author | Claus Gittinger <cg@exept.de> |
Tue, 25 Jun 2013 13:23:35 +0200 | |
changeset 3014 | d9e664b6d2c7 |
parent 2949 | bc40924d516b |
child 3056 | fef823bb10e4 |
permissions | -rw-r--r-- |
2916 | 1 |
"{ 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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class: SegmentedOrderedCollection
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SegmentedOrderedCollections are intended as a replacement for huge OrderedCollections. |
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class: SegmentedOrderedCollection
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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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However, notice: when only removing at either end only, an OrderedCollection is much 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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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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^ 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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|
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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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^ 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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154 |
self error:'oops - should not be here' |
2916 | 155 |
! |
156 |
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157 |
addFirst:anObject |
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158 |
"add anObject to the beginning (insert as new first element)." |
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159 |
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|seg| |
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161 |
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162 |
(seg := segments first) size >= maxSegmentSize ifTrue:[ |
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163 |
self splitSegmentAt:1. |
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164 |
seg := segments first. |
|
165 |
]. |
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166 |
seg addFirst:anObject. |
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167 |
tally := tally + 1. |
|
168 |
! |
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169 |
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170 |
removeFirst |
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"remove the first element from the collection; return the element. |
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If there is no element in the receiver collection, raise an error." |
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|seg el| |
175 |
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176 |
tally == 0 ifTrue:[ |
|
177 |
^ self emptyCollectionError |
|
178 |
]. |
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179 |
seg := segments first. |
|
180 |
el := seg removeFirst. |
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181 |
seg isEmpty ifTrue:[ |
|
182 |
segments removeFirst |
|
183 |
]. |
|
184 |
tally := tally - 1. |
|
185 |
^ el |
|
186 |
! |
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187 |
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188 |
removeFromIndex:startIndex toIndex:endIndex |
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"remove the elements stored under startIndex up to and including |
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the elements under stopIndex. |
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191 |
Return the receiver. |
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Returning the receiver here is a historic leftover - it may change. |
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193 |
Please use yourself in a cascade, if you need the receiver's value |
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when using this method." |
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|segStart segEnd removing segIndex nextSegIndex seg| |
197 |
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198 |
(startIndex between:1 and:tally) ifFalse:[ |
|
199 |
^ self indexNotIntegerOrOutOfBounds:startIndex |
|
200 |
]. |
|
201 |
(endIndex between:1 and:tally) ifFalse:[ |
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202 |
^ self indexNotIntegerOrOutOfBounds:endIndex |
|
203 |
]. |
|
204 |
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205 |
segStart := 1. |
|
206 |
segIndex := 1. |
|
207 |
removing := false. |
|
208 |
[true] whileTrue:[ |
|
209 |
seg := segments at:segIndex. |
|
210 |
nextSegIndex := segIndex + 1. |
|
211 |
||
212 |
segEnd := segStart + (seg size - 1). |
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213 |
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214 |
removing ifFalse:[ |
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215 |
"still searching for the segment" |
2916 | 216 |
(startIndex between:segStart and:segEnd) ifTrue:[ |
217 |
(endIndex between:segStart and:segEnd) ifTrue:[ |
|
218 |
seg removeFromIndex:(startIndex - segStart + 1) toIndex:(endIndex - segStart + 1). |
|
219 |
seg isEmpty ifTrue:[ |
|
220 |
segments removeAtIndex:segIndex. |
|
221 |
]. |
|
222 |
tally := tally - (endIndex - startIndex + 1). |
|
223 |
^ self. |
|
224 |
]. |
|
225 |
seg removeFromIndex:(startIndex - segStart + 1). |
|
226 |
seg isEmpty ifTrue:[ |
|
227 |
segments removeAtIndex:segIndex. |
|
228 |
nextSegIndex := segIndex. |
|
229 |
]. |
|
230 |
removing := true. |
|
231 |
]. |
|
232 |
] ifTrue:[ |
|
233 |
(endIndex between:segStart and:segEnd) ifTrue:[ |
|
234 |
seg removeFromIndex:1 toIndex:(endIndex - segStart + 1). |
|
235 |
seg isEmpty ifTrue:[ |
|
236 |
segments removeAtIndex:segIndex. |
|
237 |
]. |
|
238 |
tally := tally - (endIndex - startIndex + 1). |
|
239 |
^ self. |
|
240 |
] ifFalse:[ |
|
241 |
"/ remove the whole segment |
|
242 |
segments removeAtIndex:segIndex. |
|
243 |
nextSegIndex := segIndex. |
|
244 |
] |
|
245 |
]. |
|
246 |
segStart := segEnd + 1. |
|
247 |
segIndex := nextSegIndex. |
|
248 |
]. |
|
249 |
self halt:'should not be here' |
|
250 |
! |
|
251 |
||
252 |
removeLast |
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253 |
"remove the last element from the collection; return the element" |
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254 |
|
2916 | 255 |
|seg el| |
256 |
||
257 |
tally == 0 ifTrue:[ |
|
258 |
^ self emptyCollectionError |
|
259 |
]. |
|
260 |
seg := segments last. |
|
261 |
el := seg removeLast. |
|
262 |
seg isEmpty ifTrue:[ |
|
263 |
segments removeLast |
|
264 |
]. |
|
265 |
tally := tally - 1. |
|
266 |
^ el |
|
267 |
! ! |
|
268 |
||
269 |
!SegmentedOrderedCollection methodsFor:'enumerating'! |
|
270 |
||
271 |
do:aBlock |
