com.bigdata.rdf.sparql.ast.optimizers

Class ASTNamedSubqueryOptimizer

java.lang.Object

com.bigdata.rdf.sparql.ast.optimizers.ASTNamedSubqueryOptimizer

All Implemented Interfaces:

IASTOptimizer

public class ASTNamedSubqueryOptimizer
extends Object
implements IASTOptimizer

Class identifies the join variables for each instance in which a named subquery solution set is incorporated into the query plan.

Version:

$Id$

Author:

Bryan Thompson

See Also:

NamedSubqueryRoot, NamedSubqueryInclude

Constructor Summary

Constructors

Constructor and Description
ASTNamedSubqueryOptimizer()

Method Summary

Methods

Modifier and Type	Method and Description
QueryNodeWithBindingSet	optimize(AST2BOpContext context, QueryNodeWithBindingSet input) Optimize the AST.

Methods inherited from class java.lang.Object

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

Constructor Detail

ASTNamedSubqueryOptimizer

public ASTNamedSubqueryOptimizer()

Method Detail

optimize

public QueryNodeWithBindingSet optimize(AST2BOpContext context,
                               QueryNodeWithBindingSet input)

Description copied from interface: IASTOptimizer

Optimize the AST.

Specified by:

optimize in interface IASTOptimizer

Parameters:

context - The evaluation context.

input - The input to the optimizer, consisting of a queryNode and input binding set.

Returns:

An instance of type QueryNodeWithBindingSet.

Throws:

RuntimeException - if there is an NamedSubqueryInclude for a named solution set which is not generated by the query.

RuntimeException - if there is an NamedSubqueryRoot for a named solution set which is not consumed by the query.

RuntimeException - if there is more than one NamedSubqueryRoot for a given named solution set.