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"{ Encoding: utf8 }"
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2906
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"
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COPYRIGHT (c) 2012 by Claus Gittinger
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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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2714
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"{ Package: 'stx:libbasic2' }"
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3479
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"{ NameSpace: Smalltalk }"
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SequenceableCollection subclass:#VirtualArray
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instanceVariableNames:'generator size'
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Arrayed'
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!
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!VirtualArray class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2012 by Claus Gittinger
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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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An Array which computes its values on demand and does NOT remember those values.
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Use this to present huge files/hex dumps to a text editor.
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[author:]
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Claus Gittinger
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[see also:]
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LazyArray
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"
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!
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examples
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"
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[exBegin]
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|squaresLines|
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squaresLines := VirtualArray new.
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squaresLines generator:[:index | index squared printString].
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squaresLines setSize:100000.
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squaresLines inspect.
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TextView openWith:squaresLines
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[exEnd]
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"
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! !
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!VirtualArray methodsFor:'accessing'!
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generator
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"the element value generator; a block which gets the index as argument"
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^ generator
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!
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generator:aBlock
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"set the element value generator; a block which gets the index as argument"
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generator := aBlock.
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!
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setSize:anInteger
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size := anInteger.
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!
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size
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"the virtual size"
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^ size
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! !
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!VirtualArray methodsFor:'collection protocol'!
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at:index
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^ generator value:index
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"Created: / 27-02-2012 / 20:40:03 / cg"
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!
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at:index put:value
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self noModificationError.
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"Created: / 27-02-2012 / 20:40:33 / cg"
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3326
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!
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grow:howBig
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"change the receiver's size"
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self setSize:howBig
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! !
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!VirtualArray methodsFor:'inspecting'!
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displayOn:aGCOrStream
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"print a representation of the receiver on aGCOrStream for display in inspectors etc."
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"/ what a kludge - Dolphin and Squeak mean: printOn: a stream;
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"/ ST/X (and some old ST80's) mean: draw-yourself on a GC.
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3324
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(aGCOrStream isStream) ifFalse:[
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^ super displayOn:aGCOrStream
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].
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aGCOrStream nextPutAll:('VirtualArray(size=%1, generator=%2)'
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bindWith:size with:generator printString).
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! !
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3479
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!VirtualArray methodsFor:'queries'!
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species
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"return something collect can work with"
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^ OrderedCollection
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! !
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!VirtualArray 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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2906
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