extend

Create an IntervalsSource that wraps another source, extending its intervals by a number of positions before and after.

This can be useful for adding defined gaps in a block query; for example, to find 'a b [2 arbitrary terms] c', you can call:

Intervals.phrase(Intervals.term("a"), Intervals.extend(Intervals.term("b"), 0, 2), Intervals.term("c"));

Note that calling IntervalIterator.gaps on iterators returned by this source delegates directly to the wrapped iterator, and does not include the extensions.

Parameters