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"
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COPYRIGHT (c) 2000 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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"{ Package: 'private' }"
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Object subclass:#ObjectCoder
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instanceVariableNames:'stream'
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classVariableNames:''
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poolDictionaries:''
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category:'System-Storage'
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!
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!ObjectCoder class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2000 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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This is an abstract class. Subclasses implement encoding and decoding
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of Objects onto resp. from a stream. Possible coders are ASN.1/BER,
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CORBA/CDR, BOSS, RMI ...
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Classes which implement basic types (Boolean, Integer, Float, ...)
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implement #encodeOn:with:, which dispatches onto an ObjectCoder.
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[author:]
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Stefan Vogel
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[see also:]
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OSI::ASN1_Coder
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[instance variables:]
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stream <Stream> the stream we read/write the encodings from/to
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[class variables:]
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"
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! !
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!ObjectCoder class methodsFor:'instance creation'!
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on:aStream
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"return an encoder/decoder for a stream"
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^ self new stream:aStream
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! !
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!ObjectCoder class methodsFor:'encoding'!
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encodingOf:anObject
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"return the encoding of anObject"
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^ self new encodingOf:anObject with:nil
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!
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encodingOf:anObject with:aParameter
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"return the encoding of anObject"
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^ self new encodingOf:anObject with:aParameter
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! !
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!ObjectCoder methodsFor:'decoding'!
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next
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"read, decode and return the next object"
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^ self subclassResponsibility
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! !
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!ObjectCoder methodsFor:'encoding'!
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encodingOf:anObject
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"answer the encoded argument anObject"
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^ self encodingOf:anObject with:nil
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!
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encodingOf:anObject with:aParameter
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"answer the encoded argument anObject"
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stream isNil ifTrue:[
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stream := WriteStream on:(ByteArray new:20).
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] ifFalse:[
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stream reset.
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].
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anObject encodeOn:self with:aParameter.
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^ stream contents.
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!
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nextPut:anObject
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"encode anObject onto my stream"
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anObject encodeOn:self with:nil.
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!
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nextPutAll:aCollectionOfObjects
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"encode all objects from the argument"
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aCollectionOfObjects do:[:o |
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self nextPut:o
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]
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! !
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!ObjectCoder methodsFor:'encoding-smalltalk-types'!
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encodeAbsoluteTime:anAbsoluteTime with:aParameter
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"encode an absolute time value"
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self encodeObject:anAbsoluteTime with:aParameter
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!
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encodeBitArray:aBitArray with:aParameter
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"encode a BitArray"
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self encodeObject:aBitArray with:aParameter
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!
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encodeBoolean:aBoolean with:aParameter
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"encode a Boolean"
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self encodeObject:aBoolean with:aParameter
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!
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encodeByteArray:aByteArray with:aParameter
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"encode an absolute time value"
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self encodeObject:aByteArray with:aParameter
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!
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encodeCharacter:aCharacter with:aParameter
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"encode a Character"
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self encodeObject:aCharacter with:aParameter
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!
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encodeDictionary:aDictionary with:aParameter
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"encode a Dictionary"
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self encodeObject:aDictionary with:aParameter
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!
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encodeFloat:aFloat with:aParameter
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"encode a Float"
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self encodeObject:aFloat with:aParameter
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!
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encodeInteger:anInteger with:aParameter
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"encode an Integer"
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self encodeObject:anInteger with:aParameter
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!
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encodeNilWith:aParameter
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"encode a nil"
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self encodeObject:nil with:aParameter
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!
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encodeObject:anObject with:aParameter
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"encode an object. Subclasses must implement this method"
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self subclassResponsibility
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!
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encodeSequencableCollection:aCollection with:aParameter
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"encode a SequencableCollection"
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self encodeObject:aCollection with:aParameter
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!
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encodeSet:aCollection with:aParameter
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"encode a Set"
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self encodeObject:aCollection with:aParameter
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!
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encodeString:aString with:aParameter
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"encode a String"
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self encodeObject:aString with:aParameter
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!
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encodeSymbol:aSymbol with:aParameter
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"encode a Symbol"
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self encodeObject:aSymbol with:aParameter
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! !
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!ObjectCoder methodsFor:'initialization'!
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close
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"close the underlying stream"
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stream notNil ifTrue:[
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stream close.
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].
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!
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reset
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"reset the coder"
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stream notNil ifTrue:[
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stream reset.
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].
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! !
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!ObjectCoder protectedMethodsFor:'private - accessing'!
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stream:aStream
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stream := aStream
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! !
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!ObjectCoder class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic/ObjectCoder.st,v 1.1 2000-07-21 20:03:50 stefan Exp $'
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! !
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