/*

 * 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 4461737

 * @summary Verify that serialization functions properly for externalizable

 *          classes if ObjectInputStream.readClassDescriptor() returns a local

 *          class descriptor.

 */

import java.io.*;

import java.util.*;

class LoopbackOutputStream extends ObjectOutputStream {

        throws IOException

    {

        super(out);

        this.descs = descs;

    }

    protected void writeClassDescriptor(ObjectStreamClass desc)

        throws IOException

    {

        descs.add(desc);

    }

}

class LoopbackInputStream extends ObjectInputStream {

        super(in);

        this.descs = descs;

    }

    protected ObjectStreamClass readClassDescriptor()

        throws IOException, ClassNotFoundException

    {

    }

}

public class ExternLoopback implements Externalizable {

    String a, b, c;

    public ExternLoopback() {

    }

    ExternLoopback(String a, String b, String c) {

        this.a = a;

        this.b = b;

        this.c = c;

    }

    public void writeExternal(ObjectOutput out) throws IOException {

        out.writeBoolean(false);

        out.writeObject(a);

        out.writeObject(b);

        out.writeObject(c);

    }

    public void readExternal(ObjectInput in)

        throws IOException, ClassNotFoundException

    {

        in.readBoolean();

        a = (String) in.readObject();

        b = (String) in.readObject();

        c = (String) in.readObject();

    }

    public boolean equals(Object obj) {

        if (!(obj instanceof ExternLoopback)) {

            return false;

        }

        ExternLoopback other = (ExternLoopback) obj;

        return streq(a, other.a) && streq(b, other.b) && streq(c, other.c);

    }

    static boolean streq(String s1, String s2) {

        return (s1 != null) ? s1.equals(s2) : (s2 == null);

    }

    public static void main(String[] args) throws Exception {

        ExternLoopback lb = new ExternLoopback("foo", "bar", "baz");

        ByteArrayOutputStream bout = new ByteArrayOutputStream();

        LoopbackOutputStream lout = new LoopbackOutputStream(bout, descs);

        lout.writeObject(lb);

        lout.close();

        LoopbackInputStream lin = new LoopbackInputStream(

            new ByteArrayInputStream(bout.toByteArray()), descs);

        ExternLoopback lbcopy = (ExternLoopback) lin.readObject();

        if (!lb.equals(lbcopy)) {

            throw new Error();

        }

    }

}