Hello James,
First, thank you for your reply.
So, we would have 2 choices:
1- model it as Employment (i.e. moment-interval)
Person -(1)------(0..*)- Employment -(1..*)-------(1)-Company
2-model it as Employee (i.e Role).
Person -(1)------(0..*)- Employee -(1..*)-------(1)-Company
Or, perhaps, a 3rd one too: hane both Employee and Employment
3- have both Employment and Employee.
Person -(1)------(0..*)- Employee -(1..*)-------(1)-Company
|
(1)
|
|
(0..*)
|
Employment
Now, questions:
1- Would we still need to have association between Peosn and Company?
2- What would be the (dis)advantages of not modeling Employee/Employment as
an association class?
Thanks.
George
>From: "Baker, James D" <[EMAIL PROTECTED]>
>Reply-To: "Baker, James D" <[EMAIL PROTECTED]>
>To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
>Subject: FW: (ROSE) would anyone give me an detailed explaination of assoc
>iation
>Date: Fri, 22 Dec 2000 08:43:22 -0800
>
>
>
>
>As I described it, Employment is not a role. It could be a
>moment-interval.
>
>I discussed this issue with Ron Norman, a CCM I'm acquainted with. If you
>want to model this differently, you could use roles. Both Coad and Martin
>Fowler, in his writings on analysis patterns, suggest the use of roles
>where
>the association has interesting behavior.
>
>Ron said:
>
>I think it might also be modeled as: Company class (green), Person class
>(green), and Employee (yellow). Employee would be role played and
>associated
>with Person who is associated with Company. Employee could have same
>attributes as you suggest so long as the role is for a single person
>working
>for a single company (roles usually have 0..1 multiplicity between them and
>their person/place/thing (green) class.
>Bottom line: depends on the domain requirements one is modeling...sometimes
>an association class, other times a role. Roles usually only come into play
>when their behavior (methods) is interesting and different from other roles
>played by the same or different people/place/thing objects.
>
>
>J.D.
>My ideas, my words. You can't blame anyone that might employ me for them.
>
>
>-----Original Message-----
>From: george brown [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, December 21, 2000 2:21 PM
>To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
>Subject: RE: (ROSE) would anyone give me an detailed explaination of
>assoc iation
>
>
>
>Hi James,
>Is the association class of Employment conceptually a "role" played by a
>Person in a Company. I.e. what Coad refers to it in "Java Modeling ...
>using
>
>UML"? I'm not really sure if you've read the book, anyway.
>
>Thanks,
>George
>
>
>
> >From: "Baker, James D" <[EMAIL PROTECTED]>
> >Reply-To: "Baker, James D" <[EMAIL PROTECTED]>
> >To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
> >Subject: RE: (ROSE) would anyone give me an detailed explaination of
>assoc
> >iation
> >Date: Thu, 21 Dec 2000 07:30:02 -0800
> >
> >
> >See if this makes any sense to you.
> >
> >If you have a Person class and a Company class, then one association
> >between
> >Person and Company might be Employment. Employment has several
>attributes
> >you might want to maintain, such as start date, current salary, vacation
> >days accrued, etc. In this case, the association would be modeled as a
> >class.
> >
> >To generalize from this example, association classes are used when you
>want
> >to specify attributes and operations for an association. There is a
> >constraint placed on the association class that there can be only one
> >instance of the association class for any set of instances of the other
>two
> >classes.
> >
> >HTH,
> >
> >J.D. Baker
> >My ideas, my words. You can't blame anyone that might employ me for them.
> >
> >-----Original Message-----
> >From: daniel wang [mailto:[EMAIL PROTECTED]]
> >Sent: Thursday, December 21, 2000 6:40 PM
> >To: [EMAIL PROTECTED]
> >Subject: (ROSE) would anyone give me an detailed explaination of
> >association
> >
> >
> >hi :
> > i don't really understand the association class in uml. when i
>should
> >make use of them?
> >best regards
> >
> >daniel
> >
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