/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Sep 4, 2011
*/
package com.bigdata.rdf.sparql.ast.eval.service;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import org.openrdf.model.BNode;
import org.openrdf.model.Value;
import org.openrdf.model.impl.BNodeImpl;
import org.openrdf.model.impl.LiteralImpl;
import org.openrdf.model.vocabulary.DC;
import org.openrdf.query.BindingSet;
import org.openrdf.query.algebra.StatementPattern.Scope;
import org.openrdf.query.impl.MapBindingSet;
import com.bigdata.bop.Constant;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IConstant;
import com.bigdata.bop.IVariable;
import com.bigdata.bop.Var;
import com.bigdata.bop.bindingSet.ListBindingSet;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.internal.XSD;
import com.bigdata.rdf.model.BigdataLiteral;
import com.bigdata.rdf.model.BigdataURI;
import com.bigdata.rdf.model.BigdataValue;
import com.bigdata.rdf.sail.sparql.PrefixDeclProcessor;
import com.bigdata.rdf.sparql.AbstractBigdataExprBuilderTestCase;
import com.bigdata.rdf.sparql.ast.BindingsClause;
import com.bigdata.rdf.sparql.ast.ConstantNode;
import com.bigdata.rdf.sparql.ast.FilterNode;
import com.bigdata.rdf.sparql.ast.FunctionNode;
import com.bigdata.rdf.sparql.ast.GraphPatternGroup;
import com.bigdata.rdf.sparql.ast.IGroupMemberNode;
import com.bigdata.rdf.sparql.ast.JoinGroupNode;
import com.bigdata.rdf.sparql.ast.ProjectionNode;
import com.bigdata.rdf.sparql.ast.QueryRoot;
import com.bigdata.rdf.sparql.ast.QueryType;
import com.bigdata.rdf.sparql.ast.StatementPatternNode;
import com.bigdata.rdf.sparql.ast.VarNode;
import com.bigdata.rdf.sparql.ast.service.IRemoteSparqlQueryBuilder;
import com.bigdata.rdf.sparql.ast.service.RemoteSparql11QueryBuilder;
import com.bigdata.rdf.sparql.ast.service.ServiceNode;
/**
* Test suite for the {@link RemoteSparql11QueryBuilder}, including some correct
* rejection tests when the solutions to be vectored to the remote end point can
* not be represented using the <code>BINDINGS</code> clause.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id: TestRemoteServiceCallImpl.java 6060 2012-03-02 16:07:38Z
* thompsonbry $
*/
public class TestRemoteSparql11QueryBuilder extends
AbstractBigdataExprBuilderTestCase {
private static final Logger log = Logger
.getLogger(TestRemoteSparql11QueryBuilder.class);
/**
*
*/
public TestRemoteSparql11QueryBuilder() {
}
/**
* @param name
*/
public TestRemoteSparql11QueryBuilder(String name) {
super(name);
}
/**
* Return the {@link IRemoteSparqlQueryBuilder} under test.
* @param serviceNode
* @param a
* @return
*/
protected IRemoteSparqlQueryBuilder newFixture(
final ServiceNode serviceNode, final BindingSet[] a) {
// final RemoteServiceOptions options = new RemoteServiceOptions();
//
// options.setSparql11(true);
return new RemoteSparql11QueryBuilder(serviceNode);
}
@SuppressWarnings("unchecked")
private void addResolveIVs(final BigdataValue... values) {
tripleStore.getLexiconRelation()
.addTerms(values, values.length, false/* readOnly */);
/*
* Cache value on IVs to align with behavior of the SPARQL parser.
*
* Note: BatchRDFValueResolver does this, so we have to do it to in
* order to have an exact structural match when we parse the generated
* SPARQL query and then verify the AST model.
*/
for (BigdataValue v : values) {
v.getIV().setValue(v);
}
}
/**
* Wrap as an {@link IConstant}.
*
* @param iv
* The {@link IV}.
*
* @return The {@link IConstant}.
*/
private IConstant<?> asConstant(final IV<?,?> iv) {
return new Constant<IV<?,?>>(iv);
}
/**
* A simple test with nothing bound and NO source solution. For this case
* the BINDINGS clause should be omitted.
*/
public void test_service_001() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
{
prefixDecls.put("foo", "http://www.bigdata.com/foo");
}
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
if (queryStr.toUpperCase().indexOf("BINDINGS") != -1) {
/*
* The bindings clause should be suppressed for this case so we can
* use the same query builder logic against end points which do and
* do not support BINDINGS.
