org.openrdf.sail.federation.optimizers
Class EmptyPatternOptimizer

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

All Implemented Interfaces:

QueryOptimizer, QueryModelVisitor<RepositoryException>

public class EmptyPatternOptimizer
extends QueryModelVisitorBase<RepositoryException>
implements QueryOptimizer

Remove StatementPatterns that have no statements.

Author:

James Leigh

Constructor Summary

EmptyPatternOptimizer(Collection<? extends RepositoryConnection> members)

Method Summary

void	meet(StatementPattern 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, meet, meetBinaryTupleOperator, meetBinaryValueOperator, meetCompareSubQueryValueOperator, meetNode, meetOther, meetSubQueryValueOperator, meetUnaryTupleOperator, meetUnaryValueOperator

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyPatternOptimizer

public EmptyPatternOptimizer(Collection<? extends RepositoryConnection> members)

Method Detail

optimize

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

Specified by:

optimize in interface QueryOptimizer

meet

public void meet(StatementPattern node)
          throws RepositoryException

Specified by:

meet in interface QueryModelVisitor<RepositoryException>

Overrides:

meet in class QueryModelVisitorBase<RepositoryException>

Throws:

RepositoryException