Module org.apache.jena.arq

Package org.apache.jena.sparql.algebra

Class OpAsQuery

java.lang.Object

org.apache.jena.sparql.algebra.OpAsQuery

public class OpAsQuery
extends Object

Convert an Op expression in SPARQL syntax, that is, the reverse of algebra generation.

The contract is to return an "equivalent query" - generates the same answers - to the original query that generated the algebra. That may be the same query (the code aims for this, assuming the original query didn't have additional, unnecessary {}), different queries with the same alegra forms, or different equivalent queries - same answers, different algebra - usually where extra {} are added in and not easiely cleaned out.

Some attempt is made to handle algebra expressions with operators from the optimizer.

It is possible to build algrebra expressions directly for which there is no SPARQL query that generates that algebra. This code may produce an equivalent query but that is not guaranteed.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	OpAsQuery.Converter

Constructor Summary

Constructors

Constructor	Description
OpAsQuery()

Method Summary

Modifier and Type	Method	Description
static Query	asQuery(Op op)

Methods inherited from class java.lang.Object

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

Constructor Details

OpAsQuery

public OpAsQuery()

Method Details

asQuery

public static Query asQuery(Op op)