/usr/share/gnu-smalltalk/kernel/Association.st is in gnu-smalltalk-common 3.2.4-2.
This file is owned by root:root, with mode 0o644.
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|
| Association Method Definitions
|
|
======================================================================"
"======================================================================
|
| Copyright 1988,92,94,95,99,2000,2001,2002
| Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
|
| The GNU Smalltalk class library 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 Lesser
| General Public License for more details.
|
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.
|
======================================================================"
LookupKey subclass: Association [
| value |
<category: 'Language-Data types'>
<comment: 'My instances represent a mapping between two objects. Typically, my
"key" object is a symbol, but I don''t require this. My "value" object has
no conventions associated with it; it can be any object at all.'>
Association class >> key: aKey value: aValue [
"Answer a new association with the given key and value"
<category: 'basic'>
^self new key: aKey value: aValue
]
environment [
"Answer nil. This is present to achieve polymorphism with
instances of VariableBinding."
<category: 'accessing'>
^nil
]
environment: aNamespace [
"Do nothing. This is present to achieve polymorphism with
instances of VariableBinding."
<category: 'accessing'>
]
value: aValue [
"Set the association's value to aValue"
<category: 'accessing'>
value := aValue
]
key: aKey value: aValue [
"Set the association's key to aKey, and its value to aValue"
<category: 'accessing'>
key := aKey.
value := aValue
]
value [
"Answer the association's value"
<category: 'accessing'>
^value
]
= anAssociation [
"Answer whether the association's key and value are the same as
anAssociation's, or false if anAssociation is not an Association.
As a special case, identical values are considered equal even if
#= returns false (as is the case for NaN floating-point values)."
<category: 'testing'>
self class == anAssociation class ifFalse: [^false].
self key = anAssociation key ifFalse: [^false].
self value == anAssociation value ifTrue: [^true].
^self value = anAssociation value
]
hash [
"Answer an hash value for the receiver"
<category: 'testing'>
^key hash bitXor: value hash
]
printOn: aStream [
"Put on aStream a representation of the receiver"
<category: 'printing'>
self key printOn: aStream.
aStream nextPutAll: '->'.
self value printOn: aStream
]
storeOn: aStream [
"Put on aStream some Smalltalk code compiling to the receiver"
<category: 'storing'>
aStream nextPut: $(.
aStream store: self class.
aStream nextPutAll: ' key: '.
self key storeOn: aStream.
aStream nextPutAll: ' value: '.
self value storeOn: aStream.
aStream nextPut: $)
]
mourn [
"Finalize the receiver"
<category: 'finalization'>
self key: nil value: nil
]
]
|