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

Class ComparisonBoolFunction

java.lang.Object

org.apache.lucene.queries.function.ValueSource

org.apache.lucene.queries.function.valuesource.BoolFunction

org.apache.lucene.queries.function.valuesource.ComparisonBoolFunction

public abstract class ComparisonBoolFunction
extends BoolFunction

Base class for comparison operators useful within an "if"/conditional.

Constructor Summary

Constructors

Constructor	Description
ComparisonBoolFunction(ValueSource lhs, ValueSource rhs, String name)

Method Summary

Modifier and Type	Method	Description
abstract boolean	compare(int doc, FunctionValues lhs, FunctionValues rhs)	Perform the comparison, returning true or false
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()	Uniquely identify the operation (ie "gt", "lt" "gte", etc)

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

Constructor Detail

ComparisonBoolFunction

public ComparisonBoolFunction(ValueSource lhs,
                              ValueSource rhs,
                              String name)

Method Detail

compare

public abstract boolean compare(int doc,
                                FunctionValues lhs,
                                FunctionValues rhs)
                         throws IOException

Perform the comparison, returning true or false

Throws:

IOException

name

public String name()

Uniquely identify the operation (ie "gt", "lt" "gte", etc)

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

equals

public boolean equals(Object o)

Specified by:

equals in class ValueSource

hashCode

public int hashCode()

Specified by:

hashCode in class ValueSource

description

public String description()

Description copied from class: ValueSource

description of field, used in explain()

Specified by:

description in class ValueSource

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