.
"
COPYRIGHT (c) 1993 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
OrderedCollection subclass:#SortedCollection
instanceVariableNames:'sortBlock'
classVariableNames:'DefaultSortBlock'
poolDictionaries:''
category:'Collections-Sequenceable'
!
SortedCollection comment:'
COPYRIGHT (c) 1993 by Claus Gittinger
All Rights Reserved
$Header: /cvs/stx/stx/libbasic/Attic/SortColl.st,v 1.17 1995-05-18 15:10:23 claus Exp $
'!
!SortedCollection class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1993 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
version
"
$Header: /cvs/stx/stx/libbasic/Attic/SortColl.st,v 1.17 1995-05-18 15:10:23 claus Exp $
"
!
documentation
"
I keep my elements sorted. The sort order is defined by a sortblock,
a two-argument block which, when given two elements of the collection,
should return true if the element given as first arg has to come before the
element given as second arg.
Thus a sortBlock of [:a :b | a < b] defines ascending sort-order,
while [:a :b | a > b] defines descening order.
The default sortBlock for SortedCollections is the first one.
"
! !
!SortedCollection class methodsFor:'initialization'!
initialize
DefaultSortBlock := [:a :b | a < b ]
"SortedCollection initialize"
! !
!SortedCollection class methodsFor:'instance creation'!
new
"return a new sortedCollection, the sorting is done using
a compare for a > b, in ascending order"
^ super new setSortBlock:DefaultSortBlock
!
new:size
"return a new sortedCollection with preallocated size.
The sorting is done using a compare for a > b, in ascending order"
^ (super new:size) setSortBlock:DefaultSortBlock
!
sortBlock:aBlock
"set the sort-block"
^ super new setSortBlock:aBlock
!
withAll:aCollection sortBlock:aBlock
"initialize from aCollection and set the sort-block"
^ (self sortBlock:aBlock) addAll:aCollection
"
SortedCollection withAll:#(1 2 3 4 5 6 7 8 9 0)
sortBlock:[:a :b | a > b]
"
! !
!SortedCollection methodsFor:'copying'!
copyEmpty:size
"return a copy of the receiver with no elements, but
the same size. This method has been be redefined to
preserve the sortBlock."
^ (self species new:size) sortBlock:sortBlock
! !
!SortedCollection methodsFor:'adding & removing'!
addFirst:anObject
"catch this - its not allowed for sortedCollections"
self shouldNotImplement
!
addLast:anObject
"catch this - its not allowed for sortedCollections"
self shouldNotImplement
!
at:index put:anObject
"catch this - its not allowed for sortedCollections"
self shouldNotImplement
!
add:newObject after:oldObject
"catch this - its not allowed for sortedCollections"
self shouldNotImplement
!
add:newObject before:oldObject
"catch this - its not allowed for sortedCollections"
self shouldNotImplement
!
addAll:aCollection
"add all elements of the argument, aCollection to the
receiver"
|mySize "{ Class: SmallInteger }"
otherSize "{ Class: SmallInteger }"
dstIndex "{ Class: SmallInteger }"
newSize newContents|
"if aCollection is bigger than a threshhold, its faster
to add all and resort - question: what is a good treshhold ?"
mySize := self size.
otherSize := aCollection size.
((mySize == 0) or:[otherSize > 5]) ifTrue:[
newSize := mySize + otherSize.
newContents := Array new:newSize.
newContents replaceFrom:1 to:mySize with:contentsArray startingAt:1.
aCollection isSequenceableCollection ifTrue:[
"maybe we can do it in one big move"
newContents replaceFrom:(mySize + 1) to:newSize with:aCollection startingAt:1.
] ifFalse:[
dstIndex := mySize + 1.
aCollection do:[:element |
newContents at:dstIndex put:element.
dstIndex := dstIndex + 1
]
].
firstIndex := 1.
lastIndex := newSize.
contentsArray := newContents.
contentsArray sort:sortBlock.
^ self
].
super addAll:aCollection
"
#(7 3 9 10 99) asSortedCollection addAll:#(77 0 1 16 5)
"
!
add:anObject
"add the argument, anObject at the proper place in the
receiver. Returns the argument, anObject."
|index|
lastIndex < firstIndex "i.e. self size == 0" ifTrue:[
super add:anObject
] ifFalse:[
index := self indexForInserting:anObject.
self makeRoomAtIndex:index.
contentsArray at:index put:anObject
].
