gate.creole.annic.apache.lucene.search

Interface Weight

All Superinterfaces:

Serializable

public interface Weight
extends Serializable

Expert: Calculate query weights and build query scorers.

A Weight is constructed by a query, given a Searcher (Query.createWeight(Searcher)). The sumOfSquaredWeights() method is then called on the top-level query to compute the query normalization factor (@link Similarity#queryNorm(float)}). This factor is then passed to normalize(float). At this point the weighting is complete and a scorer may be constructed by calling scorer(IndexReader, Searcher).

Method Summary

Modifier and Type	Method and Description
Explanation	explain(IndexReader reader, int doc) An explanation of the score computation for the named document.
Query	getQuery() The query that this concerns.
float	getValue() The weight for this query.
void	normalize(float norm) Assigns the query normalization factor to this.
Scorer	scorer(IndexReader reader, Searcher searcher) Constructs a scorer for this.
float	sumOfSquaredWeights() The sum of squared weights of contained query clauses.

Method Detail

getQuery

Query getQuery()

The query that this concerns.

getValue

float getValue()

The weight for this query.

sumOfSquaredWeights

float sumOfSquaredWeights()
                   throws IOException

The sum of squared weights of contained query clauses.

Throws:

IOException

normalize

void normalize(float norm)

Assigns the query normalization factor to this.

scorer

Scorer scorer(IndexReader reader,
              Searcher searcher)
       throws IOException

Constructs a scorer for this.

Throws:

IOException

explain

Explanation explain(IndexReader reader,
                    int doc)
             throws IOException

An explanation of the score computation for the named document.

Throws:

IOException