Package org.apache.lucene.queries.function.valuesource

Class DocFreqValueSource

java.lang.Object

org.apache.lucene.queries.function.ValueSource

org.apache.lucene.queries.function.valuesource.DocFreqValueSource

Direct Known Subclasses:

IDFValueSource, TermFreqValueSource

public class DocFreqValueSource
extends ValueSource

DocFreqValueSource returns the number of documents containing the term.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field	Description
protected String	field
protected BytesRef	indexedBytes
protected String	indexedField
protected String	val

Constructor Summary

Constructors

Constructor	Description
DocFreqValueSource(String field, String val, String indexedField, BytesRef indexedBytes)

Method Summary

Modifier and Type	Method	Description
void	createWeight(Map<Object,Object> context, IndexSearcher searcher)	Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context.
String	description()	description of field, used in explain()
boolean	equals(Object o)
FunctionValues	getValues(Map<Object,Object> context, LeafReaderContext readerContext)	Gets the values for this reader and the context that was previously passed to createWeight().
int	hashCode()
String	name()

Methods inherited from class org.apache.lucene.queries.function.ValueSource

asDoubleValuesSource, asLongValuesSource, fromDoubleValuesSource, getSortField, newContext, toString

Methods inherited from class java.lang.Object

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

Field Detail

field

protected final String field

indexedField

protected final String indexedField

val

protected final String val

indexedBytes

protected final BytesRef indexedBytes

Constructor Detail

DocFreqValueSource

public DocFreqValueSource(String field,
                          String val,
                          String indexedField,
                          BytesRef indexedBytes)

Method Detail

name

public String name()

description

public String description()

Description copied from class: ValueSource

description of field, used in explain()

Specified by:

description in class ValueSource

getValues

public FunctionValues getValues(Map<Object,Object> context,
                                LeafReaderContext readerContext)
                         throws IOException

Description copied from class: ValueSource

Gets the values for this reader and the context that was previously passed to createWeight(). The values must be consumed in a forward docID manner, and you must call this method again to iterate through the values again.

Specified by:

getValues in class ValueSource

Throws:

IOException

createWeight

public void createWeight(Map<Object,Object> context,
                         IndexSearcher searcher)
                  throws IOException

Description copied from class: ValueSource

Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context. The context object will be passed to getValues() where this info can be retrieved.

Overrides:

createWeight in class ValueSource

Throws:

IOException

hashCode

public int hashCode()

Specified by:

hashCode in class ValueSource

equals

public boolean equals(Object o)

Specified by:

equals in class ValueSource