1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* Copyright (c) 1998, 2012, 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 4099013
* @summary Enable substitution of String and Array by ObjectStreams.
*/
import java.io.*;
import java.lang.reflect.Array;
class A implements Serializable {
String stringA;
String stringB;
String stringC;
String[] arrayOfString;
A() {
stringA = "hello";
stringB = "goodbye";
stringC = stringA;
arrayOfString = new String[2];
for (int i = 0; i < arrayOfString.length; i++)
arrayOfString[i] = new String("array element " + i);
}
void report() {
System.out.println("stringA = " + stringA);
System.out.println("stringB = " + stringB);
System.out.println("stringC = " + stringC);
System.out.println("length of arrayOfString = " +
arrayOfString.length);
for (int i = 0; i < arrayOfString.length; i++)
System.out.println("arrayOfString[" + i + "]= " +
arrayOfString[i]);
}
}
class SubstituteObjectOutputStream extends ObjectOutputStream {
public int numStringsReplaced = 0;
public int numArraysCounted = 0;
public SubstituteObjectOutputStream(OutputStream out) throws IOException {
super(out);
enableReplaceObject(true);
}
protected Object replaceObject(Object obj) throws IOException {
if (obj instanceof String) {
numStringsReplaced++;
return obj + "_WriteReplaced";
}
if (obj.getClass().isArray()) {
Object[] array = (Object[]) obj;
/* Double the array.
* Initialize new array elements with original array. */
Class arrayComponentType = array.getClass().getComponentType();
Object[] newarray =
(Object[])Array.newInstance(arrayComponentType,
array.length * 2);
for (int i = 0; i < array.length; i++)
newarray[i] = array[i];
for (int ni = array.length; ni < 2* array.length; ni++)
newarray[ni] = array[ni - array.length];
numArraysCounted++;
obj = newarray;
}
return obj;
}
}
class SubstituteObjectInputStream extends ObjectInputStream {
public int numStringsReplaced = 0;
public int numArraysCounted = 0;
public SubstituteObjectInputStream(InputStream in) throws IOException {
super(in);
enableResolveObject(true);
}
protected Object resolveObject(Object obj) throws IOException {
if (obj instanceof String) {
numStringsReplaced++;
return obj + "_ReadResolved";
}
if (obj.getClass().isArray()) {
Object[] array = (Object[])obj;
/* Double the array.
* Initialize new array elements with original array. */
Class arrayComponentType = array.getClass().getComponentType();
Object[] newarray =
(Object[])Array.newInstance(arrayComponentType,
array.length * 2);
for (int i = 0; i < array.length; i++)
newarray[i] = array[i];
for (int ni = array.length; ni < 2* array.length; ni++)
newarray[ni] = array[ni - array.length];
numArraysCounted++;
obj = newarray;
}
return obj;
}
}
public class ReplaceStringArray {
public static void main(String args[]) throws IOException, ClassNotFoundException {
boolean verbose = false;
if (args.length >= 1 && args[0].compareTo("verbose") == 0)
verbose = true;
A a = new A();
if (verbose) {
System.out.println("Value of Class A");
a.report();
System.out.println("");
}
/* Serialize object a to bytestream. */
if (verbose) {
System.out.println("Serialize A to SubstituteObjectOutputStream");
System.out.println("");
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
SubstituteObjectOutputStream out = new SubstituteObjectOutputStream(baos);
out.writeObject(a);
out.close();
a = null;
/* Validate that writeReplace called by SubstituteObjectOutputStream.*/
boolean expectedResult = (out.numStringsReplaced == 4);
if (!expectedResult)
throw new Error("Expected " + 4 + " strings to be replaced during serialization;" +
" only " + out.numStringsReplaced + " strings were replaced.");
if (out.numArraysCounted != 1)
throw new Error("Expected 1 array during serialization; only " +
out.numArraysCounted + " arrays");
if (verbose) {
System.out.println("DeSerialize A from SubstituteObjectInputStream");
System.out.println("");
}
SubstituteObjectInputStream in =
new SubstituteObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
a = (A)in.readObject();
in.close();
/* Validate that readResolve called by SubstituteObjectInputStream.*/
if (in.numStringsReplaced != 4)
throw new Error("Expected 4 strings to be resolved during deserialization;" +
" only " + in.numStringsReplaced + " strings were resolved.");
if (in.numArraysCounted != 1)
throw new Error("Expected 1 array during deserialization; only " +
out.numArraysCounted + " arrays");
if (a.arrayOfString.length != 8)
throw new Error("Expected a.arrayOfString.length to be 8, observed " +
a.arrayOfString.length);
if (verbose) {
System.out.println("Value of Class A after serialize/deserialize with writeReplace/readResolve");
a.report();
}
}
}
|
