Package cz.cvut.kbss.jopa.query.sparql.loader

Class UnboundPredicateObjectSparqlAssemblyModifier

java.lang.Object

cz.cvut.kbss.jopa.query.sparql.loader.UnboundPredicateObjectSparqlAssemblyModifier

All Implemented Interfaces:

SparqlAssemblyModifier

public class UnboundPredicateObjectSparqlAssemblyModifier
extends Object
implements SparqlAssemblyModifier

Optimizes entity loading by modifying the query to fetch all entity attributes.

This optimizer is applicable for SELECT queries that select instances of an entity class. Instead of loading the instances one by one after the query is evaluated, this optimizer modifies the query to fetch all available entity attributes by injecting a triple pattern with unbound predicate and object variables into the query.

Constructor Summary

Constructors

Constructor	Description
UnboundPredicateObjectSparqlAssemblyModifier()

Method Summary

Modifier and Type	Method	Description
void	modify(TokenStreamSparqlQueryHolder queryHolder, org.antlr.v4.runtime.TokenStreamRewriter tokenRewriter, QueryAttributes queryAttributes)	Modifies the query.

Methods inherited from class java.lang.Object

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

Constructor Details

UnboundPredicateObjectSparqlAssemblyModifier

public UnboundPredicateObjectSparqlAssemblyModifier()

Method Details

modify

public void modify(TokenStreamSparqlQueryHolder queryHolder,
 org.antlr.v4.runtime.TokenStreamRewriter tokenRewriter,
 QueryAttributes queryAttributes)

Description copied from interface: SparqlAssemblyModifier

Modifies the query.

Specified by:

modify in interface SparqlAssemblyModifier

Parameters:

queryHolder - Query holder

tokenRewriter - Token stream rewriter used to modify the query

queryAttributes - Query attributes