Enforcing adjacent ranges

[Ben Leslie <benno@xxxxxxxxxxx>]

I'm wondering if there is anyway to enforce that ranges in a table be adjacent in perhaps a similar way to enforcing that they are non-overlapping.

Consider a (very simplified table)

CREATE TABLE (
  thing_id int,
  period tsrange,
  EXCLUDE USING gist (thing_id WITH =, period WITH &&),

  CHECK (lower_inc(period) and not upper_inc(period))

);

This should (I believe) enforce that all periods for a given thing are non-overlapping, and that each is lower-inclusive, upper-exclusive ranges.

I'd also like to enforce that all ranges for a given 'thing' are adjacent. 

Is that possible?

Thanks,

Ben