Sesam Catalogue search need functionality to have catalogue queries
with geographical criteria "expand" to a wider area when there are no
hits. E.g. searching for "marina torshov" would expand to "marina oslo".
When there are no hits, Fast returns a suggested new transformed query
based on synonyms, in this case the suggestion would be just "oslo", and
Fast could also re-run the new query automatically after a change of
config. However, changing the query and re-run in java would would give
better control over what happens.
The method CatalogueSearchCommand.execute() seems to be a good place to
start. This method calls AbstractSimpleFastSearchCommand.execute() which
performs the actual call to Fast. The result is then "collected" and
returned to CatalogeSearchCommand.execute(). Depending on modes.xml
various parts of the Fast result is parsed and passed along. Turning on
the relevant-queries=true flag in modes.xml will trigger
AbstractFastSearchCommand.collectRelevantQueries(), and this will
attempt to collect the synonym query, based on the fact that it is named
"FastQT_Synonym" and has messageID=8. However the query value string is
assumed to be more complex than just "oslo", and the parsing throws an
ArrayIndexOutOfBoundsException when it tries to parse and store the
value in a BasicWeightedSuggestion.
I guess this specific kind of synonym transform will never need to put a
weight on the suggestions, due to the hierarchical structure of
geo-areas. So I would like to add a new collect method ...
collectSimpleRelevantQueries or something ... but then I'd need more
fine-grained criteria to separate "SimpleRelevantQuerues" from the other
"RelevantQueres". I also need to know what collectRelevantQueries()
actually is intended to do so that I don't interfer with that
functionality.
Does anyone know more about this, or have any pointers to relevant docs?
--
martin s.
Sesam Media AS
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