com.bigdata.rdf.sparql.ast.optimizers

Class ASTConstructOptimizer

java.lang.Object

com.bigdata.rdf.sparql.ast.optimizers.ASTConstructOptimizer

All Implemented Interfaces:

IASTOptimizer

public class ASTConstructOptimizer
extends Object
implements IASTOptimizer

Generates the ProjectionNode for a CONSTRUCT or DESCRIBE query. It is populated with each variable which appears in the ConstructNode. The ASTDescribeOptimizer MUST be run first for a DESCRIBE query.

Version:

$Id$

Author:

Bryan Thompson

Constructor Summary

Constructors

Constructor and Description
ASTConstructOptimizer()

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

ASTConstructOptimizer

public ASTConstructOptimizer()

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.