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org.apache.lucene.wordnet.package.html Maven / Gradle / Ivy

    




    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. 
    
    
Query Expansion Method
    This method creates Lucene index storing the synonyms, which in turn can be used for query expansion.

    You normally run {@link org.apache.lucene.wordnet.Syns2Index} once to build the query index/"database", and then call
    {@link org.apache.lucene.wordnet.SynExpand#expand SynExpand.expand(...)} to expand a query.

    


	
 Instructions 
	

	
 Invoke Syn2Index as appropriate to build a synonym index.
	    It'll take 2 arguments, the path to wn_s.pl from the WordNet download, and the index name.
   
	 
 Update your UI so that as appropriate you call SynExpand.expand(...) to expand user queries with synonyms.
       
    
    
Analysis Method
    This method injects additional synonym tokens for tokens from a child {@link org.apache.lucene.analysis.TokenStream}.
    
    
 Instructions 
    

    	
Create a {@link org.apache.lucene.wordnet.SynonymMap}, passing in the path to wn_s.pl
    	
Add a {@link org.apache.lucene.wordnet.SynonymTokenFilter} to your analyzer. Note: SynonymTokenFilter should be after LowerCaseFilter, 
    	because it expects terms to already be in lowercase.