Package org.eclipse.rdf4j.federated.optimizer

Class DefaultFedXCostModel

java.lang.Object

org.eclipse.rdf4j.federated.optimizer.DefaultFedXCostModel

All Implemented Interfaces:

FedXCostModel

public class DefaultFedXCostModel
extends Object
implements FedXCostModel

Default implementation of the FedXCostModel

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
static DefaultFedXCostModel	INSTANCE

Constructor Summary

Constructors

Constructor	Description
DefaultFedXCostModel()

Method Summary

Modifier and Type	Method	Description
double	estimateCost(TupleExpr tupleExpr, Set<String> joinVars)	Return the estimated cost for the given TupleExpr

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

INSTANCE

public static DefaultFedXCostModel INSTANCE

Constructor Details

DefaultFedXCostModel

public DefaultFedXCostModel()

Method Details

estimateCost

public double estimateCost(TupleExpr tupleExpr,
 Set<String> joinVars)

Description copied from interface: FedXCostModel

Return the estimated cost for the given TupleExpr

Specified by:

estimateCost in interface FedXCostModel

Returns:

the cost associated to the tupleExpr