[JIRA] (MDA-231) Add stage to validate selected DOM attributes as strings

[Ian Young (Jira)]

Ian Young ( https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3Ae127cb03-43ed-473d-b6ba-592949cb4be8 ) *commented* on MDA-231 ( https://shibboleth.atlassian.net/browse/MDA-231?atlOrigin=eyJpIjoiZTFkOWI4NTU3M2U2NDZkZGE5ZjYzNzUwMTA3MDQ3ZmYiLCJwIjoiaiJ9 )

Re: Add stage to validate selected DOM attributes as strings ( https://shibboleth.atlassian.net/browse/MDA-231?atlOrigin=eyJpIjoiZTFkOWI4NTU3M2U2NDZkZGE5ZjYzNzUwMTA3MDQ3ZmYiLCJwIjoiaiJ9 )

I have a working version of this now, plus unit tests with good coverage. I still need documentation, and in particular I want to document this one on the wiki to see what that looks like.

I am not completely happy about the implementation and in particular I think the fact that I ended up with a method which implements something from an ancestor class by throwing an UnsupportedOperationException probably indicates that the class hierarchy could be improved, perhaps by putting in yet another intermediate abstract class. This would all be a lot easier in a language that had mixins or another kind of multiple inheritance, but I think there is still a better approach available even in Java.

( https://shibboleth.atlassian.net/browse/MDA-231#add-comment?atlOrigin=eyJpIjoiZTFkOWI4NTU3M2U2NDZkZGE5ZjYzNzUwMTA3MDQ3ZmYiLCJwIjoiaiJ9 ) Add Comment ( https://shibboleth.atlassian.net/browse/MDA-231#add-comment?atlOrigin=eyJpIjoiZTFkOWI4NTU3M2U2NDZkZGE5ZjYzNzUwMTA3MDQ3ZmYiLCJwIjoiaiJ9 )

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