Mulgara

Back in the distant past when the only type of Constraint supported was what we now refer to as [[ConstraintImpl]], getElement() was an ugly, but harmless way of obtaining the different elements of a constraint.
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Now that we have dozens of different constraint types, the vast majority of which have to implement getElement() by throwing an exception, this is not so harmless.
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It would be great if someone could go through the codebase and:
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1) Add getSubject(), getPredicate(), and getObject() to [[ConstraintImpl]]
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2) Find each call to [[ConstraintImpl]]::getElement(), and replace with the appropriate call (element 0-&gt;subject, 1-&gt;predicate, 2-&gt;object; 3-&gt;model but that should already have been done).
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3) Repeat for [[ConstraintNegation]] (and any other constraint type that implements getElement(), but IIRC there aren't any).
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4) Remove getElement() from the Constraint interface and implementing classes thereby banishing this aberration.