^ anObject
"
|c| #(7 3 9 10 99) asSortedCollection add:5; yourself
#(7 3 9 10 99) asSortedCollection add:1; yourself
#(7 3 9 10 99) asSortedCollection add:1000; yourself
"
! !
!SortedCollection methodsFor:'copying'!
postCopyFrom:anOriginal
"sent after a copy or when a new collection species has been created.
The new collection should have the same sortBlock as the original."
sortBlock := anOriginal sortBlock
"
#(4 7 1 99 -1 17) asSortedCollection inspect
#(4 7 1 99 -1 17) asSortedCollection copy inspect
(#(4 7 1 99 -1 17) asSortedCollection sortBlock:[:a :b | a > b]) inspect
(#(4 7 1 99 -1 17) asSortedCollection sortBlock:[:a :b | a > b]) copy inspect
(#(4 7 1 99 -1 17) asSortedCollection select:[:e| e even]) inspect
"
! !
!SortedCollection methodsFor:'converting'!
asSortedCollection
"return the receiver as a sorted collection"
"could be an instance of a subclass..."
self class == SortedCollection ifTrue:[
^ self
].
^ super asSortedCollection
! !
!SortedCollection methodsFor:'enumerating'!
collect:aBlock
"evaluate the argument, aBlock for every element in the collection
and return a collection of the results. Redefined to return an OrderedCollection;
see X3J20 spec. (SortedCollection>>collect: should return an OrderedCollection)"
|newCollection
start "{ Class:SmallInteger }"
stop "{ Class:SmallInteger }" |
newCollection := OrderedCollection new:(self size).
stop := lastIndex.
start := firstIndex.
start to:stop do:[:index |
newCollection add:(aBlock value:(contentsArray at:index)).
].
^ newCollection
! !
!SortedCollection methodsFor:'testing'!
includes:anObject
"return true, if the argument, anObject is in the collection.
Redefined, since due to being sorted, the inclusion check can
be done with log-n compares i.e. much faster."
|index "{ Class: SmallInteger }"|
index := self indexForInserting:anObject.
((index < firstIndex) or:[index > lastIndex]) ifTrue:[^ false].
^ (contentsArray at:index) = anObject
"
#(7 3 9 10 99) asSortedCollection includes:50
#(7 3 9 10 99) asSortedCollection includes:10
"
!
occurrencesOf:anObject
"return how many times the argument, anObject is in the collection.
Redefined, since due to being sorted, the range of checked objects
can be limited i.e. it can be done much faster."
|index "{ Class: SmallInteger }"
tally "{ Class: SmallInteger }" |
index := self indexForInserting:anObject.
((index < firstIndex) or:[index > lastIndex]) ifTrue:[^ 0].
tally := 0.
[(index <= lastIndex) and:[(contentsArray at:index) = anObject]] whileTrue:[
tally := tally + 1.
index := index + 1
].
^ tally
"
#(7 3 9 10 99) asSortedCollection occurrencesOf:50
#(7 3 9 10 99) asSortedCollection occurrencesOf:10
#(7 10 3 10 9 10 10 99) asSortedCollection occurrencesOf:10
"
! !
!SortedCollection methodsFor:'searching'!
before:anObject
"return the element before the argument, anObject; or nil if there is none.
If the receiver does not contain anObject, report an error"
^ self before:anObject ifAbsent:[self errorValueNotFound:anObject]
"
#(7 3 9 10 99) asSortedCollection before:50
#(7 3 9 10 99) asSortedCollection before:1
#(7 3 9 10 99) asSortedCollection before:1000
#(7 3 9 10 99) asSortedCollection before:10
#(7 3 9 10 99) asSortedCollection before:7
#(7 3 9 10 99) asSortedCollection before:99
#(7 10 3 10 9 10 10 99) asSortedCollection before:9
#(7 10 3 10 9 10 10 99) asSortedCollection before:10
"
!
before:anObject ifAbsent:exceptionBlock
"return the element before the argument, anObject; or nil if there is none.
