Package org.elasticsearch.index.query.functionscore

Class RandomScoreFunctionBuilder

java.lang.Object

org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder<RandomScoreFunctionBuilder>

org.elasticsearch.index.query.functionscore.RandomScoreFunctionBuilder

All Implemented Interfaces:

NamedWriteable, Writeable, org.elasticsearch.xcontent.ToXContent, org.elasticsearch.xcontent.ToXContentFragment

public class RandomScoreFunctionBuilder
extends ScoreFunctionBuilder<RandomScoreFunctionBuilder>

A function that computes a random score for the matched documents

Nested Class Summary

Nested classes/interfaces inherited from interface org.elasticsearch.xcontent.ToXContent

org.elasticsearch.xcontent.ToXContent.DelegatingMapParams, org.elasticsearch.xcontent.ToXContent.MapParams, org.elasticsearch.xcontent.ToXContent.Params

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Field Summary

Fields

Modifier and Type	Field	Description
static final String	NAME

Fields inherited from interface org.elasticsearch.xcontent.ToXContent

EMPTY_PARAMS

Constructor Summary

Constructors

Constructor	Description
RandomScoreFunctionBuilder()
RandomScoreFunctionBuilder(StreamInput in)	Read from a stream.

Method Summary

Modifier and Type	Method	Description
protected boolean	doEquals(RandomScoreFunctionBuilder functionBuilder)	Check that two instances of the same subclass of ScoreFunctionBuilder are equal.
protected int	doHashCode()	Hashcode for fields defined in this subclass of ScoreFunctionBuilder.
protected ScoreFunction	doToFunction(SearchExecutionContext context)	Build the Lucene ScoreFunction for this builder.
protected void	doWriteTo(StreamOutput out)	Write the subclass's components into the stream.
void	doXContent(org.elasticsearch.xcontent.XContentBuilder builder, org.elasticsearch.xcontent.ToXContent.Params params)	Convert this subclass's data into XContent.
static RandomScoreFunctionBuilder	fromXContent(org.elasticsearch.xcontent.XContentParser parser)
String	getField()	Get the field to use for random number generation.
String	getName()	The name of this score function.
Integer	getSeed()
RandomScoreFunctionBuilder	seed(int seed)	Sets the seed based on which the random number will be generated.
RandomScoreFunctionBuilder	seed(long seed)	seed variant taking a long value.
RandomScoreFunctionBuilder	seed(String seed)	seed variant taking a String value.
RandomScoreFunctionBuilder	setField(String field)	Set the field to be used for random number generation.

Methods inherited from class org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder

equals, getWeight, getWriteableName, hashCode, setWeight, toFunction, toXContent, writeTo

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.elasticsearch.xcontent.ToXContentFragment

isFragment

Field Details

NAME

public static final String NAME

See Also:

• Constant Field Values

Constructor Details

RandomScoreFunctionBuilder

public RandomScoreFunctionBuilder()

RandomScoreFunctionBuilder

public RandomScoreFunctionBuilder(StreamInput in)
                           throws IOException

Read from a stream.

Throws:

IOException

Method Details

doWriteTo

protected void doWriteTo(StreamOutput out)
                  throws IOException

Description copied from class: ScoreFunctionBuilder

Write the subclass's components into the stream.

Specified by:

doWriteTo in class ScoreFunctionBuilder<RandomScoreFunctionBuilder>

Throws:

IOException

getName

public String getName()

Description copied from class: ScoreFunctionBuilder

The name of this score function.

Specified by:

getName in class ScoreFunctionBuilder<RandomScoreFunctionBuilder>

seed

public RandomScoreFunctionBuilder seed(int seed)

Sets the seed based on which the random number will be generated. Using the same seed is guaranteed to generate the same random number for a specific doc.

Parameters:

seed - The seed.

seed

public RandomScoreFunctionBuilder seed(long seed)

seed variant taking a long value.

See Also:

• seed(int)

seed

public RandomScoreFunctionBuilder seed(String seed)

seed variant taking a String value.

See Also:

• seed(int)

getSeed

public Integer getSeed()

setField

public RandomScoreFunctionBuilder setField(String field)

Set the field to be used for random number generation. This parameter is compulsory when a seed is set and ignored otherwise. Note that documents that have the same value for a field will get the same score.

getField

public String getField()

Get the field to use for random number generation.

See Also:

• setField(String)

doXContent

public void doXContent(org.elasticsearch.xcontent.XContentBuilder builder,
 org.elasticsearch.xcontent.ToXContent.Params params)
                throws IOException

Description copied from class: ScoreFunctionBuilder

Convert this subclass's data into XContent.

Specified by:

doXContent in class ScoreFunctionBuilder<RandomScoreFunctionBuilder>

Throws:

IOException

doEquals

protected boolean doEquals(RandomScoreFunctionBuilder functionBuilder)

Description copied from class: ScoreFunctionBuilder

Check that two instances of the same subclass of ScoreFunctionBuilder are equal. Implementers don't need to check any fields in ScoreFunctionBuilder, just fields that they define.

Specified by:

doEquals in class ScoreFunctionBuilder<RandomScoreFunctionBuilder>

doHashCode

protected int doHashCode()

Description copied from class: ScoreFunctionBuilder

Hashcode for fields defined in this subclass of ScoreFunctionBuilder. Implementers should ignore fields defined in ScoreFunctionBuilder because they will already be in the hashCode.

Specified by:

doHashCode in class ScoreFunctionBuilder<RandomScoreFunctionBuilder>

doToFunction

protected ScoreFunction doToFunction(SearchExecutionContext context)

Description copied from class: ScoreFunctionBuilder

Build the Lucene ScoreFunction for this builder. Implementers should ignore things defined in ScoreFunctionBuilder like weight as they will be handled by the function that calls this one.

Specified by:

doToFunction in class ScoreFunctionBuilder<RandomScoreFunctionBuilder>

fromXContent

public static RandomScoreFunctionBuilder fromXContent(org.elasticsearch.xcontent.XContentParser parser)
                                               throws IOException,
ParsingException

Throws:

IOException

ParsingException