author | Claus Gittinger <cg@exept.de> |
Wed, 20 Mar 2013 12:27:53 +0100 | |
changeset 2948 | dc6efd25377b |
parent 2935 | d15b179aabfb |
child 2949 | bc40924d516b |
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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dc6efd25377b
class: SegmentedOrderedCollection
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parents:
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diff
changeset
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SegmentedOrderedCollections are intended as a replacement for huge OrderedCollections. |
dc6efd25377b
class: SegmentedOrderedCollection
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parents:
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diff
changeset
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They keep their elements in chunks (segments), allowing for fast |
dc6efd25377b
class: SegmentedOrderedCollection
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parents:
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diff
changeset
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adding/removing at either end AND relatively fast add/remove inside the collection. |
dc6efd25377b
class: SegmentedOrderedCollection
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parents:
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changeset
|
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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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parents:
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diff
changeset
|
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However, notice: when only removing at either end only, an OrderedCollection is much faster. |
2916 | 19 |
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class: SegmentedOrderedCollection
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parents:
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diff
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|
20 |
The break-even in performance depends on the number of elements and the usage pattern. |
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class: SegmentedOrderedCollection
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parents:
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diff
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|
21 |
Consider it with (say) > 10000 elements and many adds/removes from the inside. |
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class: SegmentedOrderedCollection
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Possibly unfinished (may need optimized search and replace). |
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25 |
[author:] |
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Claus Gittinger |
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28 |
[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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class: SegmentedOrderedCollection
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! |
dc6efd25377b
class: SegmentedOrderedCollection
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parents:
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class: SegmentedOrderedCollection
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parents:
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new:size |
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"return an initialized instance with space for size elements. |
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class: SegmentedOrderedCollection
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parents:
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However, be aware that the logical size is 0" |
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class: SegmentedOrderedCollection
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|
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class: SegmentedOrderedCollection
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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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|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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|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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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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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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139 |
tally := tally + 1. |
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^ anObject |
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]. |
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142 |
segStart := segEnd + 1. |
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prevSeg := seg. |
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144 |
]. |
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145 |
self error:'oops - should not be here' |
2916 | 146 |
! |
147 |
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148 |
addFirst:anObject |
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149 |
"add anObject to the beginning (insert as new first element)." |
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150 |
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151 |
|seg| |
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152 |
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153 |
(seg := segments first) size >= maxSegmentSize ifTrue:[ |
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self splitSegmentAt:1. |
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155 |
seg := segments first. |
|
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]. |
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seg addFirst:anObject. |
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tally := tally + 1. |
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159 |
! |
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160 |
||
161 |
removeFirst |
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162 |
|seg el| |
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163 |
||
164 |
tally == 0 ifTrue:[ |
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165 |
^ self emptyCollectionError |
|
166 |
]. |
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seg := segments first. |
|
168 |
el := seg removeFirst. |
|
169 |
seg isEmpty ifTrue:[ |
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170 |
segments removeFirst |
|
171 |
]. |
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172 |
tally := tally - 1. |
|
173 |
^ el |
|
174 |
! |
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175 |
||
176 |
removeFromIndex:startIndex toIndex:endIndex |
|
177 |
|segStart segEnd removing segIndex nextSegIndex seg| |
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178 |
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179 |
(startIndex between:1 and:tally) ifFalse:[ |
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180 |
^ self indexNotIntegerOrOutOfBounds:startIndex |
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]. |
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182 |
(endIndex between:1 and:tally) ifFalse:[ |
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183 |
^ self indexNotIntegerOrOutOfBounds:endIndex |
|
184 |
]. |
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185 |
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186 |
segStart := 1. |
|
187 |
segIndex := 1. |
|
188 |
removing := false. |
|
189 |
[true] whileTrue:[ |
|
190 |
seg := segments at:segIndex. |
|
191 |
nextSegIndex := segIndex + 1. |
|
192 |
||
193 |
segEnd := segStart + (seg size - 1). |
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194 |
