Source Code Cross Referenced for ObjectStreamConstants.java in  » 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 » 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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