org.openrdf.sail.federation.optimizers
Class FederationJoinOptimizer

java.lang.Object
  org.openrdf.query.algebra.helpers.QueryModelVisitorBase<RepositoryException>
      org.openrdf.sail.federation.optimizers.FederationJoinOptimizer

All Implemented Interfaces:

QueryOptimizer, QueryModelVisitor<RepositoryException>

public class FederationJoinOptimizer
extends QueryModelVisitorBase<RepositoryException>
implements QueryOptimizer

Search for Join, LeftJoin, and Union arguments that can be evaluated in a single member.

Author:

James Leigh

Constructor Summary

FederationJoinOptimizer(Collection<? extends RepositoryConnection> members, boolean distinct, PrefixHashSet localSpace)

Method Summary

void	meet(LeftJoin node)
void	meet(Union node)
void	meetMultiJoin(NaryJoin node)
void	meetOther(QueryModelNode node)
protected void	meetUnaryTupleOperator(UnaryTupleOperator node)
void	optimize(TupleExpr query, Dataset dataset, BindingSet bindings)

Methods inherited from class org.openrdf.query.algebra.helpers.QueryModelVisitorBase

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, meetNode, meetSubQueryValueOperator, meetUnaryValueOperator

Methods inherited from class java.lang.Object

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

Constructor Detail

FederationJoinOptimizer

public FederationJoinOptimizer(Collection<? extends RepositoryConnection> members,
                               boolean distinct,
                               PrefixHashSet localSpace)

Method Detail

optimize

public void optimize(TupleExpr query,
                     Dataset dataset,
                     BindingSet bindings)

Specified by:

optimize in interface QueryOptimizer

meetOther

public void meetOther(QueryModelNode node)
               throws RepositoryException

Specified by:

meetOther in interface QueryModelVisitor<RepositoryException>

Overrides:

meetOther in class QueryModelVisitorBase<RepositoryException>

Throws:

RepositoryException

meetMultiJoin

public void meetMultiJoin(NaryJoin node)
                   throws RepositoryException

Throws:

RepositoryException

meet

public void meet(LeftJoin node)
          throws RepositoryException

Specified by:

meet in interface QueryModelVisitor<RepositoryException>

Overrides:

meet in class QueryModelVisitorBase<RepositoryException>

Throws:

RepositoryException

meet

public void meet(Union node)
          throws RepositoryException

Specified by:

meet in interface QueryModelVisitor<RepositoryException>

Overrides:

meet in class QueryModelVisitorBase<RepositoryException>

Throws:

RepositoryException

meetUnaryTupleOperator

protected void meetUnaryTupleOperator(UnaryTupleOperator node)
                               throws RepositoryException

Overrides:

meetUnaryTupleOperator in class QueryModelVisitorBase<RepositoryException>

Throws:

RepositoryException