"

 COPYRIGHT (c) 1997 by eXept Software AG / 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.

"

"{ Package: 'stx:libbasic' }"

Object subclass:#OSErrorHolder

	instanceVariableNames:'errorSymbol errorCategory'

	classVariableNames:'Signals OSErrorSignal'

	poolDictionaries:''

	category:'OS-Support'

!

!OSErrorHolder class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1997 by eXept Software AG / 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.

"

!

documentation

"

    This class represents low level operating system errors.

    We do not use error numbers, because there may be different errnos

    for the same error on different systems.

    [instance variables:]

        errorSymbol             symbol associated with this error

        errorCategory           symbol defining the error category.

                                This is in fact a symbol that returns a

                                Signal when sent to myself.

        While the errorSymbol may be different on different platforms,

        the errorCategories (which refer to the Signals that will be raised) 

        are identical.

        You can get an OS independent error message for an error by sending

        #errorCategoryString.

    [author:]

        Stefan Vogel

    [see also:]

        OperatingSystem

"

! !

!OSErrorHolder class methodsFor:'Signal constants'!

allocRetrySignal

    ^ Signals at:#allocRetrySignal

!

badAccessorSignal

    ^ Signals at:#badAccessorSignal

!

badArgumentsSignal

    ^ Signals at:#badArgumentsSignal

!

existingReferentSignal

    ^ Signals at:#existingReferentSignal

!

illegalOperationSignal

    ^ Signals at:#illegalOperationSignal

!

inaccessibleSignal

    ^ Signals at:#inaccessibleSignal

!

inappropriateOperationSignal

    ^ Signals at:#inappropriateOperationSignal

!

inappropriateReferentSignal

    ^ Signals at:#inappropriateReferentSignal

!

invalidArgumentsSignal

    "return the signal for invalid arguments (e.g. right class, wrong value)."

    ^ OsInvalidArgumentsError

!

needRetrySignal

    ^ Signals at:#needRetrySignal

!

noDataSignal

    ^ Signals at:#noDataSignal

!

noMemorySignal

    ^ Signals at:#noMemorySignal

!

noPermissionsSignal

    ^ Signals at:#noPermissionsSignal

!

noResourcesSignal

    ^ Signals at:#noResourcesSignal

!

nonexistentSignal

    "return the signal for non existing referents (i.e. device, file etc.)."

    ^ Signals at:#nonexistentSignal

!

notReadySignal

    ^ Signals at:#notReadySignal

!

peerFaultSignal

    ^ Signals at:#peerFaultSignal

!

rangeErrorSignal

    ^ Signals at:#rangeErrorSignal

!

transferFaultSignal

    ^ Signals at:#transferFaultSignal

!

transientErrorSignal

    ^ Signals at:#transientErrorSignal

!

unavailableReferentSignal

    ^ Signals at:#unavailableReferentSignal

!

underSpecifiedSignal

    ^ Signals at:#underSpecifiedSignal

!

unpreparedOperationSignal

    ^ Signals at:#unpreparedOperationSignal

!

unsupportedOperationSignal

    ^ Signals at:#unsupportedOperationSignal

!

volumeFullSignal

    ^ Signals at:#volumeFullSignal

!

wrongSubtypeForOperationSignal

    ^ Signals at:#wrongSubtypeForOperationSignal

! !

!OSErrorHolder class methodsFor:'accessing'!

errorSignal

    ^ OperatingSystem errorSignal

    "Created: 25.1.1997 / 18:07:55 / cg"

! !

!OSErrorHolder class methodsFor:'class initialization'!

initialize

    "init signals etc."

    |s|

    OSErrorSignal isNil ifTrue:[

        OSErrorSignal := OsError.

        OSErrorSignal notifierString:'OperatingSystem error'.

        Signals := Dictionary new:28.

        OsNoResourcesError notifierString:'Not enough resources'.

        Signals at:#noResourcesSignal put:OsNoResourcesError.

        OsIllegalOperation notifierString:'Illegal Operation'.

        Signals at:#illegalOperationSignal put:OsIllegalOperation. 

        OsInvalidArgumentsError notifierString:'Invalid Arguments'.

        Signals at:#invalidArgumentsSignal put:OsInvalidArgumentsError. 

        OsInaccessibleError notifierString:'Referent inaccessible'.

        Signals at:#inaccessibleSignal put:OsInaccessibleError. 

        OsTransferFaultError notifierString:'Transfer fault'.

