/* * 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 */     /**     * Enable substitution of one object for another during     * serialization/deserialization.     *     * @see java.io.ObjectOutputStream#enableReplaceObject(boolean)     * @see java.io.ObjectInputStream#enableResolveObject(boolean)     * @since 1.2     */    final static SerializablePermission SUBSTITUTION_PERMISSION =                           new SerializablePermission("enableSubstitution");     /**     * Enable overriding of readObject and writeObject.     *     * @see java.io.ObjectOutputStream#writeObjectOverride(Object)     * @see java.io.ObjectInputStream#readObjectOverride()     * @since 1.2     */    final static SerializablePermission SUBCLASS_IMPLEMENTATION_PERMISSION =                    new SerializablePermission("enableSubclassImplementation");   /**    * 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;}