Package org.apache.jena.sparql.expr.aggregate

Interface Aggregator

All Known Implementing Classes:

AggAvg, AggAvgDistinct, AggCount, AggCountDistinct, AggCountVar, AggCountVarDistinct, AggCustom, AggGroupConcat, AggGroupConcatDistinct, AggMax, AggMaxDistinct, AggMedian, AggMedianDistinct, AggMin, AggMinDistinct, AggMode, AggModeDistinct, AggNull, AggregatorBase, AggSample, AggSampleDistinct, AggSum, AggSumDistinct

public interface Aggregator

An Aggregator is the processor for the whole result stream. BindingKeys identify which section of a group we're in.

Method Summary

Modifier and Type	Method	Description
java.lang.String	asSparqlExpr(SerializationContext sCxt)	Format as an (extended) SPARQL expression
Aggregator	copy(ExprList exprs)
Aggregator	copyTransform(NodeTransform transform)
Accumulator	createAccumulator()	Create an accumulator for this aggregator
boolean	equals(java.lang.Object other)
boolean	equals(Aggregator other, boolean bySyntax)	Consider this 'protected'
ExprList	getExprList()
java.lang.String	getName()	Get the SPARQL name (COUNT, AVG etc)
Node	getValueEmpty()	Value if there are no groups : return null for no result
int	hashCode()
java.lang.String	key()
java.lang.String	toPrefixString()

Method Detail

createAccumulator

Accumulator createAccumulator()

Create an accumulator for this aggregator

getValueEmpty

Node getValueEmpty()

Value if there are no groups : return null for no result

toPrefixString

java.lang.String toPrefixString()

key

java.lang.String key()

getName

java.lang.String getName()

Get the SPARQL name (COUNT, AVG etc)

getExprList

ExprList getExprList()

copy

Aggregator copy(ExprList exprs)

copyTransform

Aggregator copyTransform(NodeTransform transform)

hashCode

int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

equals

boolean equals(Aggregator other,
               boolean bySyntax)

Consider this 'protected'

asSparqlExpr

java.lang.String asSparqlExpr(SerializationContext sCxt)

Format as an (extended) SPARQL expression