Source Code Cross Referenced for ObjectStreamConstants.java in  » 6.0-JDK-Core » io-nio » java » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » io nio » java.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 1996-2006 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.io;
027
028        /**
029         * Constants written into the Object Serialization Stream. 
030         *
031         * @author  unascribed
032         * @version 1.42, 05/05/07
033         * @since JDK 1.1
034         */
035        public interface ObjectStreamConstants {
036
037            /**
038             * Magic number that is written to the stream header.
039             */
040            final static short STREAM_MAGIC = (short) 0xaced;
041
042            /**
043             * Version number that is written to the stream header.
044             */
045            final static short STREAM_VERSION = 5;
046
047            /* Each item in the stream is preceded by a tag
048             */
049
050            /** 
051             * First tag value.
052             */
053            final static byte TC_BASE = 0x70;
054
055            /**
056             * Null object reference.
057             */
058            final static byte TC_NULL = (byte) 0x70;
059
060            /**
061             * Reference to an object already written into the stream.
062             */
063            final static byte TC_REFERENCE = (byte) 0x71;
064
065            /**
066             * new Class Descriptor.
067             */
068            final static byte TC_CLASSDESC = (byte) 0x72;
069
070            /**
071             * new Object.
072             */
073            final static byte TC_OBJECT = (byte) 0x73;
074
075            /** 
076             * new String.
077             */
078            final static byte TC_STRING = (byte) 0x74;
079
080            /**
081             * new Array.
082             */
083            final static byte TC_ARRAY = (byte) 0x75;
084
085            /**
086             * Reference to Class.
087             */
088            final static byte TC_CLASS = (byte) 0x76;
089
090            /**
091             * Block of optional data. Byte following tag indicates number
092             * of bytes in this block data.
093             */
094            final static byte TC_BLOCKDATA = (byte) 0x77;
095
096            /** 
097             * End of optional block data blocks for an object.
098             */
099            final static byte TC_ENDBLOCKDATA = (byte) 0x78;
100
101            /**
102             * Reset stream context. All handles written into stream are reset.
103             */
104            final static byte TC_RESET = (byte) 0x79;
105
106            /**
107             * long Block data. The long following the tag indicates the
108             * number of bytes in this block data.
109             */
110            final static byte TC_BLOCKDATALONG = (byte) 0x7A;
111
112            /**
113             * Exception during write. 
114             */
115            final static byte TC_EXCEPTION = (byte) 0x7B;
116
117            /**
118             * Long string.
119             */
120            final static byte TC_LONGSTRING = (byte) 0x7C;
121
122            /**
123             * new Proxy Class Descriptor.
124             */
125            final static byte TC_PROXYCLASSDESC = (byte) 0x7D;
126
127            /**
128             * new Enum constant.
129             * @since 1.5
130             */
131            final static byte TC_ENUM = (byte) 0x7E;
132
133            /** 
134             * Last tag value.
135             */
136            final static byte TC_MAX = (byte) 0x7E;
137
138            /**
139             * First wire handle to be assigned. 
140             */
141            final static int baseWireHandle = 0x7e0000;
142
143            /******************************************************/
144            /* Bit masks for ObjectStreamClass flag.*/
145
146            /** 
147             * Bit mask for ObjectStreamClass flag. Indicates a Serializable class 
148             * defines its own writeObject method.
149             */
150            final static byte SC_WRITE_METHOD = 0x01;
151
152            /**
153             * Bit mask for ObjectStreamClass flag. Indicates Externalizable data 
154             * written in Block Data mode.
155             * Added for PROTOCOL_VERSION_2.
156             *
157             * @see #PROTOCOL_VERSION_2
158             * @since 1.2
159             */
160            final static byte SC_BLOCK_DATA = 0x08;
161
162            /**
163             * Bit mask for ObjectStreamClass flag. Indicates class is Serializable.
164             */
165            final static byte SC_SERIALIZABLE = 0x02;
166
167            /**
168             * Bit mask for ObjectStreamClass flag. Indicates class is Externalizable.
169             */
170            final static byte SC_EXTERNALIZABLE = 0x04;
171
172            /**
173             * Bit mask for ObjectStreamClass flag. Indicates class is an enum type.
174             * @since 1.5
175             */
176            final static byte SC_ENUM = 0x10;
177
178            /* *******************************************************************/
179            /* Security permissions */
180
181            /**
182             * Enable substitution of one object for another during 
183             * serialization/deserialization.
184             *
185             * @see java.io.ObjectOutputStream#enableReplaceObject(boolean)
186             * @see java.io.ObjectInputStream#enableResolveObject(boolean)
187             * @since 1.2
188             */
189            final static SerializablePermission SUBSTITUTION_PERMISSION = new SerializablePermission(
190                    "enableSubstitution");
191
192            /**
193             * Enable overriding of readObject and writeObject.
194             *
195             * @see java.io.ObjectOutputStream#writeObjectOverride(Object)
196             * @see java.io.ObjectInputStream#readObjectOverride()
197             * @since 1.2
198             */
199            final static SerializablePermission SUBCLASS_IMPLEMENTATION_PERMISSION = new SerializablePermission(
200                    "enableSubclassImplementation");
201            /**
202             * A Stream Protocol Version. <p>
203             * 
204             * All externalizable data is written in JDK 1.1 external data 
205             * format after calling this method. This version is needed to write 
206             * streams containing Externalizable data that can be read by 
207             * pre-JDK 1.1.6 JVMs.
208             *
209             * @see java.io.ObjectOutputStream#useProtocolVersion(int)
210             * @since 1.2
211             */
212            public final static int PROTOCOL_VERSION_1 = 1;
213
214            /**
215             * A Stream Protocol Version. <p>
216             * 
217             * This protocol is written by JVM 1.2.
218             *
219             * Externalizable data is written in block data mode and is 
220             * terminated with TC_ENDBLOCKDATA. Externalizable classdescriptor
221             * flags has SC_BLOCK_DATA enabled. JVM 1.1.6 and greater can 
222             * read this format change.
223             *
224             * Enables writing a nonSerializable class descriptor into the
225             * stream. The serialVersionUID of a nonSerializable class is 
226             * set to 0L. 
227             *
228             * @see java.io.ObjectOutputStream#useProtocolVersion(int)
229             * @see #SC_BLOCK_DATA
230             * @since 1.2
231             */
232            public final static int PROTOCOL_VERSION_2 = 2;
233        }
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