org.eclipse.rdf4j.federated.optimizer

Class UnionOptimizer

java.lang.Object

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

org.eclipse.rdf4j.federated.optimizer.UnionOptimizer

All Implemented Interfaces:

FedXOptimizer, QueryModelVisitor<OptimizationException>

public class UnionOptimizer
extends AbstractQueryModelVisitor<OptimizationException>
implements FedXOptimizer

Optimizer to flatten the UNION operations.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field and Description
protected QueryInfo	queryInfo

Constructor Summary

Constructors

Constructor and Description
UnionOptimizer(QueryInfo queryInfo)

Method Summary

Modifier and Type	Method and 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.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, meet, meet, meet, meet, meet, meet, meet, meet, meetBinaryTupleOperator, meetBinaryValueOperator, meetCompareSubQueryValueOperator, meetNAryValueOperator, meetNode, meetOther, meetSubQueryValueOperator, meetUnaryTupleOperator, meetUnaryValueOperator, meetUpdateExpr

Methods inherited from class java.lang.Object

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

Field Detail

queryInfo

protected final QueryInfo queryInfo

Constructor Detail

UnionOptimizer

public UnionOptimizer(QueryInfo queryInfo)

Method Detail

optimize

public void optimize(TupleExpr tupleExpr)

Description copied from interface: FedXOptimizer

Optimize the provided tuple expression

Specified by:

optimize in interface FedXOptimizer

meet

public void meet(Union union)

Specified by:

meet in interface QueryModelVisitor<OptimizationException>

Overrides:

meet in class AbstractQueryModelVisitor<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 -