If the receiver does not contain anObject, return the result from evaluating
exceptionBlock."
|index "{ Class: SmallInteger }"|
index := self indexForInserting:anObject.
((index <= firstIndex)
or:[(contentsArray at:index) ~= anObject]) ifTrue:[^ exceptionBlock value].
^ contentsArray at:index - 1
"
#(7 3 9 10 99) asSortedCollection before:50
#(7 3 9 10 99) asSortedCollection before:1
#(7 3 9 10 99) asSortedCollection before:10
#(7 3 9 10 99) asSortedCollection before:7
#(7 3 9 10 99) asSortedCollection before:99
#(7 10 3 10 9 10 10 99) asSortedCollection before:9
#(7 10 3 10 9 10 10 99) asSortedCollection before:10
"
!
after:anObject
"return the element after the argument, anObject; or nil if there is none.
If the receiver does not contain anObject, report an error"
^ self after:anObject ifAbsent:[self errorValueNotFound:anObject]
"
#(7 3 9 10 99) asSortedCollection after:50
#(7 3 9 10 99) asSortedCollection after:1
#(7 3 9 10 99) asSortedCollection after:10
#(7 3 9 10 99) asSortedCollection after:7
#(7 3 9 10 99) asSortedCollection after:99
#(7 10 3 10 9 10 10 99) asSortedCollection after:9
#(7 10 3 10 9 10 10 99) asSortedCollection after:10
"
!
after:anObject ifAbsent:exceptionBlock
"return the element after the argument, anObject; or nil if there is none.
If the receiver does not contain anObject, return the result from evaluating
exceptionBlock."
|index "{ Class: SmallInteger }"|
index := self indexForInserting:anObject.
((index < firstIndex)
or:[(contentsArray at:index) ~= anObject]) ifTrue:[^ exceptionBlock value].
"skip multiple occurences of the same ..."
[(index <= lastIndex) and:[(contentsArray at:index) = anObject]] whileTrue:[
index := index + 1
].
(index > lastIndex) ifTrue:[^ nil].
^ contentsArray at:index
! !
!SortedCollection methodsFor:'instance protocol'!
sortBlock
"return the block used for sorting"
^ sortBlock
!
sortBlock:aSortBlock
"change the sort criteria for a sorted collection, resort the elements of
the collection, and return the receiver. The argument, aSortBlock must
be a two-argument block which returns true if its arg1 has to come before
its arg2 in the collection."
sortBlock := aSortBlock.
lastIndex > firstIndex ifTrue:[
contentsArray quickSortFrom:firstIndex to:lastIndex sortBlock:aSortBlock
]
"
#(9 8 7 6 5 4 3) asSortedCollection
#(9 8 7 6 5 4 3) asSortedCollection sortBlock:[:a : b | a < b]
#(9 8 7 6 5 4 3) asSortedCollection sortBlock:[:a : b | a > b]
#($f $G $z $Y $o $H) asSortedCollection
#($f $G $z $Y $o $H) asSortedCollection sortBlock:[:a : b | a asUppercase < b asUppercase]
"
! !
!SortedCollection methodsFor:'private'!
setSortBlock: aSortBlock
"set the sortblock without resorting - private only"
sortBlock := aSortBlock
!
indexForInserting:anObject
"search the index at which to insert anObject. Can also be used
to search for an existing element by checking if the element at
the returned index is the one we look for.
The returned index is a physical one, for accessing contentsArray."
|low "{ Class: SmallInteger}"
high "{ Class: SmallInteger}"
middle "{ Class: SmallInteger}"
element|
"
we can of course use a binary search - since the elements are
sorted
"
low := firstIndex.
high := lastIndex.
[low <= high] whileTrue:[
middle := (low + high) // 2.
element := contentsArray at:middle.
(sortBlock value:element value:anObject) ifTrue:[
"middleelement is smaller than object"
low := middle + 1
] ifFalse:[
high := middle - 1
]
].
^ low
"
#(1 2 3 4 7 99 1313 981989 898989898) asSortedCollection indexForInserting:50
#(1.0 2.0 3 4 7 49.0 51.0 99 1313 981989 898989898) asSortedCollection indexForInserting:50
"
! !