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272 |
"evaluate the argument, aBlock for every element in the collection." |
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273 |
|
2916 | 274 |
segments do:[:seg | |
275 |
seg do:aBlock |
|
276 |
]. |
|
277 |
! |
|
278 |
||
279 |
keysAndValuesDo:aBlock |
|
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"evaluate the argument, aBlock for every element in the collection, |
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passing both index and element as arguments." |
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282 |
|
2916 | 283 |
|idx| |
284 |
||
285 |
idx := 1. |
|
286 |
segments do:[:seg | |
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287 |
seg do:[:each | |
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288 |
aBlock value:idx value:each. |
|
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idx := idx + 1. |
|
290 |
] |
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291 |
]. |
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292 |
! ! |
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293 |
||
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!SegmentedOrderedCollection methodsFor:'grow & shrink'! |
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295 |
|
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grow:newSize |
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"adjust the logical size to newSize" |
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298 |
|
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299 |
|numExtraSegments segStart segEnd segIndex seg| |
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300 |
|
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newSize == 0 ifTrue:[ |
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segments := OrderedCollection new:2. |
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tally := 0. |
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^ self |
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]. |
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306 |
|
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newSize < tally ifTrue:[ |
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"/ shrinking |
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segStart := 1. |
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segIndex := 1. |
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[true] whileTrue:[ |
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seg := segments at:segIndex. |
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segEnd := segStart + (seg size - 1). |
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(newSize between:segStart and:segEnd) ifTrue:[ |
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(segments at:segIndex) removeFromIndex:(newSize - segStart + 1 + 1). |
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segments removeFromIndex:segIndex+1. |
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tally := newSize. |
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318 |
^ self |
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319 |
]. |
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320 |
segStart := segEnd + 1. |
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321 |
segIndex := segIndex + 1. |
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322 |
]. |
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323 |
"/ not reached |
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324 |
]. |
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325 |
|
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326 |
"/ growing |
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327 |
numExtraSegments := (newSize - tally) // maxSegmentSize + 1. |
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328 |
numExtraSegments timesRepeat:[ |
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329 |
segments add:((OrderedCollection new:maxSegmentSize) grow:maxSegmentSize) |
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330 |
]. |
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|
331 |
tally := newSize |
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|
332 |
! ! |
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333 |
|
2916 | 334 |
!SegmentedOrderedCollection methodsFor:'initialization'! |
335 |
||
336 |
initialize |
|
337 |
"Invoked when a new instance is created." |
|
338 |
||
339 |
segments := OrderedCollection with:(OrderedCollection new:10). |
|
340 |
maxSegmentSize := 200. |
|
341 |
tally := 0. |
|
342 |
! ! |
|
343 |
||
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|
344 |
!SegmentedOrderedCollection methodsFor:'private'! |
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|
345 |
|
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|
346 |
splitSegmentAt:segmentIndex |
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|
347 |
|seg rightPart| |
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|
348 |
|
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349 |
seg := segments at:segmentIndex. |
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|
350 |
|
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|
351 |
rightPart := OrderedCollection new:20. |
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|
352 |
rightPart grow:10. |
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|
353 |
rightPart replaceFrom:1 to:10 with:seg startingAt:(seg size - 9). |
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|
354 |
|
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|
355 |
seg removeFromIndex:(seg size - 9) toIndex:seg size. |
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|
356 |
|
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|
357 |
segments add:rightPart afterIndex:segmentIndex. |
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|
358 |
! ! |
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changeset
|
359 |
|
2916 | 360 |
!SegmentedOrderedCollection methodsFor:'queries'! |
361 |
||
3014 | 362 |
isFixedSize |
363 |
"return true if the receiver cannot grow" |
|
364 |
||
365 |
^ false |
|
366 |
! |
|
367 |
||
2916 | 368 |
size |
2949
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|
369 |
"return the number of elements in the collection" |
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changeset
|
370 |
|
2916 | 371 |
^ tally |
372 |
! ! |
|
373 |
||
374 |
!SegmentedOrderedCollection class methodsFor:'documentation'! |
|
375 |
||
376 |
version |
|
3014 | 377 |
^ '$Header: /cvs/stx/stx/libbasic2/SegmentedOrderedCollection.st,v 1.5 2013-06-25 11:23:35 cg Exp $' |
2916 | 378 |
! |
379 |
||
380 |
version_CVS |
|
3014 | 381 |
^ '$Header: /cvs/stx/stx/libbasic2/SegmentedOrderedCollection.st,v 1.5 2013-06-25 11:23:35 cg Exp $' |
2916 | 382 |
! ! |
383 |