Package org.apache.lucene.search

Class BM25FQuery.Builder

java.lang.Object

org.apache.lucene.search.BM25FQuery.Builder

Enclosing class:

BM25FQuery

public static class BM25FQuery.Builder
extends Object

A builder for BM25FQuery.

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<String,BM25FQuery.FieldAndWeight>	fieldAndWeights
private final BM25Similarity	similarity
private final Set<BytesRef>	termsSet

Constructor Summary

Constructors

Constructor	Description
Builder()	Default builder.
Builder(float k1, float b)	Builder with the supplied parameter values.

Method Summary

Modifier and Type	Method	Description
BM25FQuery.Builder	addField(String field)	Adds a field to this builder.
BM25FQuery.Builder	addField(String field, float weight)	Adds a field to this builder.
BM25FQuery.Builder	addTerm(BytesRef term)	Adds a term to this builder.
BM25FQuery	build()	Builds the BM25FQuery.

Methods inherited from class java.lang.Object

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

Field Details

similarity

private final BM25Similarity similarity

fieldAndWeights

private final Map<String,BM25FQuery.FieldAndWeight> fieldAndWeights

termsSet

private final Set<BytesRef> termsSet

Constructor Details

Builder

public Builder()

Default builder.

Builder

public Builder(float k1,
 float b)

Builder with the supplied parameter values.

Parameters:

k1 - Controls non-linear term frequency normalization (saturation).

b - Controls to what degree document length normalizes tf values.

Method Details

addField

public BM25FQuery.Builder addField(String field)

Adds a field to this builder.

Parameters:

field - The field name.

addField

public BM25FQuery.Builder addField(String field,
 float weight)

Adds a field to this builder.

Parameters:

field - The field name.

weight - The weight associated to this field.

addTerm

public BM25FQuery.Builder addTerm(BytesRef term)

Adds a term to this builder.

build

public BM25FQuery build()

Builds the BM25FQuery.