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"
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COPYRIGHT (c) 1994 by Claus Gittinger
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All Rights Reserved
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90
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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Object subclass:#ObsoleteObject
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instanceVariableNames:''
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classVariableNames:'ObsoleteObjectSignal'
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poolDictionaries:''
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category:'System-BinaryStorage'
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90
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!
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ObsoleteObject comment:'
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COPYRIGHT (c) 1994 by Claus Gittinger
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All Rights Reserved
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'!
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!ObsoleteObject class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1994 by Claus Gittinger
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210
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All Rights Reserved
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90
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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version
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"
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$Header: /cvs/stx/stx/libbasic/Attic/ObsoleteObject.st,v 1.2 1994-11-21 17:05:13 claus Exp $
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"
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!
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documentation
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"
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This class is used for error handling during binary object restoration.
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Whenever an object whose class has changed (i.e. it was stored with a
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different layout/size) is about to be restored, it cannot be made an
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instance of the now existing class.
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In this case, the BinaryInputManager will create a dummy class for the
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old (obsolete) object. This dummy class will be a subclass of ObsoleteObject.
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After the creation of the obsolete object, a signal will be raised (in
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BinaryInputManager), which can be cought by the application to try some
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automatic or semi-automatic object conversion.
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The signal gets the obsolete object and the new class as parameters.
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ObsoleteObject itself catches all messages, to avoid any use of the restored
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object (in case conversion failed or the signal was ignored).
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"
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! !
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!ObsoleteObject class methodsFor:'initialization'!
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initialize
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ObsoleteObjectSignal isNil ifTrue:[
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ObsoleteObjectSignal := (Signal new) mayProceed:false.
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ObsoleteObjectSignal nameClass:self message:#obsoleteObjectSignal.
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ObsoleteObjectSignal notifierString:'use of obsolete object'.
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self setSuperclass:nil
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]
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! !
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!ObsoleteObject class methodsFor:'signal access'!
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obsoleteObjectSignal
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"return the signal raised when a message is sent to an Obsolete
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signal"
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^ ObsoleteObjectSignal
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! !
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!ObsoleteObject methodsFor:'message catching'!
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doesNotUnderstand: aMessage
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"the only thing obsolete objects understand is that they dont understand
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anything."
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^ ObsoleteObjectSignal
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raiseRequestWith:aMessage
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! !
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ObsoleteObject initialize!
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