com.bigdata.rdf.sparql.ast.service

Class RemoteSparql11QueryBuilder

java.lang.Object

com.bigdata.rdf.sparql.ast.service.RemoteSparql11QueryBuilder

All Implemented Interfaces:

IRemoteSparqlQueryBuilder

Direct Known Subclasses:

RemoteSparql11DraftQueryBuilder

public class RemoteSparql11QueryBuilder
extends Object
implements IRemoteSparqlQueryBuilder

Utility class constructs a valid SPARQL query for a remote SPARQL 1.1 using the VALUES clause to vector solutions into that remote end point.

Version:

$Id: RemoteSparqlQueryBuilder.java 6071 2012-03-04 18:08:57Z thompsonbry $

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
protected String	exprImage The text "image" of the SERVICE clause.
protected Map<String,String>	prefixDecls The prefix declarations used within the SERVICE clause (from the original query).
protected Set<IVariable<?>>	projectedVars The distinct variables "projected" by the SERVICE group graph pattern.
protected AST2SPARQLUtil	util

Constructor Summary

Constructors

Constructor and Description
RemoteSparql11QueryBuilder(ServiceNode serviceNode)

Method Summary

Methods

Modifier and Type	Method and Description
protected static Map<org.openrdf.model.BNode,Set<String>>	getCorrelatedVariables(org.openrdf.query.BindingSet[] bindingSets) Return a correlated blank node / variables map.
protected LinkedHashSet<String>	getDistinctVars(org.openrdf.query.BindingSet[] bindingSets) Return an ordered collection of the distinct variable names used in the given caller's solution set.
String	getSparqlQuery(org.openrdf.query.BindingSet[] bindingSets) Return the SPARQL query that will be sent to the remote SPARQL end point.

Methods inherited from class java.lang.Object

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

Field Detail

exprImage

protected final String exprImage

The text "image" of the SERVICE clause.

prefixDecls

protected final Map<String,String> prefixDecls

The prefix declarations used within the SERVICE clause (from the original query).

util

protected final AST2SPARQLUtil util

projectedVars

protected final Set<IVariable<?>> projectedVars

The distinct variables "projected" by the SERVICE group graph pattern. The order of this set is not important, but the variables must be distinct.

Constructor Detail

RemoteSparql11QueryBuilder

public RemoteSparql11QueryBuilder(ServiceNode serviceNode)

Parameters:

serviceNode - The SERVICE clause.

Method Detail

getDistinctVars

protected LinkedHashSet<String> getDistinctVars(org.openrdf.query.BindingSet[] bindingSets)

Return an ordered collection of the distinct variable names used in the given caller's solution set.

Parameters:

bindingSets - The solution set.

Returns:

The distinct, ordered collection of variables used.

getSparqlQuery

public String getSparqlQuery(org.openrdf.query.BindingSet[] bindingSets)

Description copied from interface: IRemoteSparqlQueryBuilder

Return the SPARQL query that will be sent to the remote SPARQL end point.

Specified by:

getSparqlQuery in interface IRemoteSparqlQueryBuilder

Parameters:

bindingSets - The solutions to flow into the remote SPARQL end point.

Returns:

The query.

getCorrelatedVariables

protected static Map<org.openrdf.model.BNode,Set<String>> getCorrelatedVariables(org.openrdf.query.BindingSet[] bindingSets)

Return a correlated blank node / variables map.

Note: This is necessary because the BINDINGS clause does not permit blank nodes.

Returns:

The correlated variable bindings map -or- null iff there are no variables which are correlated through shared blank nodes.

Throws:

UnsupportedOperationException - If there are correlated variables and there is more than one source solution (for this case you need to use the SPARQL 1.0 compatible query generator).

See Also:

RemoteSparql10QueryBuilder