Chris,

	yes the MagmaCollection has that feature when you send:

	#read: aSymbol from:aString to: otherString

	The other features MagmaCollection has are very interesting.

	I'm trying to use GOODS as platform of persistence and this
IndexedCollection (vey like MagmaCollection) as the optimzed structure
to access this odb engine. 

	thank you for the clue,

Sebastián Sastre
ssastre at seaswork.com.ar
www.seaswork.com.ar


> -----Mensaje original-----
> De: squeak-dev-bounces at lists.squeakfoundation.org 
> [mailto:squeak-dev-bounces at lists.squeakfoundation.org] En 
> nombre de Chris Muller
> Enviado el: Miércoles, 15 de Septiembre de 2004 01:44
> Para: Squeak List
> Asunto: Re: Searcheable BTree
> 
> 
> > for a BTree, a message like
> >    
> >    >>keysStartingWith: aString
> > 
> >    that returns a set of keys will be *very* useful.
> 
> Hi Sebastian, please excuse me if I've misunderstood what 
> you're looking for. 
> MaHashIndex *may* be an example of what you're looking for.
> 
> Here are some of its characteristics to help you determine 
> whether it is suitable.
> 
>   - supports key sizes from 32 to 256 bits, values are only 64 bits
>   - provides key-order enumeration from any key or absolute-position
>   - key and absolute-position access is very fast, insertion 
> is pretty slow, removal is very slow.
>   - supports duplicate keys
>   - includes *extensive* test cases that demonstrate its 
> capability and correctness
> 
> Here is some of the main public api:
> 
>   includesKey: keyInteger
>   indexOf: keyInteger  "answers the absolute position of the 
> lowest of that key"
>   numberOfEntriesFrom: lowKey to: highKey
>   occurrencesOf: keyInteger
>   size
>   upTo: count keysFromIndex: "absolute" startPosition
>   upTo: count oidsFrom: lowKey to: highKey
>   upTo: count oidsFromIndex: "absolute" startPosition
> 
> It maintains a randomly-accessed file for its storage and no 
> reorganization is ever needed since it happens dynamically.
> 
> The test cases do take a while to run because they are quite 
> stringent and extensive.
> 
> Cheers,
>   Chris
> 
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