author | Claus Gittinger <cg@exept.de> |
Sat, 26 Jul 2014 10:13:10 +0200 | |
changeset 3328 | deaef41ffd6f |
parent 3327 | 5b988100c53a |
child 3671 | 5f82bb564a67 |
permissions | -rw-r--r-- |
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"{ Package: 'stx:libbasic2' }" |
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SequenceableCollection subclass:#SegmentedOrderedCollection |
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instanceVariableNames:'segments maxSegmentSize tally' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Collections-Sequenceable' |
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! |
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!SegmentedOrderedCollection class methodsFor:'documentation'! |
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documentation |
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" |
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SegmentedOrderedCollections are intended as a replacement for huge OrderedCollections or Lists. |
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They keep their elements in chunks (segments), allowing for fast |
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adding/removing at either end AND relatively fast add/remove inside the collection. |
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For huge collections, the performance is much better when adding/removing inner elements. |
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class: SegmentedOrderedCollection
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However, notice: when only removing at either end only, an OrderedCollection is faster. |
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The break-even in performance depends on the number of elements and the usage pattern. |
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Consider it with (say) > 10000 elements and many adds/removes from the inside. |
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class: SegmentedOrderedCollection
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This class was added to support huge selection-in-lists (>100k elements), which are |
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constantly changing by adding/removing elements at arbitrary positions. |
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Possibly unfinished (may need optimized search and replace). |
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[author:] |
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Claus Gittinger |
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[see also:] |
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Array OrderedCollection BTree |
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" |
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! ! |
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!SegmentedOrderedCollection class methodsFor:'instance creation'! |
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new |
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"return an initialized instance" |
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^ self basicNew initialize. |
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! |
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new:size |
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"return an initialized instance with space for size elements. |
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However, be aware that the logical size is 0" |
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^ self basicNew initialize. |
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! ! |
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!SegmentedOrderedCollection methodsFor:'accessing'! |
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at:index |
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"return the element at index, anInteger" |
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|segStart segEnd| |
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(index between:1 and:tally) ifFalse:[ |
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^ self indexNotIntegerOrOutOfBounds:index |
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]. |
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segStart := 1. |
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segments do:[:seg | |
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segEnd := segStart + (seg size - 1). |
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(index between:segStart and:segEnd) ifTrue:[ |
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^ seg at:(index - segStart + 1). |
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]. |
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segStart := segEnd + 1. |
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]. |
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self error:'oops - should not be here' |
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! |
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at:index put:newElement |
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"set the element at index, to be anInteger. |
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Return anObject (sigh)." |
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|segStart segEnd| |
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(index between:1 and:tally) ifFalse:[ |
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^ self indexNotIntegerOrOutOfBounds:index |
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]. |
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segStart := 1. |
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segments do:[:seg | |
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segEnd := segStart + (seg size - 1). |
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(index between:segStart and:segEnd) ifTrue:[ |
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^ seg at:(index - segStart + 1) put:newElement. |
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]. |
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segStart := segEnd + 1. |
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]. |
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self error:'oops - should not be here' |
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! |
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first |
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"return the first element" |
