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"{ Encoding: utf8 }"
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5387
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"
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COPYRIGHT (c) 2018 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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4541
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"{ Package: 'stx:libbasic2' }"
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"{ NameSpace: Smalltalk }"
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Collection subclass:#VirtualDictionary
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instanceVariableNames:'fetchBlock'
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Unordered'
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!
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!VirtualDictionary class methodsFor:'documentation'!
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5387
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copyright
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"
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COPYRIGHT (c) 2018 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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a collection which looks like a (read-only) dictionary to the outside,
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but invokes a pluggable fetchBlock to retrieve keys.
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[author:]
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cg
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[instance variables:]
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[class variables:]
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[see also:]
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"
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! !
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!VirtualDictionary methodsFor:'accessing'!
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at:aKey
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^ self at:aKey ifAbsent:nil
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!
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at:aKey ifAbsent:exceptionValue
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|value|
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value := fetchBlock value:aKey.
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value isNil ifTrue:[
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^ exceptionValue value
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].
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^ value
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!
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fetchBlock:something
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fetchBlock := something.
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! !
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!VirtualDictionary methodsFor:'queries'!
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includesKey:aKey
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^ (fetchBlock value:aKey) notNil
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! !
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!VirtualDictionary class methodsFor:'documentation'!
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version
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^ '$Header$'
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!
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version_CVS
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^ '$Header$'
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! !
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