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'From Smalltalk/X, Version:2.10.5 on 26-mar-1995 at 4:21:12 am'!
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Model subclass:#Plug
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instanceVariableNames:'simulatedProtocol'
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classVariableNames:''
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poolDictionaries:''
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category:'Kernel-Objects'
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!
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!Plug class methodsFor:'documentation'!
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version
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"
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$Header: /cvs/stx/stx/libview2/Plug.st,v 1.2 1995-03-26 20:10:27 claus Exp $
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"
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!
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documentation
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"
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A Plug is an objcet which simulates a protocol and evaluates
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a corresponding block when receiving messages.
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Its main use is for the demo doIts, to play the role of a model.
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Plugs are not used in the system and exist as a demo only.
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This class may be changed/removed/replaced without notice.
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"
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!
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examples
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"
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|plug|
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plug := Plug new.
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plug respondTo:#foo with:[Transcript showCr:'received foo'].
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plug respondTo:#foo: with:[:arg | Transcript showCr:'received foo: ', arg printString].
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plug foo.
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plug foo:'some argument'
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"
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! !
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!Plug class methodsFor:'instance creation'!
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new
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^ super basicNew privateInitialize
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! !
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!Plug methodsFor:'message sending'!
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doesNotUnderstand:aMessage
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|block|
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block := simulatedProtocol at:aMessage selector ifAbsent:[].
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block isNil ifTrue:[
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^ super doesNotUnderstand:aMessage
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].
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^ block valueWithArguments:(aMessage arguments)
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! !
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!Plug methodsFor:'protocol definition'!
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respondTo:aSelector with:aBlock
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simulatedProtocol at:aSelector put:aBlock
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! !
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!Plug methodsFor:'initialization'!
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privateInitialize
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"this method is NOT called initialize to allow plugging that
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selector ..."
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simulatedProtocol := IdentityDictionary new.
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! !
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