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tally == 0 ifTrue:[^ self emptyCollectionError]. |
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^ segments first first |
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! |
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last |
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"return the last element" |
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tally == 0 ifTrue:[^ self emptyCollectionError]. |
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^ segments last last |
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! ! |
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!SegmentedOrderedCollection methodsFor:'adding & removing'! |
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add:anObject |
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"add anObject to the end. |
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Returns the object (sigh)" |
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|seg| |
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(seg := segments last) size >= maxSegmentSize ifTrue:[ |
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self splitSegmentAt:(segments size). |
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seg := segments last. |
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]. |
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seg add:anObject. |
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tally := tally + 1. |
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self changed:#insert: with:tally. |
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^ anObject. |
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! |
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add:anObject beforeIndex:index |
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"insert the first argument, anObject into the collection before slot index. |
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Return the receiver (sigh - ST-80 compatibility). |
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Notice, that this is modifies the receiver NOT a copy." |
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|prevSeg segStart| |
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index == (tally+1) ifTrue:[ |
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^ self add:anObject |
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]. |
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segStart := 1. |
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segments do:[:seg | |
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|segEnd| |
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segEnd := segStart + (seg size - 1). |
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(index between:segStart and:segEnd) ifTrue:[ |
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index == segStart ifTrue:[ |
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prevSeg notNil ifTrue:[ |
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prevSeg size < seg size ifTrue:[ |
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prevSeg add:anObject. |
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tally := tally + 1. |
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^ anObject |
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]. |
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]. |
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]. |
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seg add:anObject beforeIndex:(index - segStart + 1). |
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tally := tally + 1. |
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self changed:#insert: with:index. |
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^ anObject |
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]. |
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segStart := segEnd + 1. |
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prevSeg := seg. |
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]. |
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self error:'oops - should not be here' |
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! |
162 |
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163 |
addFirst:anObject |
|
164 |
"add anObject to the beginning (insert as new first element)." |
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165 |
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166 |
|seg| |
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167 |
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168 |
(seg := segments first) size >= maxSegmentSize ifTrue:[ |
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169 |
self splitSegmentAt:1. |
|
170 |
seg := segments first. |
|
171 |
]. |
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172 |
seg addFirst:anObject. |
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173 |
tally := tally + 1. |
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self changed:#insert: with:1 |
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! |
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||
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removeAll |
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"remove all elements from the receiver. Returns the receiver." |
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|prevSize| |
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prevSize := tally. |
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183 |
segments := OrderedCollection with:(OrderedCollection new). |
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tally := 0. |
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185 |
self changed:#removeFrom: with:(Array with:1 with:prevSize) |
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188 |
"Modified: / 30-07-2013 / 19:31:05 / cg" |
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189 |
! |
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190 |
|
2916 | 191 |
removeFirst |
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192 |
"remove the first element from the collection; return the element. |
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193 |
If there is no element in the receiver collection, raise an error." |
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194 |
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195 |
