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

Class AggregatorBase

java.lang.Object

com.hp.hpl.jena.sparql.expr.aggregate.AggregatorBase

All Implemented Interfaces:

Aggregator

Direct Known Subclasses:

AggAvg, AggAvgDistinct, AggCount, AggCountDistinct, AggCountVar, AggCountVarDistinct, AggGroupConcat, AggGroupConcatDistinct, AggMax, AggMaxDistinct, AggMin, AggMinDistinct, AggNull, AggSample, AggSampleDistinct, AggSum, AggSumDistinct

public abstract class AggregatorBase
extends Object
implements Aggregator

Aggregate that does everything except the per-group aggregation that is needed for each operation

Method Summary

Methods

Modifier and Type	Method and Description
Aggregator	copyTransform(NodeTransform transform)
abstract Accumulator	createAccumulator() Create an accumulator for this aggregator
abstract boolean	equals(Object other)
Node	getValue(Binding key)
abstract Node	getValueEmpty() Value if there are no elements in any group : return null for no result
abstract int	hashCode()
String	key()
abstract String	toPrefixString()
abstract String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.hp.hpl.jena.sparql.expr.aggregate.Aggregator

copy, getExpr

Method Detail

createAccumulator

public abstract Accumulator createAccumulator()

Description copied from interface: Aggregator

Create an accumulator for this aggregator

Specified by:

createAccumulator in interface Aggregator

getValueEmpty

public abstract Node getValueEmpty()

Description copied from interface: Aggregator

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

Specified by:

getValueEmpty in interface Aggregator

getValue

public Node getValue(Binding key)

key

public String key()

Specified by:

key in interface Aggregator

copyTransform

public final Aggregator copyTransform(NodeTransform transform)

Specified by:

copyTransform in interface Aggregator

toString

public abstract String toString()

Overrides:

toString in class Object

toPrefixString

public abstract String toPrefixString()

Specified by:

toPrefixString in interface Aggregator

hashCode

public abstract int hashCode()

Specified by:

hashCode in interface Aggregator

Overrides:

hashCode in class Object

equals

public abstract boolean equals(Object other)

Specified by:

equals in interface Aggregator

Overrides:

equals in class Object