6.4.1 文法規則

直列化されたストリームは、ストリーム規則を満たす任意のストリームによって表されます。

stream:
  magic version contents

contents:
  content
  contents content

content:
  object
  blockdata

object:
  newObject
  newClass
  newArray
  newString
  newClassDesc
  prevObject
  nullReference
  exception
  TC_RESET

newClass:
TC_CLASS classDesc newHandle

classDesc:
newClassDesc
nullReference
(ClassDesc)prevObject      // an object required to be of type
                          // ClassDesc

superClassDesc:
classDesc

newClassDesc:
TC_CLASSDESC className serialVersionUID newHandle classDescInfo
TC_PROXYCLASSDESC newHandle proxyClassDescInfo

classDescInfo:
classDescFlags fields classAnnotation superClassDesc

className:
(utf)

serialVersionUID:
(long)

classDescFlags:
(byte)                  // Defined in Terminal Symbols and
                       // Constants

proxyClassDescInfo:
(int)<count> proxyInterfaceName[count] classAnnotation
superClassDesc

proxyInterfaceName:

  (utf)

fields:
(short)<count>  fieldDesc[count]

fieldDesc:
primitiveDesc
objectDesc

primitiveDesc:
prim_typecode fieldName

objectDesc:
obj_typecode fieldName className1

fieldName:
(utf)

className1:
(String)object             // String containing the field's type

classAnnotation:
endBlockData
contents endBlockData      // contents written by annotateClass

prim_typecode:
`B'	// byte
`C'	// char
`D'	// double
`F'	// float
`I'	// integer
`J'	// long
`S'	// short
`Z'	// boolean

obj_typecode:
`[`	// array
`L'	// object

newArray:
TC_ARRAY classDesc newHandle (int)<size> values[size]

newObject:
TC_OBJECT classDesc newHandle classdata[]  // data for each class

classdata:
nowrclass                  // SC_SERIALIZABLE & classDescFlag &&
                           // !(SC_WRITE_METHOD & classDescFlags)
wrclass objectAnnotation   // SC_SERIALIZABLE & classDescFlag &&
                           // SC_WRITE_METHOD & classDescFlags
externalContents           // SC_EXTERNALIZABLE & classDescFlag &&
                           // !(SC_BLOCKDATA  & classDescFlags
objectAnnotation           // SC_EXTERNALIZABLE & classDescFlag&&
                           // SC_BLOCKDATA & classDescFlags

nowrclass:
values                    // fields in order of class descriptor

wrclass:
nowrclass

objectAnnotation:
endBlockData
contents endBlockData     // contents written by writeObject
                          // or writeExternal PROTOCOL_VERSION_2.

blockdata:
blockdatashort
blockdatalong

blockdatashort:
TC_BLOCKDATA (unsigned byte)<size> (byte)[size]

blockdatalong:
TC_BLOCKDATALONG (int)<size> (byte)[size]

endBlockData	:
TC_ENDBLOCKDATA

externalContent:         // Only parseable by 
readExternal
( bytes)                 // primitive data
object

externalContents:        // externalContent written by
externalContent          // writeExternal in PROTOCOL_VERSION_1.
externalContents externalContent

newString:
TC_STRING newHandle (utf)
TC_LONGSTRING newHandle (long-utf)

prevObject
TC_REFERENCE (int)handle

nullReference
TC_NULL

exception:
TC_EXCEPTION reset (Throwable)object	 reset

magic:
STREAM_MAGIC

version
STREAM_VERSION

values:                   // The size and types are 
described by the
                          // classDesc for the current object

newHandle:               // The next number in sequence 
is assigned
                        // to the object being serialized or deserialized

reset:                  // The set of known objects is 
discarded
                        // so the objects of the exception do not
                        // overlap with the previously sent objects
                        // or with objects that may be sent after
                        // the exception