"

 COPYRIGHT (c) 2009 by 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:libview2' }"

ValueHolder subclass:#TypedValueHolder

	instanceVariableNames:'types'

	classVariableNames:''

	poolDictionaries:''

	category:'Interface-Support-Models'

!

!TypedValueHolder class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 2009 by 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 is simply a valueHolder which checks new values against a given type.

    Useful to debug/trap invalid setters (such as those storing a true into a numeric holder)

    [author:]

        Claus Gittinger

"

!

examples 

"

                                                                        [exBegin]

        |v|

        v := (TypedValueHolder with:1) type:Number.

        (Delay forSeconds:3) wait.

        v value:nil.

                                                                        [exEnd]

                                                                        [exBegin]

        |v|

        v := (TypedValueHolder with:1) types:{UndefinedObject. Number}.

        (Delay forSeconds:3) wait.

        v value:nil.

        (Delay forSeconds:3) wait.

        v value:'huh'.

                                                                        [exEnd]

"

! !

!TypedValueHolder methodsFor:'accessing'!

type:aClass

    self types:(Array with:aClass)

!

types:aCollectionOfTypes

    types := aCollectionOfTypes.

!

value:newValue

    types notNil ifTrue:[

        (types contains:[:type | newValue isKindOf:type]) ifFalse:[

            self error:'Unvalid value stored in typed valueHolder' mayProceed:true

        ]

    ].

    ^ super value:newValue.

! !

!TypedValueHolder class methodsFor:'documentation'!

version_CVS

    ^ '$Header: /cvs/stx/stx/libview2/TypedValueHolder.st,v 1.2 2009-11-06 19:24:27 cg Exp $'

! !