1 /* 2 * Copyright (c) 1998, 2016, 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 /* @test 25 @bug 4136620 4144590 26 @summary Make sure that Attribute & subclasses are serialized and deserialized correctly 27 @modules java.desktop 28 */ 29 30 import java.text.AttributedCharacterIterator.Attribute; 31 import java.awt.font.TextAttribute; 32 import java.io.*; 33 34 public class ReadResolve { 35 36 public static void main(String[] args) throws Exception { 37 testSerializationCycle(Attribute.LANGUAGE); 38 testSerializationCycle(TextAttribute.INPUT_METHOD_HIGHLIGHT); 39 40 boolean gotException = false; 41 Attribute result = null; 42 try { 43 result = doSerializationCycle(FakeAttribute.LANGUAGE); 44 } catch (Throwable e) { 45 gotException = true; 46 } 47 if (!gotException) { 48 throw new RuntimeException("Attribute should throw an exception when given a fake \"language\" attribute. Deserialized object: " + result); 49 } 50 } 51 52 static Attribute doSerializationCycle(Attribute attribute) throws Exception { 53 54 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 55 ObjectOutputStream oos = new ObjectOutputStream(baos); 56 oos.writeObject(attribute); 57 oos.flush(); 58 59 byte[] data = baos.toByteArray(); 60 61 ByteArrayInputStream bais = new ByteArrayInputStream(data); 62 ObjectInputStream ois = new ObjectInputStream(bais); 63 Attribute result = (Attribute) ois.readObject(); 64 65 return result; 66 } 67 68 static void testSerializationCycle(Attribute attribute) throws Exception { 69 Attribute result = doSerializationCycle(attribute); 70 if (result != attribute) { 71 throw new RuntimeException("attribute changed identity during serialization/deserialization"); 72 } 73 } 74 75 private static class FakeAttribute extends Attribute { 76 77 // This LANGUAGE attribute should never be confused with the 78 // Attribute.LANGUAGE attribute. However, we don't override 79 // readResolve here, so that deserialization goes 80 // to Attribute. Attribute has to catch this problem and reject 81 // the fake attribute. 82 static final FakeAttribute LANGUAGE = new FakeAttribute("language"); 83 84 FakeAttribute(String name) { 85 super(name); 86 } 87 } 88 }