Package org.apache.lucene.expressions

Class ExpressionRescorer

java.lang.Object

org.apache.lucene.search.Rescorer

org.apache.lucene.search.SortRescorer

org.apache.lucene.expressions.ExpressionRescorer

class ExpressionRescorer
extends SortRescorer

A Rescorer that uses an expression to re-score first pass hits. Functionally this is the same as SortRescorer (if you build the Sort using Expression.getSortField(org.apache.lucene.expressions.Bindings, boolean)), except for the explain method which gives more detail by showing the value of each variable.

Field Summary

Fields

Modifier and Type	Field	Description
private Bindings	bindings
private Expression	expression

Constructor Summary

Constructors

Constructor	Description
ExpressionRescorer(Expression expression, Bindings bindings)	Uses the provided Expression to assign second pass scores.

Method Summary

Modifier and Type	Method	Description
Explanation	explain(IndexSearcher searcher, Explanation firstPassExplanation, int docID)	Explains how the score for the specified document was computed.
private static DoubleValues	scores(int doc, float score)

Methods inherited from class org.apache.lucene.search.SortRescorer

rescore

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

expression

private final Expression expression

bindings

private final Bindings bindings

Constructor Detail

ExpressionRescorer

public ExpressionRescorer(Expression expression,
                          Bindings bindings)

Uses the provided Expression to assign second pass scores.

Method Detail

scores

private static DoubleValues scores(int doc,
                                   float score)

explain

public Explanation explain(IndexSearcher searcher,
                           Explanation firstPassExplanation,
                           int docID)
                    throws java.io.IOException

Description copied from class: Rescorer

Explains how the score for the specified document was computed.

Overrides:

explain in class SortRescorer

Throws:

java.io.IOException