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java.io
Interface ObjectStreamConstants

All Known Implementing Classes:

ObjectInputStream, ObjectOutputStream

public interface ObjectStreamConstants

Constants written into the Object Serialization Stream.

Since:

JDK 1.1

Field Summary

static int	baseWireHandle First wire handle to be assigned.
static int	PROTOCOL_VERSION_1 A Stream Protocol Version.
static int	PROTOCOL_VERSION_2 A Stream Protocol Version.
static byte	SC_BLOCK_DATA Bit mask for ObejctStreamClass flag.
static byte	SC_EXTERNALIZABLE Bit mask for ObjectStreamClass flag.
static byte	SC_SERIALIZABLE Bit mask for ObjectStreamClass flag.
static byte	SC_WRITE_METHOD Bit mask for ObjectStreamClass flag.
static short	STREAM_MAGIC Magic number that is written to the stream header.
static short	STREAM_VERSION Version number that is written to the stream header.
static SerializablePermission	SUBCLASS_IMPLEMENTATION_PERMISSION Enable overriding of readObject and writeObject.
static SerializablePermission	SUBSTITUTION_PERMISSION Enable substitution of one object for another during serialization/deserialization.
static byte	TC_ARRAY new Array.
static byte	TC_BASE First tag value.
static byte	TC_BLOCKDATA Block of optional data.
static byte	TC_BLOCKDATALONG long Block data.
static byte	TC_CLASS Reference to Class.
static byte	TC_CLASSDESC new Class Descriptor.
static byte	TC_ENDBLOCKDATA End of optional block data blocks for an object.
static byte	TC_EXCEPTION Exception during write.
static byte	TC_LONGSTRING Long string.
static byte	TC_MAX Last tag value.
static byte	TC_NULL Null object reference.
static byte	TC_OBJECT new Object.
static byte	TC_PROXYCLASSDESC new Proxy Class Descriptor.
static byte	TC_REFERENCE Reference to an object already written into the stream.
static byte	TC_RESET Reset stream context.
static byte	TC_STRING new String.

Field Detail

STREAM_MAGIC

public static final short STREAM_MAGIC

Magic number that is written to the stream header.

STREAM_VERSION

public static final short STREAM_VERSION

Version number that is written to the stream header.

TC_BASE

public static final byte TC_BASE

First tag value.

TC_NULL

public static final byte TC_NULL

Null object reference.

TC_REFERENCE

public static final byte TC_REFERENCE

Reference to an object already written into the stream.

TC_CLASSDESC

public static final byte TC_CLASSDESC

new Class Descriptor.

TC_OBJECT

public static final byte TC_OBJECT

new Object.

TC_STRING

public static final byte TC_STRING

new String.

TC_ARRAY

public static final byte TC_ARRAY

new Array.

TC_CLASS

public static final byte TC_CLASS

Reference to Class.

TC_BLOCKDATA

public static final byte TC_BLOCKDATA

Block of optional data. Byte following tag indicates number of bytes in this block data.

TC_ENDBLOCKDATA

public static final byte TC_ENDBLOCKDATA

End of optional block data blocks for an object.

TC_RESET

public static final byte TC_RESET

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

TC_BLOCKDATALONG

public static final byte TC_BLOCKDATALONG

long Block data. The long following the tag indicates the number of bytes in this block data.

TC_EXCEPTION

public static final byte TC_EXCEPTION

Exception during write.

TC_LONGSTRING

public static final byte TC_LONGSTRING

Long string.

TC_PROXYCLASSDESC

public static final byte TC_PROXYCLASSDESC

new Proxy Class Descriptor.

TC_MAX

public static final byte TC_MAX

Last tag value.

baseWireHandle

public static final int baseWireHandle

First wire handle to be assigned.

SC_WRITE_METHOD

public static final byte SC_WRITE_METHOD

Bit mask for ObjectStreamClass flag. Indicates a Serializable class defines its own writeObject method.

SC_BLOCK_DATA

public static final byte SC_BLOCK_DATA

Bit mask for ObejctStreamClass flag. Indicates Externalizable data written in Block Data mode. Added for PROTOCOL_VERSION_2.

See Also:

PROTOCOL_VERSION_2

Since:

1.2

SC_SERIALIZABLE

public static final byte SC_SERIALIZABLE

Bit mask for ObjectStreamClass flag. Indicates class is Serializable.

SC_EXTERNALIZABLE

public static final byte SC_EXTERNALIZABLE

Bit mask for ObjectStreamClass flag. Indicates class is Externalizable.

SUBSTITUTION_PERMISSION

public static final SerializablePermission SUBSTITUTION_PERMISSION

Enable substitution of one object for another during serialization/deserialization.

See Also:

ObjectOutputStream.enableReplaceObject(boolean), ObjectInputStream.enableResolveObject(boolean)

Since:

1.2

SUBCLASS_IMPLEMENTATION_PERMISSION

public static final SerializablePermission SUBCLASS_IMPLEMENTATION_PERMISSION

Enable overriding of readObject and writeObject.

See Also:

ObjectOutputStream.writeObjectOverride(Object), ObjectInputStream.readObjectOverride()

Since:

1.2

PROTOCOL_VERSION_1

public static final int PROTOCOL_VERSION_1

A Stream Protocol Version.

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 Also:

ObjectOutputStream.useProtocolVersion(int)

Since:

1.2

PROTOCOL_VERSION_2

public static final int PROTOCOL_VERSION_2

A Stream Protocol Version.

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 Also:

ObjectOutputStream.useProtocolVersion(int), SC_BLOCK_DATA

Since:

1.2