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Querqy library for query rewriting for Lucene
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package querqy.lucene.rewrite.prms;
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
/**
* A query in the 'Probabilistic Retrieval Model for Semi-structured Data'
*
* @author rene
*
*/
public interface PRMSQuery {
PRMSQuery NEVER_MATCH_PRMS_QUERY = indexReader -> 0.0;
/**
* Calculate the probability of this query for a given index
*
* @param indexReader The IndexReader
* @return The probability of this query
* @throws IOException In case of an error when reading from the index
*/
double calculateLikelihood(IndexReader indexReader) throws IOException;
}