org.eclipse.rdf4j.query.algebra.evaluation.impl

Class EvaluationStatistics.CardinalityCalculator

java.lang.Object

org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor<RuntimeException>

org.eclipse.rdf4j.query.algebra.evaluation.impl.EvaluationStatistics.CardinalityCalculator

All Implemented Interfaces:

QueryModelVisitor<RuntimeException>

Direct Known Subclasses:

TupleFunctionEvaluationStatistics.TupleFunctionCardinalityCalculator

Enclosing class:

EvaluationStatistics

protected static class EvaluationStatistics.CardinalityCalculator
extends AbstractQueryModelVisitor<RuntimeException>

Field Summary

Fields

Modifier and Type	Field and Description
protected double	cardinality

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CardinalityCalculator()

Method Summary

Modifier and Type	Method and Description
protected int	countConstantVars(Iterable<Var> vars)
double	getCardinality()
protected double	getCardinality(double varCardinality, Collection<Var> vars)
protected double	getCardinality(double varCardinality, Var var)
protected double	getCardinality(StatementPattern sp)
protected double	getContextCardinality(StatementPattern sp) Override this if you are able to determine the cardinality based not only on the contextVar itself but also the other vars (e.g.
protected double	getContextCardinality(Var var)
protected double	getObjectCardinality(StatementPattern sp) Override this if you are able to determine the cardinality based not only on the objectVar itself but also the other vars (e.g.
protected double	getObjectCardinality(Var var)
protected double	getPredicateCardinality(StatementPattern sp) Override this if you are able to determine the cardinality based not only on the predicateVar itself but also the other vars (e.g.
protected double	getPredicateCardinality(Var var)
protected double	getSubjectCardinality(StatementPattern sp) Override this if you are able to determine the cardinality based not only on the subjectVar itself but also the other vars (e.g.
protected double	getSubjectCardinality(Var var)
void	meet(ArbitraryLengthPath node)
void	meet(BindingSetAssignment node)
void	meet(EmptySet node)
void	meet(Join node)
void	meet(LeftJoin node)
void	meet(Service node)
void	meet(SingletonSet node)
void	meet(StatementPattern sp)
void	meet(ZeroLengthPath node)
protected void	meetBinaryTupleOperator(BinaryTupleOperator node) Method called by all meet methods with a BinaryTupleOperator node as argument.
protected void	meetExternalSet(ExternalSet node)
protected void	meetNode(QueryModelNode node) Method called by all of the other meet methods that are not overridden in subclasses.
protected void	meetUnaryTupleOperator(UnaryTupleOperator node) Method called by all meet methods with a UnaryTupleOperator node as argument.

Methods inherited from class org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor

meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meetBinaryValueOperator, meetCompareSubQueryValueOperator, meetNAryValueOperator, meetOther, meetSubQueryValueOperator, meetUnaryValueOperator, meetUpdateExpr

Methods inherited from class java.lang.Object

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

Field Detail

cardinality

protected double cardinality

Constructor Detail

CardinalityCalculator

protected CardinalityCalculator()

Method Detail

getCardinality

public double getCardinality()

meet

public void meet(EmptySet node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(SingletonSet node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(BindingSetAssignment node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(ZeroLengthPath node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(ArbitraryLengthPath node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(Service node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(StatementPattern sp)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

getCardinality

protected double getCardinality(StatementPattern sp)

getSubjectCardinality

protected double getSubjectCardinality(StatementPattern sp)

Override this if you are able to determine the cardinality based not only on the subjectVar itself but also the other vars (e.g. the predicate value might determine a subject subset).

getSubjectCardinality

protected double getSubjectCardinality(Var var)

getPredicateCardinality

protected double getPredicateCardinality(StatementPattern sp)

Override this if you are able to determine the cardinality based not only on the predicateVar itself but also the other vars (e.g. the subject value might determine a predicate subset).

getPredicateCardinality

protected double getPredicateCardinality(Var var)

getObjectCardinality

protected double getObjectCardinality(StatementPattern sp)

Override this if you are able to determine the cardinality based not only on the objectVar itself but also the other vars (e.g. the predicate value might determine an object subset).

getObjectCardinality

protected double getObjectCardinality(Var var)

getContextCardinality

protected double getContextCardinality(StatementPattern sp)

Override this if you are able to determine the cardinality based not only on the contextVar itself but also the other vars (e.g. the subject value might determine a context subset).

getContextCardinality

protected double getContextCardinality(Var var)

getCardinality

protected double getCardinality(double varCardinality,
                                Var var)

getCardinality

protected double getCardinality(double varCardinality,
                                Collection<Var> vars)

countConstantVars

protected int countConstantVars(Iterable<Var> vars)

meet

public void meet(Join node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meet

public void meet(LeftJoin node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractQueryModelVisitor<RuntimeException>

meetBinaryTupleOperator

protected void meetBinaryTupleOperator(BinaryTupleOperator node)

Description copied from class: AbstractQueryModelVisitor

Method called by all meet methods with a BinaryTupleOperator node as argument. Forwards the call to AbstractQueryModelVisitor.meetNode(org.eclipse.rdf4j.query.algebra.QueryModelNode) by default.

Overrides:

meetBinaryTupleOperator in class AbstractQueryModelVisitor<RuntimeException>

Parameters:

node - The node that is being visited.

meetUnaryTupleOperator

protected void meetUnaryTupleOperator(UnaryTupleOperator node)

Description copied from class: AbstractQueryModelVisitor

Method called by all meet methods with a UnaryTupleOperator node as argument. Forwards the call to AbstractQueryModelVisitor.meetNode(org.eclipse.rdf4j.query.algebra.QueryModelNode) by default.

Overrides:

meetUnaryTupleOperator in class AbstractQueryModelVisitor<RuntimeException>

Parameters:

node - The node that is being visited.

meetNode

protected void meetNode(QueryModelNode node)

Description copied from class: AbstractQueryModelVisitor

Method called by all of the other meet methods that are not overridden in subclasses. This method can be overridden in subclasses to define default behaviour when visiting nodes. The default behaviour of this method is to visit the node's children.

Overrides:

meetNode in class AbstractQueryModelVisitor<RuntimeException>

Parameters:

node - The node that is being visited.

meetExternalSet

protected void meetExternalSet(ExternalSet node)