I'm writing a TokenFilter and am confused about why class Token has
both an *endOffset* and a *termLength* field. It would appear that
the following invariant should always hold for a Token instance:
termLength() == endOffset() - startOffset()
If so, then
1) Why 2 fields, instead of 1?
2) Why isn't the invariant enforced in the class?
-Babak
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