^ self removeFirstIfAbsent:[self emptyCollectionError] |
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196 |
! |
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197 |
|
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198 |
removeFirstIfAbsent:exceptionBlock |
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199 |
"remove the first element from the collection; return the element. |
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200 |
If there is no element in the receiver collection, return the value from |
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201 |
exceptionBlock. |
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202 |
Destructive: modifies the receiver" |
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203 |
|
2916 | 204 |
|seg el| |
205 |
||
206 |
tally == 0 ifTrue:[ |
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207 |
^ exceptionBlock value |
2916 | 208 |
]. |
209 |
seg := segments first. |
|
210 |
el := seg removeFirst. |
|
211 |
seg isEmpty ifTrue:[ |
|
212 |
segments removeFirst |
|
213 |
]. |
|
214 |
tally := tally - 1. |
|
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|
215 |
self changed:#remove: with:1. |
2916 | 216 |
^ el |
217 |
! |
|
218 |
||
219 |
removeFromIndex:startIndex toIndex:endIndex |
|
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|
220 |
"remove the elements stored under startIndex up to and including |
bc40924d516b
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Claus Gittinger <cg@exept.de>
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|
221 |
the elements under stopIndex. |
bc40924d516b
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|
222 |
Return the receiver. |
bc40924d516b
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|
223 |
Returning the receiver here is a historic leftover - it may change. |
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|
224 |
Please use yourself in a cascade, if you need the receiver's value |
bc40924d516b
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|
225 |
when using this method." |
bc40924d516b
class: SegmentedOrderedCollection
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parents:
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diff
changeset
|
226 |
|
2916 | 227 |
|segStart segEnd removing segIndex nextSegIndex seg| |
228 |
||
229 |
(startIndex between:1 and:tally) ifFalse:[ |
|
230 |
^ self indexNotIntegerOrOutOfBounds:startIndex |
|
231 |
]. |
|
232 |
(endIndex between:1 and:tally) ifFalse:[ |
|
233 |
^ self indexNotIntegerOrOutOfBounds:endIndex |
|
234 |
]. |
|
235 |
||
236 |
segStart := 1. |
|
237 |
segIndex := 1. |
|
238 |
removing := false. |
|
3211 | 239 |
[ |
2916 | 240 |
seg := segments at:segIndex. |
241 |
nextSegIndex := segIndex + 1. |
|
242 |
||
243 |
segEnd := segStart + (seg size - 1). |
|
244 |
||
245 |
removing ifFalse:[ |
|
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d15b179aabfb
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diff
changeset
|
246 |
"still searching for the segment" |
2916 | 247 |
(startIndex between:segStart and:segEnd) ifTrue:[ |
248 |
(endIndex between:segStart and:segEnd) ifTrue:[ |
|
249 |
seg removeFromIndex:(startIndex - segStart + 1) toIndex:(endIndex - segStart + 1). |
|
250 |
seg isEmpty ifTrue:[ |
|
251 |
segments removeAtIndex:segIndex. |
|
252 |
]. |
|
253 |
tally := tally - (endIndex - startIndex + 1). |
|
3328
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diff
changeset
|
254 |
self changed:#removeFrom: with:(Array with:startIndex with:endIndex). |
2916 | 255 |
^ self. |
256 |
]. |
|
257 |
seg removeFromIndex:(startIndex - segStart + 1). |
|
258 |
seg isEmpty ifTrue:[ |
|
259 |
segments removeAtIndex:segIndex. |
|
260 |
nextSegIndex := segIndex. |
|
261 |
]. |
|
262 |
removing := true. |
|
263 |
]. |
|
264 |
] ifTrue:[ |
|
265 |
(endIndex between:segStart and:segEnd) ifTrue:[ |
|
266 |
seg removeFromIndex:1 toIndex:(endIndex - segStart + 1). |
|
267 |
seg isEmpty ifTrue:[ |
|
268 |
segments removeAtIndex:segIndex. |
|
269 |
]. |
|
270 |
tally := tally - (endIndex - startIndex + 1). |
|
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|
271 |
self changed:#removeFrom: with:(Array with:startIndex with:endIndex). |
2916 | 272 |
^ self. |
273 |
] ifFalse:[ |
|
274 |
"/ remove the whole segment |
|
275 |
segments removeAtIndex:segIndex. |
|
276 |
nextSegIndex := segIndex. |
|
277 |
] |
|
278 |
]. |
|
279 |
segStart := segEnd + 1. |
|
280 |
segIndex := nextSegIndex. |
|
3211 | 281 |
] loop. |
2916 | 282 |
! |
283 |
||
284 |
removeLast |
|
2949
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|
285 |
"remove the last element from the collection; return the element" |
bc40924d516b
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diff
changeset
|
286 |
|
2916 | 287 |
|seg el| |
288 |
||
289 |
tally == 0 ifTrue:[ |
|
290 |
^ self emptyCollectionError |
|
291 |
]. |
|
292 |
seg := segments last. |
|
293 |
el := seg removeLast. |
|
294 |
seg isEmpty ifTrue:[ |
|
295 |
segments removeLast |
|
296 |
]. |
|
297 |
tally := tally - 1. |
|
3328
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changeset
|
298 |
self changed:#remove: with:(1 + tally). |
2916 | 299 |
^ el |
300 |
! ! |
|
301 |
||
302 |
!SegmentedOrderedCollection methodsFor:'enumerating'! |
|
303 |
||
304 |
do:aBlock |
|
2949
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
305 |
"evaluate the argument, aBlock for every element in the collection." |
bc40924d516b
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diff
changeset
|
306 |
|
2916 | 307 |
segments do:[:seg | |
308 |
seg do:aBlock |
|
309 |
]. |
|
310 |
! |
|
311 |
||
312 |
keysAndValuesDo:aBlock |
|
2949
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
313 |
"evaluate the argument, aBlock for every element in the collection, |
bc40924d516b
class: SegmentedOrderedCollection
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parents:
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diff
changeset
|
314 |
passing both index and element as arguments." |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
315 |
|
2916 | 316 |
|idx| |
317 |
||
318 |
idx := 1. |
|
319 |
segments do:[:seg | |
|
320 |
seg do:[:each | |
|
321 |
aBlock value:idx value:each. |
|
322 |
idx := idx + 1. |
|
323 |
] |
|
324 |
]. |
|
325 |
! ! |
|
326 |
||
2948
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
327 |
!SegmentedOrderedCollection methodsFor:'grow & shrink'! |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