||
195 |
removing ifFalse:[ |
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class: SegmentedOrderedCollection
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parents:
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diff
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196 |
"still searching for the segment" |
2916 | 197 |
(startIndex between:segStart and:segEnd) ifTrue:[ |
198 |
(endIndex between:segStart and:segEnd) ifTrue:[ |
|
199 |
seg removeFromIndex:(startIndex - segStart + 1) toIndex:(endIndex - segStart + 1). |
|
200 |
seg isEmpty ifTrue:[ |
|
201 |
segments removeAtIndex:segIndex. |
|
202 |
]. |
|
203 |
tally := tally - (endIndex - startIndex + 1). |
|
204 |
^ self. |
|
205 |
]. |
|
206 |
seg removeFromIndex:(startIndex - segStart + 1). |
|
207 |
seg isEmpty ifTrue:[ |
|
208 |
segments removeAtIndex:segIndex. |
|
209 |
nextSegIndex := segIndex. |
|
210 |
]. |
|
211 |
removing := true. |
|
212 |
]. |
|
213 |
] ifTrue:[ |
|
214 |
(endIndex between:segStart and:segEnd) ifTrue:[ |
|
215 |
seg removeFromIndex:1 toIndex:(endIndex - segStart + 1). |
|
216 |
seg isEmpty ifTrue:[ |
|
217 |
segments removeAtIndex:segIndex. |
|
218 |
]. |
|
219 |
tally := tally - (endIndex - startIndex + 1). |
|
220 |
^ self. |
|
221 |
] ifFalse:[ |
|
222 |
"/ remove the whole segment |
|
223 |
segments removeAtIndex:segIndex. |
|
224 |
nextSegIndex := segIndex. |
|
225 |
] |
|
226 |
]. |
|
227 |
segStart := segEnd + 1. |
|
228 |
segIndex := nextSegIndex. |
|
229 |
]. |
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230 |
self halt:'should not be here' |
|
231 |
! |
|
232 |
||
233 |
removeLast |
|
234 |
|seg el| |
|
235 |
||
236 |
tally == 0 ifTrue:[ |
|
237 |
^ self emptyCollectionError |
|
238 |
]. |
|
239 |
seg := segments last. |
|
240 |
el := seg removeLast. |
|
241 |
seg isEmpty ifTrue:[ |
|
242 |
segments removeLast |
|
243 |
]. |
|
244 |
tally := tally - 1. |
|
245 |
^ el |
|
246 |
! |
|
247 |
||
248 |
splitSegmentAt:segmentIndex |
|
249 |
|seg rightPart| |
|
250 |
||
251 |
seg := segments at:segmentIndex. |
|
252 |
||
253 |
rightPart := OrderedCollection new:20. |
|
254 |
rightPart grow:10. |
|
255 |
rightPart replaceFrom:1 to:10 with:seg startingAt:(seg size - 9). |
|
256 |
||
257 |
seg removeFromIndex:(seg size - 9) toIndex:seg size. |
|
258 |
||
259 |
segments add:rightPart afterIndex:segmentIndex. |
|
260 |
! ! |
|
261 |
||
262 |
!SegmentedOrderedCollection methodsFor:'enumerating'! |
|
263 |
||
264 |
do:aBlock |
|
265 |
segments do:[:seg | |
|
266 |
seg do:aBlock |
|
267 |
]. |
|
268 |
! |
|
269 |
||
270 |
keysAndValuesDo:aBlock |
|
271 |
|idx| |
|
272 |
||
273 |
idx := 1. |
|
274 |
segments do:[:seg | |
|
275 |
seg do:[:each | |
|
276 |
aBlock value:idx value:each. |
|
277 |
idx := idx + 1. |
|
278 |
] |
|
279 |
]. |
|
280 |
! ! |
|
281 |
||
2948
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
282 |
!SegmentedOrderedCollection methodsFor:'grow & shrink'! |
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class: SegmentedOrderedCollection
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parents:
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diff
changeset
|
283 |
|
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parents:
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diff
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|
284 |
grow:newSize |
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parents:
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|
285 |
"adjust the logical size to newSize" |
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parents:
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diff
changeset
|
286 |
|
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diff
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|
287 |
|numExtraSegments segStart segEnd segIndex seg| |
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parents:
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|
288 |
|
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parents:
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|
289 |
newSize == 0 ifTrue:[ |
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parents:
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diff
changeset
|
290 |
segments := OrderedCollection new:2. |
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parents:
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|
291 |
tally := 0. |
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|
292 |
^ self |
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parents:
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|
293 |
]. |
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parents:
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|
294 |
|
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parents:
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|
295 |
newSize < tally ifTrue:[ |
dc6efd25377b
class: SegmentedOrderedCollection
Claus Gittinger <cg@exept.de>
parents:
2935
diff
changeset
|
296 |
"/ shrinking |
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parents:
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|
297 |
segStart := 1. |
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parents:
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|
298 |
segIndex := 1. |
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parents:
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changeset
|
299 |
[true] whileTrue:[ |
dc6efd25377b
class: SegmentedOrderedCollection
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parents:
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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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^ self |
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]. |
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segStart := segEnd + 1. |
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segIndex := segIndex + 1. |
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]. |
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"/ not reached |
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]. |
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313 |
|
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"/ growing |
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numExtraSegments := (newSize - tally) // maxSegmentSize + 1. |
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numExtraSegments timesRepeat:[ |
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segments add:((OrderedCollection new:maxSegmentSize) grow:maxSegmentSize) |
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]. |
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tally := newSize |
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320 |
! ! |
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321 |
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2916 | 322 |
!SegmentedOrderedCollection methodsFor:'initialization'! |
323 |
||
324 |
initialize |
|
325 |
"Invoked when a new instance is created." |
|
326 |
||
327 |
segments := OrderedCollection with:(OrderedCollection new:10). |
|
328 |
maxSegmentSize := 200. |
|
329 |
tally := 0. |
|
330 |
! ! |
|
331 |
||
332 |
!SegmentedOrderedCollection methodsFor:'queries'! |
|
333 |
||
334 |
size |
|
335 |
^ tally |
|
336 |
! ! |
|
337 |
||
338 |
!SegmentedOrderedCollection class methodsFor:'documentation'! |
|
339 |
||
340 |
version |
|
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341 |
^ '$Header: /cvs/stx/stx/libbasic2/SegmentedOrderedCollection.st,v 1.3 2013-03-20 11:27:53 cg Exp $' |
2916 | 342 |
! |
343 |
||
344 |
version_CVS |
|
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^ '$Header: /cvs/stx/stx/libbasic2/SegmentedOrderedCollection.st,v 1.3 2013-03-20 11:27:53 cg Exp $' |
2916 | 346 |
! ! |
347 |