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/*
* Copyright (c) 1999, 2010, 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 4227189
* @summary Ensure that class descriptor read, write hooks exist, are backwards
* compatible, and work as advertised.
*/
import java.io.*;
import java.util.*;
class Foo implements Serializable {
private static final long serialVersionUID = 1L;
Short s = new Short((short) 1);
Integer i = new Integer(2);
Long l = new Long(3);
public boolean equals(Object obj) {
if (obj instanceof Foo) {
Foo ofoo = (Foo) obj;
return s.equals(ofoo.s) && i.equals(ofoo.i) && l.equals(ofoo.l);
}
return false;
}
}
class CustomOutputStream extends ObjectOutputStream {
boolean hookCalled = false;
CustomOutputStream(OutputStream out) throws IOException {
super(out);
useProtocolVersion(PROTOCOL_VERSION_2);
}
protected void writeClassDescriptor(ObjectStreamClass desc)
throws IOException
{
writeUTF(desc.getName());
hookCalled = true;
}
}
class CustomInputStream extends ObjectInputStream {
boolean hookCalled = false;
CustomInputStream(InputStream in) throws IOException {
super(in);
}
protected ObjectStreamClass readClassDescriptor()
throws IOException, ClassNotFoundException
{
hookCalled = true;
return ObjectStreamClass.lookup(Class.forName(readUTF()));
}
}
public class ClassDescHooks implements ObjectStreamConstants {
public static void main(String[] args) throws Exception {
ByteArrayOutputStream bout;
ByteArrayInputStream bin;
ObjectOutputStream oout;
ObjectInputStream oin;
FileInputStream fin;
File foof;
CustomOutputStream cout;
CustomInputStream cin;
// test for backwards compatibility
bout = new ByteArrayOutputStream();
foof = new File(System.getProperty("test.src", "."), "Foo.ser");
fin = new FileInputStream(foof);
try {
while (fin.available() > 0)
bout.write(fin.read());
} finally {
fin.close();
}
byte[] buf1 = bout.toByteArray();
bout = new ByteArrayOutputStream();
oout = new ObjectOutputStream(bout);
Foo foo = new Foo();
oout.writeObject(foo);
oout.flush();
byte[] buf2 = bout.toByteArray();
if (! Arrays.equals(buf1, buf2))
throw new Error("Incompatible stream format (write)");
Foo foocopy;
fin = new FileInputStream(foof);
try {
oin = new ObjectInputStream(fin);
foocopy = (Foo) oin.readObject();
if (! foo.equals(foocopy))
throw new Error("Incompatible stream format (read)");
} finally {
fin.close();
}
// make sure write hook not called when old protocol in use
bout = new ByteArrayOutputStream();
cout = new CustomOutputStream(bout);
cout.useProtocolVersion(PROTOCOL_VERSION_1);
cout.writeObject(foo);
if (cout.hookCalled)
throw new Error("write descriptor hook should not be called");
// write custom class descriptor representations
bout = new ByteArrayOutputStream();
cout = new CustomOutputStream(bout);
cout.writeObject(foo);
cout.flush();
bin = new ByteArrayInputStream(bout.toByteArray());
cin = new CustomInputStream(bin);
foocopy = (Foo) cin.readObject();
if (! cout.hookCalled)
throw new Error("write descriptor hook never called");
if (! cin.hookCalled)
throw new Error("read descriptor hook never called");
if (! foo.equals(foocopy))
throw new Error("serialization failed when hooks active");
}
}
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