Hi,
When you're in analysis or high level design I think it's better to do what
Huseyin Angay suggest:
+---------+
| class A |
+---------+
| |
|-{XOR}-|
V V
+---------+ +---------+
| class B | | class C |
+---------+ +---------+
When in low level design (just before code generation for that particular class)
one possible solution is to delegate the XOR management to a "role class":
+---------+
| class A |
+---------+
|
V
+---------+
| class R | class R is a "role" and is "realized" in B XOR C
+---------+
/_\
|
+---+---+
| |
+---------+ +---------+
| class B | | class C |
+---------+ +---------+
Regards,
Thomas
At 2/20/01 10:00 AM +0000, Angay, Huseyin (Huseyin)** CTR ** wrote:
>Hi Jan..
>
>I guess you are referring to the XOR constraint between associations. That
>is, there is a link to an instance of one class or another, but not both.
>
>You can show this as a dependency between the two associations. Name the
>dependency {xor}.
>
>Note that I used the expression "show" rather than "model" as Rose ignores
>this dependency as far as code generation is concerned. It is a visual clue
>for the developers only. The attributes will be generated for both
>associations (which is correct). You will need to manually manage the code
>that ensures the exclusivity.
>
>
>Best regards,
>Huseyin Angay
>
>Karabash Ltd.
>www.karabash.co.uk
>
>> ----------
>> From: [EMAIL PROTECTED][SMTP:[EMAIL PROTECTED]]
>> Reply To: [EMAIL PROTECTED]
>> Sent: 19 February 2001 11:05
>> To: [EMAIL PROTECTED]
>> Subject: (ROSE) XOR-Constraints
>>
>>
>>
>>
>>
>> Hy,
>> has anybody an idea to model XOR-Constraints with Rose.
>>
>> viele Grüße Jan
>>
>> Jan Binder
>> DB AG - Lufthansa Systems AS
>> PFI CIO Datenmanagement
>> Mainzer Landstr. 222-224
>> Telefon 069/265-30690
>> Telefax 069/265-30400
>> Mobil 0172/4144356
>> e-mail [EMAIL PROTECTED]
>>
>>
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