com.hp.hpl.jena.sparql.expr.aggregate
Interface Aggregator

All Known Implementing Classes:

AggAvg, AggAvgDistinct, AggCount, AggCountDistinct, AggCountVar, AggCountVarDistinct, AggGroupConcat, AggGroupConcatDistinct, AggMax, AggMaxDistinct, AggMin, AggMinDistinct, 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

void	accumulate(BindingKey key, Binding b, FunctionEnv functionEnv)
Aggregator	copy(Expr expr)
Aggregator	copyTransform(NodeTransform transform)
boolean	equals(Object other)
Expr	getExpr() Get the expression - may be null (e.g COUNT(*)) ;
com.hp.hpl.jena.graph.Node	getValue(BindingKey key)
com.hp.hpl.jena.graph.Node	getValueEmpty() Value if there are no elements in any group : return null for no result
int	hashCode()
String	key()
String	toPrefixString()

Method Detail

accumulate

void accumulate(BindingKey key,
                Binding b,
                FunctionEnv functionEnv)

getValue

com.hp.hpl.jena.graph.Node getValue(BindingKey key)

getValueEmpty

com.hp.hpl.jena.graph.Node getValueEmpty()

Value if there are no elements in any group : return null for no result

toPrefixString

String toPrefixString()

key

String key()

getExpr

Expr getExpr()

Get the expression - may be null (e.g COUNT(*)) ;

copy

Aggregator copy(Expr expr)

copyTransform

Aggregator copyTransform(NodeTransform transform)

hashCode

int hashCode()

Overrides:

hashCode in class Object

equals

boolean equals(Object other)

Overrides:

equals in class Object