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smalltalk-1.1.1
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ReadStream.st
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1991-09-12
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"======================================================================
|
| ReadStream 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
| sbyrne 19 Sep 89 Converted to use real method categories.
|
| sbyrne 25 Apr 89 created.
|
"
PositionableStream subclass: #ReadStream
instanceVariableNames: ''
classVariableNames: ''
poolDictionaries: ''
category: nil.
ReadStream comment:
'I implement the set of read-only stream objects. You may read from
my objects, but you may not write to them.' !
!ReadStream class methodsFor: 'instance creation'!
on: aCollection
^(self new initCollection: aCollection) access: 1
!!
!ReadStream methodsFor: 'accessing-reading'!
reverseContents
"May be faster than generic stream reverseContents."
| aCollection i numElts |
numElts _ collection size.
aCollection _ collection species new: numElts.
i _ 1.
[ i < endPtr ] whileTrue:
[ aCollection at: numElts - i + 1
put: (collection at: i) ].
^aCollection
!!
!ReadStream methodsFor: 'private methods'!
initCollection: aCollection
collection _ aCollection.
ptr _ 1.
endPtr _ collection size
!!