Package org.eclipse.rdf4j.federated.optimizer

Class UnionOptimizer

java.lang.Object

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

org.eclipse.rdf4j.federated.optimizer.UnionOptimizer

All Implemented Interfaces:

FedXOptimizer, QueryModelVisitor<OptimizationException>

public class UnionOptimizer
extends AbstractSimpleQueryModelVisitor<OptimizationException>
implements FedXOptimizer

Optimizer to flatten the UNION operations.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
protected final QueryInfo	queryInfo

Constructor Summary

Constructors

Constructor	Description
UnionOptimizer(QueryInfo queryInfo)

Method Summary

Modifier and Type	Method	Description
protected void	handleUnionArgs(Union union, List<TupleExpr> args)	Add the union arguments to the args list, includes a recursion step for nested unions.
void	meet(Union union)
void	optimize(TupleExpr tupleExpr)	Optimize the provided tuple expression

Methods inherited from class org.eclipse.rdf4j.query.algebra.helpers.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, meet, meet, meet, meet, meet, meet, meetBinaryTupleOperator, meetBinaryValueOperator, meetCompareSubQueryValueOperator, meetNAryValueOperator, meetOther, meetSubQueryValueOperator, meetUnaryTupleOperator, meetUnaryValueOperator, meetUnsupported, meetUpdateExpr

Methods inherited from class java.lang.Object

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

Field Details

queryInfo

protected final QueryInfo queryInfo

Constructor Details

UnionOptimizer

public UnionOptimizer(QueryInfo queryInfo)

Method Details

optimize

public void optimize(TupleExpr tupleExpr)

Description copied from interface: FedXOptimizer

Optimize the provided tuple expression

Specified by:

optimize in interface FedXOptimizer

Parameters:

tupleExpr -

meet

public void meet(Union union)

Specified by:

meet in interface QueryModelVisitor<OptimizationException>

Overrides:

meet in class AbstractSimpleQueryModelVisitor<OptimizationException>

handleUnionArgs

protected void handleUnionArgs(Union union,
 List<TupleExpr> args)

Add the union arguments to the args list, includes a recursion step for nested unions.

Parameters:

union -

args -