1. I have a Base class that has a certain amount of functionality.
2. Then I have a CodeSmith generated class that inherits from the Base class
and adds functionality.
3. Since I want to be able to re-generate the classes on level 2 I have a
3rd level that inherits from them and implements specific hand coded
methods.
4. My colleague asked me to create a 4th level class that inherits the 3rd
level class so he can write custom functionality that overrides the "plain"
functionality at all levels above it.
I have 1-3 implemented as Shared methods.
To me, this enables simpler UI code.
For example:
strSQL = Level3ClassName .Select
In this way I do not need to instantiate an instance of the class I just use
the shared methods in levels 1-3.
=============== =============== =============== ==============
My problem (other than being new and not really understanding this well
enough yet <g> )
is I don't know how to implement Level 4 in a way that allows me to use
Shared methods in levels1-3 and yet Override them in Level 4.
Is it not possible?
=============== =============== =============== =============== ==
If I have to change Levels 1-3 what would you recommend?
=============== =============== =============== ===
Sample code:
Level 1
Public MustInherit Class Base
Public Shared Function DoSomething(ByV al Source As String) As String
End Function
=============== =============== =============== ===
Level 2
Public MustInherit Class GeneratedStuff
Inherits Base
Public Shared Function DoSomethingElse (ByVal Source As String) As String
End Function
=============== =============== =============== ===
Level 3
Public MustInherit Class HandCodedStuff
Inherits GeneratedStuff
Public Shared Function IWroteThis(ByVa l Source As String) As String
End Function
=============== =============== =============== ===
Level 4 (implements same functionality as Level 3 but also allows customized
changes by overriding methods or creating new ones that are specific to a
single client. Level 3 functionality is for all clients.)
Public MustInherit Class FinalLevel
Inherits HandCodedStuff
Overrides Function DoSomethingElse (ByVal Source As String) As String
End Function
Thanks for any advice!
--
Joe Fallon
Nov 20 '05
33  3501 
Good morning Herfried,
Joe gives reasons for wanting to use Shared methods. You may have chosen
to ignore them. The Singleton pattern, while suitable for situations like
this, means that Joe wouldn't continue to enjoy the benefits of avoidiug
object instances and the like.
Using Shadows is a single-word solution. It allows Joe to do exactly what
he asked.
Using the Singleton Pattern takes him into a different ball park. It would
have its own benefits, of course, but learning and implementing it means a
short diversion for Joe.
I hope that Joe learns the Singleton Pattern and continues to learn many
more Design Patterns. But whether he chooses to do so now or uses Shadows now
and learns more OOP later is his choice.
If you fail to see sense in my solution, I suggest that you study a bit
more.
Regards,
Fergus
ps. I was not aware that I had been corrected by anybody. To which post would
you like me to respond with a thank you?
Fergus,
I saw the sense in your suggestion ;-)
And as I stated to Scott, it may be what Joe needs.
Note there are ways to structure the Singleton to have an instance & still
present Shared methods to other developers. One of the easiest ways is to
use an inner class. Where the shared methods call methods on an instance of
a inner class object. I did not present them to Joe as I did not want to
scare him too much.
Jay
"Fergus Cooney" <fi*****@post.c om> wrote in message
news:ur******** *****@TK2MSFTNG P12.phx.gbl... Good morning Herfried,
Joe gives reasons for wanting to use Shared methods. You may have
chosen to ignore them. The Singleton pattern, while suitable for situations like
this, means that Joe wouldn't continue to enjoy the benefits of avoidiug
object instances and the like.
Using Shadows is a single-word solution. It allows Joe to do exactly
what he asked.
Using the Singleton Pattern takes him into a different ball park. It
would have its own benefits, of course, but learning and implementing it means a
short diversion for Joe.
I hope that Joe learns the Singleton Pattern and continues to learn
many more Design Patterns. But whether he chooses to do so now or uses Shadows
now and learns more OOP later is his choice.
If you fail to see sense in my solution, I suggest that you study a
bit more.
Regards,
Fergus
ps. I was not aware that I had been corrected by anybody. To which post
would you like me to respond with a thank you?
* "Cor" <no*@non.com> scripsit: Please
Did you forget to type some text to this post?
--
Herfried K. Wagner
MVP · VB Classic, VB.NET
<http://www.mvps.org/dotnet>
Herfried, Please
No maybe a sign
?
Cor
> If you fail to see sense in my solution, I suggest that you study a
bit more.
Please?
Herfried and Fergus,
Please you both are working for the quality of this newsgroup. And we all
regulars are proud about it that we have such a good newsgroup, without
silly tic tac's .
Sometimes it gives some hard fights to show our ideas and to tell how hard
we stand for it.
But drink after the fight a beer or a wine and say. We both lost and won but
we learned a lot from it.
So let us be proud again.
Cor
* "Cor" <no*@non.com> scripsit: If you fail to see sense in my solution, I suggest that you study a
bit more.
Please?
I won't reply to an unqalified post like that written by Fergus. Fergus
is not able to cope with criticism. He always wants to have the last
word... I try to ignore him in future because he doesn't want to be
part of the community. He has chosen to stand outside it.
--
Herfried K. Wagner
MVP · VB Classic, VB.NET
<http://www.mvps.org/dotnet>
* "Cor" <no*@non.com> scripsit: Please
No maybe a sign
?
It seems that you don't want to hear the facts.
--
Herfried K. Wagner
MVP · VB Classic, VB.NET
<http://www.mvps.org/dotnet>
* "Cor" <no*@non.com> scripsit: Please you both are working for the quality of this newsgroup. And we all
regulars are proud about it that we have such a good newsgroup, without
silly tic tac's .
Sometimes it gives some hard fights to show our ideas and to tell how hard
we stand for it.
But drink after the fight a beer or a wine and say. We both lost and won but
we learned a lot from it.
I am waiting for Fergus to come back. Now he preferrs to stand outside
the community. I am sure he knows that he is welcome, but he needs some
more time to change his habits.
--
Herfried K. Wagner
MVP · VB Classic, VB.NET
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