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From Christopher Tignor <ctig...@thinkmap.com>
Subject customized SpanQuery Payload usage
Date Tue, 24 Nov 2009 14:56:19 GMT
Hello,

For certain span queries I construct problematically by piecing together my
own SpanTermQueries I would like to enforce that Payload data is not
returned for matches on those specific terms used by the constituent
SapnTermQueries.

For exmaple if I search for a position match with a SpanQuery referencing
the tokens "_n" and "work" and there is Payload data for each (there needs
to be for other types of queries) I would like to be able to screen out the
payload data originating from any matched "_n" tokens.

I thought for the tokens I am not interested in receiving payload data from
I might simply create (anonymously) my own subclass of SpanTermQuery which
overrides getSpans and returns another custom class which extends TermSpans
but there simply overrides isPayloadAvailable to return false:

new SpanTermQuery(new Term(myField, myTokenString)) {



                                public Spans getSpans(IndexReader reader)
                                        throws IOException {
                                    return new
TermSpans(reader.termPositions(term), term) {

                                        public boolean isPayloadAvailable()
{
                                            return false;
                                        }

                                    };
                                }
                            });

This however seems to eliminating payload data for all matches though I'm
not sure why and am tracing through the code, looking at NearSpansUnordered.

Any thoughts?

thanks so much,

C>T>


-- 
TH!NKMAP

Christopher Tignor | Senior Software Architect
155 Spring Street NY, NY 10012
p.212-285-8600 x385 f.212-285-8999

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