using collect on a ReadStream

Hi,

I get a ReadStream from some part of a program which is
created this way

stream := (ReadStream on: #( #(#a #b) #(#b #c)))

I like to use collect: on that stream:

stream collect: [:each| 'k',each first]

Is there a possibility to specify the resulting collection
produced by collect. The problem here is the species
call with an add: call afterwards which is not appropriate
(the debugger said :) )

thanks,

Norbert

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Hi Norbert,

Streams don't support the collection protocols.  You can convert a  
stream to a collection by sending #contents to the stream:

stream := (ReadStream on: #( #(#a #b) #(#b #c))).
stream contents collect: [:each| 'k',each first] --> #('ka' 'kb')

Is that what you want?

Cheers, Oscar

On Oct 30, 2007, at 2:00, Norbert Hartl wrote:

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On Tue, 2007-10-30 at 08:03 +0100, Oscar Nierstrasz wrote: Sure, it works :) What I do not understand is that a lot of the
collection protocol is in ReadStream. It has detect: select:
collect: includes: ... What is it for?

thanks,

Norbert

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Strange.  I do not see these methods supported by ReadStream in my  
image.

I only see 13 implementors of #collect:

What does your implementation of ReadStream>>collect: say?

Oscar

On Oct 30, 2007, at 8:20, Norbert Hartl wrote:

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On Tue, 2007-10-30 at 08:27 +0100, Oscar Nierstrasz wrote:
> Strange.  I do not see these methods supported by ReadStream in my  
> image.
>
> I only see 13 implementors of #collect:
>
> What does your implementation of ReadStream>>collect: say?
>
Oh, I'm sorry. The methods in ReadStream are added by Glorp. So
I take another list for asking :)

FYI the implementation is

ReadStream>>collect: aBlock
        | newStream |
        newStream := AddingWriteStream on: collection species new.
        [self atEnd] whileFalse: [newStream nextPut: (aBlock value: self
next)].
        ^newStream contents

Norbert

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