[Newbies] Design with Visitor

[stéphane ducasse]

Pay attention mathieu.
Design patterns can be evil too.
You do not really need a Visitor for your application.
Your performance classes are your domain and your seaside components  
your UI pointing to
the domain objects.

Why do you need a PerfomanceCollection class?

Why do you want to keep in your dictionary the class of its objects?

See you monday :)

Stef
On 25 mai 06, at 16:22, math wrote:

>
>> Subject: Design with Visitor
>> From: "Mathieu SUEN" <mathk.sue at gmail.com>
>> Date: Wed, 24 May 2006 23:14:58 +0200
>> To: beginners-bounces at lists.squeakfoundation.org
>>
>> Hi squeakers,
>>
>> I have to build  a lite code for home work.
>> The objective is to gave to user a possibility to store his sport
>> performance.
>>
>> So I have design a Class Performance(with PerformanceCollection)  
>> and I
>> wanted to let things like TimeLaps, Date, Distance, and so on.
>> for a later implementation (if we wanted to add others).
>>
>> So I provide a Measure abstract  class.
>>
>> Hence I add a dictionary in my Performance with the class for key and
>> the instance for value:
>>
>> for example:
>>
>> Performance>>addMeasure: aMeasure
>>           dictionaryOfMesure at: aMeasure class put: aMeasure
>>
>> Now I have to bring them in a Seaside UI so I guess that Visitor  
>> Pattern
>> ( ;-) ) can help me but my complex structure mess my brain.
>> So I ask you if you think that can be possible(and how) or other  
>> pattern
>> can be more suitable for this problem.
>>
>> Thank you for your attention (:
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>>
> Thinking forward I see that 2 Performance instance couldn't be compare
> so befor asking how to print them I will think about a other  
> structure.
> I think I will use Builder or Factory Method pattern.
>
> Thanks
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