org.openrdf.query.algebra.evaluation.impl
Class QueryModelNormalizer

java.lang.Object
  org.openrdf.query.algebra.helpers.QueryModelVisitorBase<RuntimeException>
      org.openrdf.query.algebra.evaluation.impl.QueryModelNormalizer

All Implemented Interfaces:

QueryOptimizer, QueryModelVisitor<RuntimeException>

public class QueryModelNormalizer
extends QueryModelVisitorBase<RuntimeException>
implements QueryOptimizer

A query optimizer that (partially) normalizes query models to a canonical form. Note: this implementation does not yet cover all query node types.

Author:

Arjohn Kampman

Constructor Summary

QueryModelNormalizer()

Method Summary

void	meet(And and)
void	meet(Difference difference)
void	meet(Intersection intersection)
void	meet(Join join)
void	meet(LeftJoin leftJoin)
void	meet(Or or)
void	meet(Union union)
void	optimize(TupleExpr tupleExpr, 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, 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

QueryModelNormalizer

public QueryModelNormalizer()

Method Detail

optimize

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

Specified by:

optimize in interface QueryOptimizer

meet

public void meet(Join join)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>

meet

public void meet(LeftJoin leftJoin)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>

meet

public void meet(Union union)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>

meet

public void meet(Difference difference)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>

meet

public void meet(Intersection intersection)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>

meet

public void meet(Or or)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>

meet

public void meet(And and)

Specified by:

meet in interface QueryModelVisitor<RuntimeException>

Overrides:

meet in class QueryModelVisitorBase<RuntimeException>