Class ConstantOptimizer.ConstantVisitor

java.lang.Object

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

org.eclipse.rdf4j.query.algebra.evaluation.optimizer.ConstantOptimizer.VarNameCollector

org.eclipse.rdf4j.query.algebra.evaluation.optimizer.ConstantOptimizer.ConstantVisitor

All Implemented Interfaces:

QueryModelVisitor<RuntimeException>

Enclosing class:

ConstantOptimizer

private static class ConstantOptimizer.ConstantVisitor
extends ConstantOptimizer.VarNameCollector

Field Summary

Fields

Modifier and Type	Field	Description
private final QueryEvaluationContext	context
(package private) List<ProjectionElemList>	projElemLists
private final EvaluationStrategy	strategy

Fields inherited from class ConstantOptimizer.VarNameCollector

varNames

Constructor Summary

Constructors

Constructor	Description
ConstantVisitor(EvaluationStrategy strategy, QueryEvaluationContext context)

Method Summary

Modifier and Type	Method	Description
private boolean	isConstant(ValueExpr expr)
private boolean	isConstantZeroArgFunction(FunctionCall functionCall)	Determines if the provided zero-arg function is a function that should return a constant value for the entire query execution (e.g NOW()), or if it should generate a new value for every call (e.g.
void	meet(And and)
void	meet(Bound bound)
void	meet(FunctionCall functionCall)
void	meet(If node)
void	meet(Or or)
void	meet(ProjectionElemList projElems)
void	meet(Regex node)	Override meetBinaryValueOperator
protected void	meetBinaryValueOperator(BinaryValueOperator binaryValueOp)	Method called by all meet methods with a BinaryValueOperator node as argument.
protected void	meetUnaryValueOperator(UnaryValueOperator unaryValueOp)	Method called by all meet methods with a UnaryValueOperator node as argument.

Methods inherited from class ConstantOptimizer.VarNameCollector

meet

Methods inherited from class AbstractSimpleQueryModelVisitor

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, meet, meet, meet, meet, meetBinaryTupleOperator, meetCompareSubQueryValueOperator, meetNAryValueOperator, meetOther, meetSubQueryValueOperator, meetUnaryTupleOperator, meetUnsupported, meetUpdateExpr

Methods inherited from class Object

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

Field Details

strategy

private final EvaluationStrategy strategy

context

private final QueryEvaluationContext context

projElemLists

List<ProjectionElemList> projElemLists

Constructor Details

ConstantVisitor

public ConstantVisitor(EvaluationStrategy strategy,
 QueryEvaluationContext context)

Method Details

meet

public void meet(ProjectionElemList projElems)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

meet

public void meet(Or or)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

meet

public void meet(And and)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

meetBinaryValueOperator

protected void meetBinaryValueOperator(BinaryValueOperator binaryValueOp)

Description copied from class: AbstractSimpleQueryModelVisitor

Method called by all meet methods with a BinaryValueOperator node as argument.

Overrides:

meetBinaryValueOperator in class AbstractSimpleQueryModelVisitor<RuntimeException>

Parameters:

binaryValueOp - The node that is being visited.

meetUnaryValueOperator

protected void meetUnaryValueOperator(UnaryValueOperator unaryValueOp)

Description copied from class: AbstractSimpleQueryModelVisitor

Method called by all meet methods with a UnaryValueOperator node as argument.

Overrides:

meetUnaryValueOperator in class AbstractSimpleQueryModelVisitor<RuntimeException>

Parameters:

unaryValueOp - The node that is being visited.

meet

public void meet(FunctionCall functionCall)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

isConstantZeroArgFunction

private boolean isConstantZeroArgFunction(FunctionCall functionCall)

Determines if the provided zero-arg function is a function that should return a constant value for the entire query execution (e.g NOW()), or if it should generate a new value for every call (e.g. RAND()).

Parameters:

functionCall - a zero-arg function call.

Returns:

true iff the provided function returns a constant value for the query execution, false otherwise.

meet

public void meet(Bound bound)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

meet

public void meet(If node)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

meet

public void meet(Regex node)

Override meetBinaryValueOperator

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<RuntimeException>

isConstant

private boolean isConstant(ValueExpr expr)