[fdo-internals] RFC15 posted

[Maksim Sestic]

Hi Orest, 

I already included some textual description, UML diagram (with
properties/methods) still to come.

Dictionary is another story. It seems that present implementation of
DictionaryElement (building block of DictionaryElementCollection, which, I
guess, ressembles to generic FDO Dictionary) has following definition:

  OSGeo::FDO:Common:DictionaryElement (System::String *name, System::String
*value) 

This is a bit tricky in the light of FdoPropertyValueConstraintDictionary
since dictionary key is a String, while FdoPropertyValue may be of any
(reasonable) FDO type for that matter. I guess it would take few additional
generic dictionary elements with different Key types (Short... Int16,
Int32... Double... etc). Term "name" used for DictionaryElement parameter is
not appropriate - term "key" is somehow more suitable.

It seems that DictionaryElement and DictionaryElementCollection classes may
undergo major reconstruction :-) for FdoPropertyValueConstraintDictionary to
work. Orest, I don't know whether FDO developers prefer property overloading
(easier, but introduces possible type narrowing) over class inheritance (bit
more coding) to achieve this?

Regards,
Maksim Sestic



Orest Halustchak wrote:
> 
> One idea is to post your UML design and ask for help to define the fdo
> interfaces for that design. You could also have a look at the current
> interfaces FdoPropertyValueConstraint, FdoPropertyValueConstraintList, and
> FdoPropertyValueConstraingRange to get an idea of what your interfaces
> might look like. Your interface should inherit from
> FdoPropertyValueConstraint.
> 
> Re: Dictionary: Did you have a look at FdoDictionary, which inherits from
> FdoNamedCollection?
> 
> In terms of referencing another class, take into account that you would
> need also to reference the properties of that class.
> 
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