Brandon Sloane had suggested the following on the wiki
Our service provider only offers a lookup function. We might also want it to
offer a way of querying a list of all defined functions.
I like the idea as it can be used to access all the function classes of each
provider without actually instantiating them as the lookup functions do.
A simple way to achieve this would be for each UDF provider to have a static
Class<?> array field with all the function classes it supports.
It'd have something like the below in its constructor where FunA & FuncB are
the function classes it supports.
super.setFunctionClasses( new Class<?>[] { FuncA.class, FuncB.class } );
Each of these classes can in turn have annotations that identify their name and
namespace. So calling the getter on this field would give our service loader
access to all the function classses supported, as well the relevant metadata on
them. Thoughts?
On 9/6/19 10:30 AM, Kilo, Olabusayo wrote:
I'm requesting a discussion on the addition of the User Defined Functions
capability to daffodil. The proposal referenced below provides a possible
solution for Daffodil to be able to process and use User Defined Functions
referenced in the DFDL Schema.
The original request can be found at
https://issues.apache.org/jira/browse/DAFFODIL-2186 and the proposal can be
found
https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+User+Defined+Functions.
--
Best Regards
Lola K.
