Class: ObjectCoder

• Inheritance
• Description
• Related information
• Class protocol
  • encoding
  • instance creation
• Instance protocol
  • accessing
  • decoding
  • encoding
  • encoding-smalltalk types
  • initialization
  • private-accessing

Inheritance:

   Object
   |
   +--Visitor
      |
      +--AspectVisitor
         |
         +--ObjectCoder
            |
            +--BaseNCoder
            |
            +--JSONPrinter
            |
            +--XMLCoder

Package:

stx:libbasic

Category:

System-Storage

Version:

rev: 1.15 date: 2005/11/16 08:47:25

user: stefan

file: ObjectCoder.st directory: libbasic

module: stx stc-classLibrary: libbasic

Author:

Stefan Vogel

Description:

This is an abstract class. Subclasses implement encoding and decoding
of Objects onto resp. from a stream. Possible coders are ASN.1/BER,
CORBA/CDR, BOSS, RMI ...

Classes which implement basic types (Boolean, Integer, Float, ...)
implement the visitor methods #acceptVisitor:with:, which dispatches onto an ObjectCoder.



[instance variables:]
    stream  <Stream>        the stream we read/write the encodings from/to

[class variables:]

Related information:

    OSI::ASN1_Coder

Class protocol:

 decode: anObject

decode anObject

 decodingOf: anObject

use encode

** This is an obsolete interface - do not use it (it may vanish in future versions) **

 encode: anObject

encode of anObject

 encode: anObject on: aStream

 encode: anObject on: aStream with: info

 encode: anObject with: aParameter

return the encoding of anObject

 encodingOf: anObject

use #encode:

** This is an obsolete interface - do not use it (it may vanish in future versions) **

 encodingOf: anObject with: aParameter

use #encode:with:

** This is an obsolete interface - do not use it (it may vanish in future versions) **

 on: aStream

return an encoder/decoder for a stream

Instance protocol:

 contents

 next

read, decode and return the next object

** This method raises an error - it must be redefined in concrete classes **

 encodingOf: anObject

answer the encoded argument anObject

 encodingOf: anObject with: aParameter

answer the encoded argument anObject

 nextPut: anObject

encode anObject onto my stream

 nextPut: anObject with: aParameter

encode anObject onto my stream

 nextPutAll: aCollectionOfObjects

encode all objects from the argument

 visitBlock: aBlock with: aParameter

encoding of blocks is rather difficult and an error by default.
If your encoder supports this, redefine it there

 close

close the underlying stream

 emptyWriteStream

answer an empty stream for writing the encoded object

** This method raises an error - it must be redefined in concrete classes **

 flush

flush possibly internally buffered data.
Nothing is done by default. Subclasses may redefine this

 reset

reset the coder

 stream: aStream