Hi,
It was correctly pointed out to me that I had posted this to the wrong list
(sorry about that folks!). So, I am posting this here in the hopes that
some of you can help me:
I have a couple of basic questions (I have only started using STRUTS, so if
this is obvious please slap some links at me and send me on my way :-) ):
Which object type are people having their Action's send into their business
and/or data layers: ones that derive from ActionForm or ones that implement
the Value Object pattern? And how are they converting the business and/or
data layer's response back (into Action Forms? or are you sending back the
Value Object so that the custom tags can use that?).
My initial feeling on this was to only send Value Objects to the business
and data layers so that they would not get coupled to what is obviously a
presentation layer object (I saw Actions as bridges between the layers,
converting between the Action Forms and Value Objects and back again). The
problem I hit was that I did not want to have to write a bunch of
conversion code (see below) to create my Value Object (since it is
immutable and, hence does not have the setValue(object) methods that
automatic JavaBean conversion utilities need):
MyValueObject val = new
MyValueObject(converter.convert(form.getValue(), typeOfConversion));
Where the above code would take the String value from an ActionForm,
convert it into the type needed, and pass it into the constructor for the
Value Object. Hit the same problem running back the other way (from Value
Objects to Action Forms).
OR are people making their value objects mutable and maybe having them
implement a read-only interface that the business and data layers use when
interacting with or returning the object?
OR are people passing in the ActionForm to the Value Object so that it can
extract what it needs (are you fronting it with an interface?)?
OR are people passing in a map of properties and their values to the Value
Object for it to pick and choose what it wants?
OR something else entirely...?
When you are going back from Value Object to Action Form, how are you
controlling the output format? I know that the Action needs to understand
the format of the data that it would expect to receive from a submitted
form... So, I am assuming that all formatting has to happen before it gets
to the custom tag (the only exception being when it is writing data that
will not come back through a form or query string). Is this what people are
doing?
Thanks!
Allen
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