Ron Teitelbaum wrote :
Hi Mathieu, I've been thinking about how to respond to your question. My first thought was to jump right in and help, but since this is a home work assignment it is probably best to help in a round about way. What I didn't want to do was to discourage others that are working on homework from asking questions.
Yes, I understand and I agree, in fact I did not express myself properly.
So in order to help you I propose the following. I will help to explain the patterns you mentioned, and I will critique your solution, all without helping you solve the problem you are trying to solve, so that you can benefit from doing and learning from your homework assignment.
First the critique: I really don't like your implementation of using a dictionary to handle your collection. It seems to me that you are trying to accomplish something but I don't see what the benefit of that implementation is. Can you tell me what functionality the dictionary adds? What is the benefit of the dictionary over a simple collection?
Thinking a bit more the appropriate term for my previous Performance class should be PerformanceFactory or something like this. My idea is to provide a Performance per sport. But I have to consider that only one TimeLaps or Distance should be added to a Performance. So my difficulty first is to do this.
Thanks for your explanation of Visitor pattern. In fact I already read it from "The design pattern Smalltalk companion" book and I want to know the different way of implementation and if it could be applicable for me.
From: math Sent: Thursday, May 25, 2006 10:22 AM
Subject: Design with Visitor From: "Mathieu SUEN" mathk.sue@gmail.com Date: Wed, 24 May 2006 23:14:58 +0200 To: beginners-bounces@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 (: _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
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 _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
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