There isn't a very clean way to do this just yet, but it is doable.
Index with positions (you might find offsets useful too) and then use
the TermVectorMapper and TermVector API call on the IndexReader (not
the termPositions). Then, you will need to implement a
TermVectorMapper that takes in your position and then reads in the
term vector and gets just those positions around the interested
position. Once you are outside of your window, you can then short
circuit out of the TermVM (I think).
HTH,
Grant
On May 3, 2009, at 2:39 PM, Adrian Dimulescu wrote:
Hello,
I am post-processing a positional index -- with a field like the
following:
doc.add(new Field(Constants.FIELD_TEXT, txt, Store.NO,
Index.ANALYZED, TermVector.WITH_POSITIONS));
At post-processing, I want to retrieve the neighbours of a given
term within a given range. That is, if document x contains the
sequence :
"Alabama experienced significant /recovery as the economy of the
state/ transitioned from agriculture to diversified interests in
heavy manufacturing"
for range = 3 and term = "economy", I want to retrieve "recovery as
the *economy* of the state".
I see there is an API call :
IndexReader.termPositions(term)
which retrieves the actual positions of the given term. Is there a
quick way to retrieve its neighbours too, instead of browsing all
terms for all document and see if their position is close to the
position of the central term ?
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Grant Ingersoll
http://www.lucidimagination.com/
Search the Lucene ecosystem (Lucene/Solr/Nutch/Mahout/Tika/Droids)
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