DefaultFedXCostModel (Eclipse RDF4J 4.3.2)

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

All Methods Instance Methods Concrete Methods
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 Detail
  - INSTANCE
```
public static DefaultFedXCostModel INSTANCE
```
- Constructor Detail
  - DefaultFedXCostModel
```
public DefaultFedXCostModel()
```
- Method Detail
  - 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