Serializable/unshared/Write.java

/*
 * Copyright (c) 2000, 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 4311991
 *
 * @clean Write Read Foo Bar
 * @compile Write.java
 * @run main Write
 * @clean Write Read Foo Bar
 * @compile Read.java
 * @run main Read
 *
 * @summary Test ObjectOutputStream.writeUnshared/readUnshared functionality.
 */

import java.io.*;

class Foo implements Serializable {
    private static final ObjectStreamField[] serialPersistentFields =
        new ObjectStreamField[] {
            new ObjectStreamField("shared1", String.class),
            new ObjectStreamField("shared2", String.class, false),
            new ObjectStreamField("unshared1", String.class, true),
            new ObjectStreamField("unshared2", String.class, true)
        };

    String shared1, shared2, unshared1, unshared2;

    Foo() {
        shared1 = shared2 = unshared1 = unshared2 = "foo";
    }
}

class Bar implements Serializable {
    private static final long serialVersionUID = 0L;
    Object obj;

    Bar(Object obj) {
        this.obj = obj;
    }
}

public class Write {
    public static void main(String[] args) throws Exception {
        String str1 = "foo";
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oout = new ObjectOutputStream(bout);

        oout.writeObject(str1);
        oout.writeObject(str1);
        oout.writeUnshared(str1);
        oout.writeUnshared(str1);
        oout.writeObject(new Foo());
        oout.close();

        ByteArrayInputStream bin =
            new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream oin = new ObjectInputStream(bin);
        str1 = (String) oin.readObject();
        if (oin.readObject() != str1) {
            throw new Error();
        }
        String str2 = (String) oin.readObject();
        String str3 = (String) oin.readObject();
        if (str2 == str1 || str3 == str1 || str2 == str3) {
            throw new Error();
        }
        if (! (str1.equals(str2) && str1.equals(str3))) {
            throw new Error();
        }

        Foo foo = (Foo) oin.readObject();
        if ((foo.shared1 != foo.shared2) ||
            (foo.shared1 == foo.unshared1) ||
            (foo.shared1 == foo.unshared2) ||
            (foo.shared2 == foo.unshared1) ||
            (foo.shared2 == foo.unshared2) ||
            (foo.unshared1 == foo.unshared2))
        {
            throw new Error();
        }

        // write out object to be read by Read.main()
        oout = new ObjectOutputStream(new FileOutputStream("tmp.ser"));
        oout.writeObject(new Bar(str1));
        oout.writeObject(str1);
        oout.close();
    }
}