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Collection.st
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1991-09-12
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"======================================================================
|
| Collection Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 1, or (at your option) any later version.
|
| GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
| details.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbb 12 Sep 91 Changed printOn: to recursively call printOn:
|
| sbb 12 Sep 91 Fix detect: method to return the value
|
| sbyrne 25 Apr 89 created.
|
"
Object subclass: #Collection
instanceVariableNames: ''
classVariableNames: ''
poolDictionaries: ''
category: nil.
Collection comment:
'I am an abstract class. My instances are collections of objects. My
subclasses may place some restrictions or add some definitions to how
the objects are stored or organized; I say nothing about this. I merely
provide some object creation and access routines for general collections
of objects.' !
!Collection class methodsFor: 'instance creation'!
with: anObject
^self new add: anObject; yourself
!
with: firstObject with: secondObject
^self new add: firstObject; add: secondObject; yourself
!
with: firstObject with: secondObject with: thirdObject
^self new add: firstObject; add: secondObject; add: thirdObject; yourself
!
with: firstObject with: secondObject with: thirdObject with: fourthObject
^self new add: firstObject; add: secondObject; add: thirdObject;
add: fourthObject; yourself
!!
!Collection methodsFor: 'Adding to a collection'!
add: newObject
self subclassResponsibility
!
addAll: aCollection
aCollection do: [ :element | self add: element ].
^aCollection
!!
!Collection methodsFor: 'Removing from a collection'!
remove: oldObject ifAbsent: anExceptionBlock
self subclassResponsibility
!
remove: oldObject
self remove: oldObject
ifAbsent: [ ^self error: 'Failed to remove object' ].
^oldObject
!
removeAll: aCollection
" ??? we're supposed to report an error if an object can't be removed
properly. I've elected to let remove: report the error. Also, it's
not clear whether we're supposed to remove all occurrences of the
members of aCollection from the receiver, or only the first."
aCollection do: [ :element | self remove: element ].
^aCollection
!!
!Collection methodsFor: 'testing collections'!
includes: anObject
self do: [ :element | anObject = element ifTrue: [ ^true ] ].
^false
!
isEmpty
^self size == 0
!
occurrencesOf: anObject
| count |
count _ 0.
self do: [ :element | anObject == element ifTrue: [ count _ count + 1 ] ].
^count
!
size
| count |
count _ 0.
self do: [ :element | count _ count + 1].
^count
!!
!Collection methodsFor: 'enumerating the elements of a collection'!
do: aBlock
self subclassResponsibility
!
select: aBlock
| newCollection |
" ### I don't know if this is the right way to create a new collection
in all cases...I suspect that it is not..."
newCollection _ self species new.
self do: [ :element | (aBlock value: element)
ifTrue: [ newCollection add: element ]
].
^newCollection
!
reject: aBlock
| newCollection |
" ### I don't know if this is the right way to create a new collection
in all cases...I suspect that it is not..."
newCollection _ self species new.
self do: [ :element | (aBlock value: element)
ifFalse: [ newCollection add: element ]
].
^newCollection
!
collect: aBlock
| newCollection |
" ### I don't know if this is the right way to create a new collection
in all cases...I suspect that it is not..."
newCollection _ self species new.
self do: [ :element | newCollection add: (aBlock value: element) ].
^newCollection
!
detect: aBlock ifNone: exceptionBlock
self do: [ :element | (aBlock value: element) ifTrue: [ ^element ] ].
exceptionBlock value
!
detect: aBlock
^self detect: aBlock ifNone: [ ^self error: 'Collection detect: failed']
!
inject: thisValue into: binaryBlock
self do: [ :element | thisValue _ binaryBlock value: thisValue
value: element ].
^thisValue
!!
!Collection methodsFor: 'converting'!
asBag
| aBag |
aBag _ Bag new.
self do: [ :element | aBag add: element ].
^aBag
!
asSet
| aSet |
aSet _ Set new: self size.
self do: [ :element | aSet add: element ].
^aSet
!
asOrderedCollection
| anOrderedCollection |
anOrderedCollection _ OrderedCollection new: self size.
self do: [ :element | anOrderedCollection add: element ].
^anOrderedCollection
!
asSortedCollection
| aSortedCollection |
aSortedCollection _ SortedCollection new.
self do: [ :element | aSortedCollection add: element ].
^aSortedCollection
!
asSortedCollection: aBlock
| aSortedCollection |
aSortedCollection _ SortedCollection sortBlock: aBlock.
self do: [ :element | aSortedCollection add: element ].
^aSortedCollection
!!
!Collection methodsFor: 'printing'!
printOn: aStream
| firstTime |
firstTime _ true.
aStream nextPutAll: self classNameString.
aStream nextPutAll: ' ('.
self do:
[ :element | firstTime ifTrue: [ firstTime _ false ]
ifFalse: [ aStream nextPut: Character space ].
element printOn: aStream ].
aStream nextPut: $)
!!
!Collection methodsFor: 'storing'!
store: aStream
| noElements |
aStream nextPut: $(.
aStream nextPutAll: self classNameString.
aStream nextPutAll: ' new'.
noElements _ true.
self do:
[ :element | aStream nextPutAll: ' add: '.
element storeOn: aStream.
aStream nextPut: $;.
noElements _ false ].
noElements ifFalse: [ aStream nextPutAll: ' yourself' ].
aStream nextPut: $)
!!