328 |
|
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
329 |
grow:newSize |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
330 |
"adjust the logical size to newSize" |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
331 |
|
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
332 |
|numExtraSegments segStart segEnd segIndex seg| |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
333 |
|
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
334 |
newSize == 0 ifTrue:[ |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
335 |
segments := OrderedCollection new:2. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
336 |
tally := 0. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
337 |
^ self |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
338 |
]. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
339 |
|
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
340 |
newSize < tally ifTrue:[ |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
341 |
"/ shrinking |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
342 |
segStart := 1. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
343 |
segIndex := 1. |
3211 | 344 |
[ |
2948
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
345 |
seg := segments at:segIndex. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
346 |
segEnd := segStart + (seg size - 1). |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
347 |
(newSize between:segStart and:segEnd) ifTrue:[ |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
348 |
(segments at:segIndex) removeFromIndex:(newSize - segStart + 1 + 1). |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
349 |
segments removeFromIndex:segIndex+1. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
350 |
tally := newSize. |
3327
5b988100c53a
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3267
diff
changeset
|
351 |
segments isEmpty ifTrue:[ |
5b988100c53a
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3267
diff
changeset
|
352 |
segments := OrderedCollection with:(OrderedCollection new). |
5b988100c53a
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3267
diff
changeset
|
353 |
]. |
2948
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
354 |
^ self |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
355 |
]. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
356 |
segStart := segEnd + 1. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
357 |
segIndex := segIndex + 1. |
3211 | 358 |
] loop. |
2948
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
359 |
"/ not reached |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
360 |
]. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
361 |
|
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
362 |
"/ growing |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
363 |
numExtraSegments := (newSize - tally) // maxSegmentSize + 1. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
364 |
numExtraSegments timesRepeat:[ |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
365 |
segments add:((OrderedCollection new:maxSegmentSize) grow:maxSegmentSize) |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
366 |
]. |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
367 |
tally := newSize |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
368 |
! ! |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
369 |
|
2916 | 370 |
!SegmentedOrderedCollection methodsFor:'initialization'! |
371 |
||
372 |
initialize |
|
373 |
"Invoked when a new instance is created." |
|
374 |
||
3066
5ec162bc812d
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3056
diff
changeset
|
375 |
segments := OrderedCollection with:(OrderedCollection new). |
2916 | 376 |
maxSegmentSize := 200. |
377 |
tally := 0. |
|
3066
5ec162bc812d
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3056
diff
changeset
|
378 |
|
5ec162bc812d
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3056
diff
changeset
|
379 |
"Modified: / 30-07-2013 / 19:31:12 / cg" |
2916 | 380 |
! ! |
381 |
||
2949
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
382 |
!SegmentedOrderedCollection methodsFor:'private'! |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
383 |
|
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
384 |
splitSegmentAt:segmentIndex |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
385 |
|seg rightPart| |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
386 |
|
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
387 |
seg := segments at:segmentIndex. |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
388 |
|
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
389 |
rightPart := OrderedCollection new:20. |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
390 |
rightPart grow:10. |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
391 |
rightPart replaceFrom:1 to:10 with:seg startingAt:(seg size - 9). |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
392 |
|
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
393 |
seg removeFromIndex:(seg size - 9) toIndex:seg size. |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
394 |
|
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
395 |
segments add:rightPart afterIndex:segmentIndex. |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
396 |
! ! |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
397 |
|
2916 | 398 |
!SegmentedOrderedCollection methodsFor:'queries'! |
399 |
||
3014 | 400 |
isFixedSize |
401 |
"return true if the receiver cannot grow" |
|
402 |
||
403 |
^ false |
|
404 |
! |
|
405 |
||
2916 | 406 |
size |
2949
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
407 |
"return the number of elements in the collection" |
bc40924d516b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2948
diff
changeset
|
408 |
|
2916 | 409 |
^ tally |
410 |
! ! |
|
411 |
||
412 |
!SegmentedOrderedCollection class methodsFor:'documentation'! |
|
413 |
||
414 |
version |
|
3328
deaef41ffd6f
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3327
diff
changeset
|
415 |
^ '$Header: /cvs/stx/stx/libbasic2/SegmentedOrderedCollection.st,v 1.11 2014-07-26 08:13:10 cg Exp $' |
2916 | 416 |
! |
417 |
||
418 |
version_CVS |
|
3328
deaef41ffd6f
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
3327
diff
changeset
|
419 |
^ '$Header: /cvs/stx/stx/libbasic2/SegmentedOrderedCollection.st,v 1.11 2014-07-26 08:13:10 cg Exp $' |
2916 | 420 |
! ! |
421 |