Module org.apache.jena.arq

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

Class AggregatorBase

java.lang.Object

org.apache.jena.sparql.expr.aggregate.AggregatorBase

All Implemented Interfaces:

Aggregator

Direct Known Subclasses:

AggAvg, AggAvgDistinct, AggCount, AggCountDistinct, AggCountVar, AggCountVarDistinct, AggCustom, AggFoldList, AggFoldMap, AggGroupConcat, AggGroupConcatDistinct, AggMax, AggMaxDistinct, AggMedian, AggMedianDistinct, AggMin, AggMinDistinct, AggMode, AggModeDistinct, 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

Modifier and Type	Method	Description
String	asSparqlExpr(SerializationContext sCxt)	Format as an (extended) SPARQL expression
final Aggregator	copyTransform(NodeTransform transform)
abstract Accumulator	createAccumulator()	Create an accumulator for this aggregator
final boolean	equals(Object other)
ExprList	getExprList()
String	getName()	Get the SPARQL name (COUNT, AVG etc)
org.apache.jena.graph.Node	getValue(Binding key)
abstract org.apache.jena.graph.Node	getValueEmpty()	Value if there are no groups : return null for no result
abstract int	hashCode()
String	key()
String	toPrefixString()
String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.jena.sparql.expr.aggregate.Aggregator

copy, equals

Method Details

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 org.apache.jena.graph.Node getValueEmpty()

Description copied from interface: Aggregator

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

Specified by:

getValueEmpty in interface Aggregator

getValue

public org.apache.jena.graph.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

getExprList

public ExprList getExprList()

Specified by:

getExprList in interface Aggregator

getName

public String getName()

Description copied from interface: Aggregator

Get the SPARQL name (COUNT, AVG etc)

Specified by:

getName in interface Aggregator

toString

public String toString()

Overrides:

toString in class Object

asSparqlExpr

public String asSparqlExpr(SerializationContext sCxt)

Description copied from interface: Aggregator

Format as an (extended) SPARQL expression

Specified by:

asSparqlExpr in interface Aggregator

toPrefixString

public 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 final boolean equals(Object other)

Specified by:

equals in interface Aggregator

Overrides:

equals in class Object