author | Jan Vrany <jan.vrany@fit.cvut.cz> |
Wed, 01 Feb 2012 08:54:33 +0000 | |
changeset 105 | ba761aff18ac |
parent 97 | 2a7827f4dce2 |
child 111 | 44ac233b2f83 |
permissions | -rw-r--r-- |
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"{ Package: 'stx:goodies/xtreams/transforms' }" |
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"{ NameSpace: Xtreams }" |
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WriteStream subclass:#CollectWriteStream |
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instanceVariableNames:'block cache' |
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classVariableNames:'' |
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poolDictionaries:'Xtreams::XtreamsPool' |
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2cc5a8a3ca14
added XtreamsPool to fix DefaultBufferSize; set proper category names
mkobetic
parents:
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diff
changeset
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category:'Xtreams-Transforms' |
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CollectWriteStream comment:'Converts written elements using the provided conversion block. Optimizes bulk writes by batching the conversion results, allowing the destination stream to perform bulk writes as well. |
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Instance Variables |
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block <BlockClosure> collecting block (same style as collect: blocks) |
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cache <SequenceableCollection> caches results after transformation so that they can be bulk written too |
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' |
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!CollectWriteStream class methodsFor:'instance creation'! |
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on: aWriteStream block: block |
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^self new on: aWriteStream block: block |
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! ! |
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!CollectWriteStream methodsFor:'accessing'! |
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block |
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^block |
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! |
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insert: anInteger from: aSequenceableCollection at: startIndex |
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| count amount written offset | |
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count := 0. |
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offset := startIndex. |
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[count < anInteger] whileTrue: |
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[amount := anInteger min: cache size. |
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1 to: amount do: [:index | cache at: index put: (block value: (aSequenceableCollection at: offset+index))]. |
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written := [destination insert: anInteger from: cache. amount] on: Incomplete do: [ :ex | ex count ]. |
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count := count + written. |
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written < amount ifTrue: [(Incomplete on: aSequenceableCollection count: count at: startIndex) raise]. |
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offset := offset + amount ]. |
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^anInteger |
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! |
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put: anObject |
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destination put: (block value: anObject). |
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^anObject |
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! |
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write: anInteger from: aSequenceableCollection at: startIndex |
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| count amount written offset | |
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count := 0. |
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offset := startIndex - 1. |
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[count < anInteger] whileTrue: |
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[amount := anInteger - count min: cache size. |
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1 to: amount do: [:index | cache at: index put: (block value: (aSequenceableCollection at: offset + index))]. |
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written := [destination write: amount from: cache. amount] on: Incomplete do: [ :ex | ex count ]. |
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count := count + written. |
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written < amount ifTrue: [(Incomplete on: aSequenceableCollection count: count at: startIndex) raise]. |
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offset := offset + amount ]. |
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^anInteger |
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! ! |
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!CollectWriteStream methodsFor:'initialize-release'! |
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close |
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super close. |
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cache recycle. |
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cache := nil |
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! |
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contentsSpecies |
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^cache species |
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! |
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contentsSpecies: aClass |
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cache ifNotNil: [ cache recycle ]. |
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cache := aClass newRecycled: ( |
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(cache notNil and: [ cache size > 0 ]) |
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ifTrue: [cache size] |
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ifFalse: [DefaultBufferSize]) |
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on: aDestination block: aBlock |
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self on: aDestination. |
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block := aBlock. |
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self contentsSpecies: aDestination contentsSpecies |
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! ! |
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!CollectWriteStream methodsFor:'seeking'! |
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++ anInteger |
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^destination ++ anInteger |
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-- anInteger |
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^destination -- anInteger |
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length |
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^destination length |
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position |
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^destination position |
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position: anInteger |
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^destination position: anInteger |
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! ! |
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!CollectWriteStream methodsFor:'testing'! |
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isPositionable |
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^destination isPositionable |
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! ! |
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!CollectWriteStream class methodsFor:'documentation'! |
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version_SVN |
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^ '$Id$' |
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! ! |