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See:
Description
Class Summary | |
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AnalyzerUtil | Various fulltext analysis utilities avoiding redundant code in several classes. |
SynExpand | Expand a query by looking up synonyms for every term. |
SynLookup | Test program to look up synonyms. |
SynonymMap | Loads the WordNet prolog file wn_s.pl into a thread-safe main-memory hash map that can be used for fast high-frequency lookups of synonyms for any given (lowercase) word string. |
SynonymTokenFilter | Injects additional tokens for synonyms of token terms fetched from the underlying child stream; the child stream must deliver lowercase tokens for synonyms to be found. |
Syns2Index | Convert the prolog file wn_s.pl from the WordNet prolog download
into a Lucene index suitable for looking up synonyms and performing query expansion (SynExpand.expand(...) ). |
This package uses synonyms defined by WordNet. There are two methods: query expansion and analysis. Both methods first require you to download the WordNet prolog database Inside this archive is a file named wn_s.pl, which contains the WordNet synonyms.
Syns2Index
once to build the query index/"database", and then call
SynExpand.expand(...)
to expand a query.
TokenStream
.
SynonymMap
, passing in the path to wn_s.pl
SynonymTokenFilter
to your analyzer. Note: SynonymTokenFilter should be after LowerCaseFilter,
because it expects terms to already be in lowercase.
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