>> Now I notice (from googling) that I can also downcast TermFreqVector >> to TermPositionVector, which contains the offsets (which I will need). >> >> So -- under what conditions would that cast fail? > >The cast fails if you had indexed the field with Field.TermVector.YES, >which does not store positions nor offsets information. If you always >index the field with TermVector.WITH_OFFSET, WITH_POSITIONS or >WITH_POSITIONS_OFFSETS, the cast will always succeed. > OK, cool.
I see in the javadocs for TermPositionVector that it "not necessarily contains both positions and offsets, but at least one of these arrays exists"; does it work like this, I think: TermVector.WITH_OFFSETS => TermVectorOffsetInfo[] always exists (so far, works for me) TermVector.WITH_POSITIONS => positions int[] always exists TermVector.WITH_POSITIONS_OFFSETS => both arrays always exist Right? And I guess the reason for using TermVector.WITH_POSITIONS => positions int[] is that it has a smaller memory footprint? thanks, Paul --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