        Signals at:#transferFaultSignal put:OsTransferFaultError. 

        OsNeedRetryError notifierString:'Retry Operation'.

        Signals at:#needRetrySignal put:OsNeedRetryError. 

false ifTrue:[

        "/ Information signals

        s := self setupSignal:#informationSignal parent:OSErrorSignal 

                     notifier:'Information'.

        self setupSignal:#operationStartedSignal parent:s 

                     notifier:'Operation started'.

].

        "/ Retry signals

        self setupSignal:#notReadySignal parent:OsNeedRetryError 

                     notifier:' -- referent not ready'.

        self setupSignal:#transientErrorSignal parent:OsNeedRetryError 

                     notifier:' -- transient error'.

        self setupSignal:#allocRetrySignal parent:OsNeedRetryError 

                     notifier:' -- allocation failure'.

        "/ Resource signals

        self setupSignal:#noMemorySignal parent:OsNoResourcesError 

                     notifier:' -- memory'.

        "/ Transfer faults

        self setupSignal:#noDataSignal parent:OsTransferFaultError 

                     notifier:'Data unavailable/EOF reached'.

        self setupSignal:#peerFaultSignal parent:OsTransferFaultError 

                     notifier:'Communication with peer failed'.

        self setupSignal:#volumeFullSignal parent:OsTransferFaultError 

                     notifier:'Volume full'.

        "/ Inaccesible faults

        self setupSignal:#nonexistentSignal parent:OsInaccessibleError 

                     notifier:'File does not exist'.

        self setupSignal:#unavailableReferentSignal parent:OsInaccessibleError 

                     notifier:' currently'.

        self setupSignal:#noPermissionsSignal parent:OsInaccessibleError 

                     notifier:'Permission denied'.

        self setupSignal:#existingReferentSignal parent:OsInaccessibleError 

                     notifier:' -- already exists or currently in use'.

        self setupSignal:#inappropriateReferentSignal parent:OsInaccessibleError 

                     notifier:' -- operation inappropriate'.

        "/ Illegal operations

        self setupSignal:#inappropriateOperationSignal parent:OsIllegalOperation 

                     notifier:'Inappropriate operation'.

        self setupSignal:#wrongSubtypeForOperationSignal parent:OsIllegalOperation 

                     notifier:' -- wrong subtype'.

        self setupSignal:#unsupportedOperationSignal parent:OsIllegalOperation 

                     notifier:' -- on this platform'.

        self setupSignal:#unpreparedOperationSignal parent:OsIllegalOperation 

                     notifier:' -- wrong sequence'.

        "/ Illegal arguments

        self setupSignal:#badArgumentsSignal parent:OsInvalidArgumentsError 

                     notifier:' -- wrong class'.

        self setupSignal:#badAccessorSignal parent:OsInvalidArgumentsError 

                     notifier:' -- accessor invalid'.

        self setupSignal:#rangeErrorSignal parent:OsInvalidArgumentsError 

                     notifier:' -- out of range'.

        self setupSignal:#underSpecifiedSignal parent:OsInvalidArgumentsError 

                     notifier:' -- operation not fully specified'.

   ].

   "

    OSErrorSignal := nil.

    self initialize

   "

!

setupSignal:aSymbol parent:parentSignal notifier:aString

    "setup a signal, which can be retrieved by sending aSymbol to self.

     Return the new signal"

    |s|

    Signals at:aSymbol

           put:(s := parentSignal newSignal

                        notifierString:aString;

                        nameClass:self message:aSymbol).

    ^ s

! !

!OSErrorHolder methodsFor:'accessing'!

errorSymbol:sym errorCategory:typ

    errorSymbol := sym.

    errorCategory := typ.

! !

!OSErrorHolder methodsFor:'error reporting'!

reportError

    "Report an error."

    "Delegate to the receiver's error reporter."

    (self class perform:errorCategory) raiseWith:self.

self halt.

"/    ^ self errorReporter reportOn:self

! !

!OSErrorHolder methodsFor:'others'!

errorString 

    ^ OperatingSystem errorStringForSymbol:errorSymbol

!

errorSymbol 

    ^ errorSymbol

! !

!OSErrorHolder class methodsFor:'documentation'!

version

    ^ '$Header: /cvs/stx/stx/libbasic/OSErrorHolder.st,v 1.7 2003-08-30 12:30:52 cg Exp $'

! !

OSErrorHolder initialize!