/*

  * Copyright (c) 1996, 2006, 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.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * 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.

  */

 package java.io;

 /**

  * Constants written into the Object Serialization Stream.

  *

  * @author  unascribed

  * @since JDK 1.1

  */

 public interface ObjectStreamConstants {

     /**

      * Magic number that is written to the stream header.

      */

     final static short STREAM_MAGIC = (short)0xaced;

     /**

      * Version number that is written to the stream header.

      */

     final static short STREAM_VERSION = 5;

     /* Each item in the stream is preceded by a tag

      */

     /**

      * First tag value.

      */

     final static byte TC_BASE = 0x70;

     /**

      * Null object reference.

      */

     final static byte TC_NULL =         (byte)0x70;

     /**

      * Reference to an object already written into the stream.

      */

     final static byte TC_REFERENCE =    (byte)0x71;

     /**

      * new Class Descriptor.

      */

     final static byte TC_CLASSDESC =    (byte)0x72;

     /**

      * new Object.

      */

     final static byte TC_OBJECT =       (byte)0x73;

     /**

      * new String.

      */

     final static byte TC_STRING =       (byte)0x74;

     /**

      * new Array.

      */

     final static byte TC_ARRAY =        (byte)0x75;

     /**

      * Reference to Class.

      */

     final static byte TC_CLASS =        (byte)0x76;

     /**

      * Block of optional data. Byte following tag indicates number

      * of bytes in this block data.

      */

     final static byte TC_BLOCKDATA =    (byte)0x77;

     /**

      * End of optional block data blocks for an object.

      */

     final static byte TC_ENDBLOCKDATA = (byte)0x78;

     /**

      * Reset stream context. All handles written into stream are reset.

      */

     final static byte TC_RESET =        (byte)0x79;

     /**

      * long Block data. The long following the tag indicates the

      * number of bytes in this block data.

      */

     final static byte TC_BLOCKDATALONG= (byte)0x7A;

     /**

      * Exception during write.

      */

     final static byte TC_EXCEPTION =    (byte)0x7B;

     /**

      * Long string.

      */

     final static byte TC_LONGSTRING =   (byte)0x7C;

     /**

      * new Proxy Class Descriptor.

      */

     final static byte TC_PROXYCLASSDESC =       (byte)0x7D;

     /**

      * new Enum constant.

      * @since 1.5

      */

     final static byte TC_ENUM =         (byte)0x7E;

     /**

      * Last tag value.

      */

     final static byte TC_MAX =          (byte)0x7E;

     /**

      * First wire handle to be assigned.

      */

     final static int baseWireHandle = 0x7e0000;

     /******************************************************/

     /* Bit masks for ObjectStreamClass flag.*/

     /**

      * Bit mask for ObjectStreamClass flag. Indicates a Serializable class

      * defines its own writeObject method.

      */

     final static byte SC_WRITE_METHOD = 0x01;

     /**

      * Bit mask for ObjectStreamClass flag. Indicates Externalizable data

      * written in Block Data mode.

      * Added for PROTOCOL_VERSION_2.

      *

      * @see #PROTOCOL_VERSION_2

      * @since 1.2

      */

     final static byte SC_BLOCK_DATA = 0x08;

     /**

      * Bit mask for ObjectStreamClass flag. Indicates class is Serializable.

      */

     final static byte SC_SERIALIZABLE = 0x02;

     /**

      * Bit mask for ObjectStreamClass flag. Indicates class is Externalizable.

      */

     final static byte SC_EXTERNALIZABLE = 0x04;

     /**

      * Bit mask for ObjectStreamClass flag. Indicates class is an enum type.

      * @since 1.5

      */

     final static byte SC_ENUM = 0x10;

     /* *******************************************************************/

     /* Security permissions */

    /**

     * A Stream Protocol Version. <p>

     *

     * All externalizable data is written in JDK 1.1 external data

     * format after calling this method. This version is needed to write

     * streams containing Externalizable data that can be read by

     * pre-JDK 1.1.6 JVMs.

     *

     * @see java.io.ObjectOutputStream#useProtocolVersion(int)

     * @since 1.2

     */

     public final static int PROTOCOL_VERSION_1 = 1;

    /**

     * A Stream Protocol Version. <p>

     *

     * This protocol is written by JVM 1.2.

     *

     * Externalizable data is written in block data mode and is

     * terminated with TC_ENDBLOCKDATA. Externalizable classdescriptor

     * flags has SC_BLOCK_DATA enabled. JVM 1.1.6 and greater can

     * read this format change.

     *

     * Enables writing a nonSerializable class descriptor into the

     * stream. The serialVersionUID of a nonSerializable class is

     * set to 0L.

     *

     * @see java.io.ObjectOutputStream#useProtocolVersion(int)

     * @see #SC_BLOCK_DATA

     * @since 1.2

     */

     public final static int PROTOCOL_VERSION_2 = 2;

 }