to maintain the invariant that the enums |
| * of TypeSafeEnum are singletons. |
| */ |
| import java.io.*; |
| |
| public class TypeSafeEnum implements Serializable, ObjectInputValidation { |
| private static int numWriteObject = 0; |
| private static int numReadObject = 0; |
| |
| |
| private String value; |
| private TypeSafeEnum(String value) { |
| this.value = value; |
| } |
| |
| final public static TypeSafeEnum FIRST = new TypeSafeEnum("First"); |
| final public static TypeSafeEnum SECOND = new TypeSafeEnum("Second"); |
| final public static TypeSafeEnum THIRD = new TypeSafeEnum("Third"); |
| static int numReadResolve = 0; |
| static int numWriteReplace = 0; |
| static boolean verbose = false; |
| |
| |
| private Object writeReplace() throws IOException { |
| numWriteReplace++; |
| if (verbose) { |
| System.out.println("TypeSafeEnum.writeReplace() " + |
| this.toString()); |
| } |
| return this; |
| } |
| |
| private Object readResolve() throws IOException { |
| numReadResolve++; |
| if (verbose) { |
| System.out.println("readResolve called on " + this.toString()); |
| } |
| if (value.equals(FIRST.value)) { |
| return FIRST; |
| } else if (value.equals(SECOND.value)) { |
| return SECOND; |
| } else if (value.equals(THIRD.value)) { |
| return THIRD; |
| } else { |
| //unknown type safe enum |
| return this; |
| } |
| } |
| |
| private void readObject(ObjectInputStream in) |
| throws IOException, ClassNotFoundException |
| { |
| numReadObject++; |
| in.defaultReadObject(); |
| if (verbose) { |
| System.out.println("TypeSafeEnum.readObject() " + this.toString()); |
| } |
| if (value == null) { |
| in.registerValidation(this, 0); |
| } |
| } |
| |
| public void validateObject() throws InvalidObjectException { |
| // only top level case has null for value, validate. |
| if (numWriteObject != 4) { |
| throw new Error("Expected 4 calls to writeObject, only " + |
| numWriteObject + " made"); |
| } |
| if (numReadObject != 4) { |
| throw new Error("Expected 4 calls to readObject, only " + |
| numReadObject + " made"); |
| } |
| if (numWriteReplace != 4) { |
| throw new Error("Expected 4 calls to writeReplace, only " + |
| numWriteReplace + " made"); |
| } |
| if (numReadResolve != 4) { |
| throw new Error("Expected 4 calls to readResolve, only " + |
| numReadResolve + " made"); |
| } |
| } |
| |
| private void writeObject(ObjectOutputStream out) throws IOException |
| { |
| numWriteObject++; |
| out.defaultWriteObject(); |
| if (verbose) { |
| System.out.println("TypeSafeEnum.writeObject() " + |
| this.toString()); |
| } |
| } |
| |
| public String toString() { |
| return super.toString() + " value=" + value; |
| } |
| |
| public static void main(String args[]) |
| throws IOException, ClassNotFoundException |
| { |
| if (args.length > 0 && args[0].equals("-verbose")) |
| verbose = true; |
| |
| TypeSafeEnum[] writeArray = new TypeSafeEnum[7]; |
| writeArray[0] = FIRST; |
| writeArray[1] = SECOND; |
| writeArray[2] = THIRD; |
| writeArray[3] = FIRST; |
| writeArray[4] = SECOND; |
| writeArray[5] = THIRD; |
| writeArray[6] = new TypeSafeEnum("Third"); |
| |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| ObjectOutputStream os = new ObjectOutputStream(baos); |
| os.writeObject(writeArray); |
| os.close(); |
| |
| TypeSafeEnum[] readArray; |
| ObjectInputStream in = |
| new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray())); |
| readArray = (TypeSafeEnum[])in.readObject(); |
| in.close(); |
| |
| for (int i= 0; i < writeArray.length - 1 ; i++) { |
| if (writeArray[i] != readArray[i]) { |
| throw new Error("Serializa/deserialize did not preserve " + |
| "singleton for " + |
| readArray[i].toString() + |
| " and " + writeArray[i].toString()); |
| } |
| } |
| } |
| }; |