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"
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COPYRIGHT (c) 2003 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: 'stx:libbasic2' }"
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"{ NameSpace: Smalltalk }"
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CacheDictionary subclass:#CacheDictionaryWithFactory
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instanceVariableNames:'factoryBlock'
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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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!CacheDictionaryWithFactory class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2003 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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like a Dictionary, but does not grow (i.e. only keeps size items),
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and also keeps a factoryBlock to automatically compute missing elements.
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[author:]
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Claus Gittinger (cg@alan)
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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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examples
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"
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caches reverse strings (stupid usage)
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[exBegin]
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|c|
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c := CacheDictionaryWithFactory
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new:100 factory:[:key | key reversed].
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c at:'hello'.
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c at:'hello'.
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1 to:1000 do:[:i | c at:i printString].
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c at:'hello'.
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[exEnd]
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Test: should halt (compute 'hello') only twice.
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[exBegin]
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|c numHalts|
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numHalts := 0.
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c := CacheDictionaryWithFactory
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new:100 factory:[:key | key = 'hello' ifTrue:[numHalts := numHalts + 1]. key reversed].
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c at:'hello'.
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c at:'hello'.
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1 to:1000 do:[:i | c at:i printString].
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c at:'hello'.
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self assert:( numHalts == 2 ).
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[exEnd]
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"
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! !
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!CacheDictionaryWithFactory class methodsFor:'instance creation'!
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new:cacheSize factory:aBlock
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^ (self new:cacheSize) factory:aBlock
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! !
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!CacheDictionaryWithFactory methodsFor:'accessing'!
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at:key
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^ super at:key ifAbsentPut:[factoryBlock value:key]
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! !
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!CacheDictionaryWithFactory methodsFor:'initialization'!
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factory:aBlock
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factoryBlock := aBlock
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! !
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!CacheDictionaryWithFactory class methodsFor:'documentation'!
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version
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^ '$Header$'
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! !
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