*/
fail("BINDINGS clause should be suppressed.");
}
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("s"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A simple test with nothing bound and a single <em>empty</em> source
* solution. For this case the BINDINGS clause should be omitted.
*/
public void test_service_001b() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
{
prefixDecls.put("foo", "http://www.bigdata.com/foo");
}
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
{
bindingSets.add(new MapBindingSet());
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
if (queryStr.toUpperCase().indexOf("BINDINGS") != -1) {
/*
* The bindings clause should be suppressed for this case so we can
* use the same query builder logic against end points which do and
* do not support BINDINGS.
*/
fail("BINDINGS clause should be suppressed.");
}
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("s"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A test where a single fully bound triple pattern is presented.
* <p>
* Note: It is possible to optimize this as an ASK query, but only when
* there is a single solution flowing into the service end point.
*/
public void test_service_002() throws Exception {
/*
* Resolve IVs that we will use below.
*/
final BigdataURI dcCreator = valueFactory.asValue(DC.CREATOR);
final BigdataURI book1 = valueFactory.createURI("http://example.org/book/book1");
final BigdataURI book2 = valueFactory.createURI("http://example.org/book/book2");
final BigdataURI author1 = valueFactory.createURI("http://example.org/author/author1");
final BigdataURI author2 = valueFactory.createURI("http://example.org/author/author2");
addResolveIVs(dcCreator, book1, book2, author1, author2);
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
{
prefixDecls.put("foo", "http://www.bigdata.com/foo");
}
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("s", book1);
bset.addBinding("p", DC.CREATOR);
bset.addBinding("o", author1);
bindingSets.add(bset);
}
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("s", book2);
bset.addBinding("p", DC.CREATOR);
bset.addBinding("o", author2);
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("s"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
{
final LinkedHashSet<IVariable<?>> vars = new LinkedHashSet<IVariable<?>>();
final List<IBindingSet> solutionsIn = new LinkedList<IBindingSet>();
final BindingsClause bindingsClause = new BindingsClause(vars,
solutionsIn);
expected.setBindingsClause(bindingsClause);
{
vars.add(Var.var("s"));
vars.add(Var.var("p"));
vars.add(Var.var("o"));
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("s"), asConstant(book1.getIV()));
bset.set(Var.var("p"), asConstant(dcCreator.getIV()));
bset.set(Var.var("o"), asConstant(author1.getIV()));
solutionsIn.add(bset);
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("s"), asConstant(book2.getIV()));
bset.set(Var.var("p"), asConstant(dcCreator.getIV()));
bset.set(Var.var("o"), asConstant(author2.getIV()));
solutionsIn.add(bset);
}
}
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A variant test in which there are some BINDINGS to be passed through. The
* set of bindings covers the different types of RDF {@link Value} and also
* exercises the prefix declarations. This test does NOT use blank nodes in
* the BINDINGS.
*/
public void test_service_003() throws Exception {
/*
* Resolve IVs that we will use below.
*/
final BigdataURI dcCreator = valueFactory.asValue(DC.CREATOR);
final BigdataURI book1 = valueFactory.createURI("http://example.org/book/book1");
final BigdataURI book2 = valueFactory.createURI("http://example.org/book/book2");
final BigdataLiteral book3 = valueFactory.createLiteral("Semantic Web Primer");
final BigdataLiteral book4 = valueFactory.createLiteral("Semantic Web Primer", "DE");
final BigdataLiteral book5 = valueFactory.createLiteral("12", XSD.INT);
final BigdataLiteral book6 = valueFactory.createLiteral("true", XSD.BOOLEAN);
addResolveIVs(dcCreator, book1, book2, book3, book4, book5, book6);
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("book")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?book ?p ?o}";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
{
prefixDecls.put("", "http://example.org/book/");
}
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("book"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("book", book1);
bindingSets.add(bset);
}
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("book", book2);
bindingSets.add(bset);
}
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("book", book3);
bindingSets.add(bset);
}
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("book", book4);
bindingSets.add(bset);
}
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("book", book5);
bindingSets.add(bset);
}
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("book", book6);
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("book"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
whereClause.addChild(new StatementPatternNode(new VarNode("book"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
{
final LinkedHashSet<IVariable<?>> vars = new LinkedHashSet<IVariable<?>>();
final List<IBindingSet> solutionsIn = new LinkedList<IBindingSet>();
final BindingsClause bindingsClause = new BindingsClause(vars,
solutionsIn);
expected.setBindingsClause(bindingsClause);
{
vars.add(Var.var("book"));
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("book"), asConstant(book1.getIV()));
solutionsIn.add(bset);
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("book"), asConstant(book2.getIV()));
solutionsIn.add(bset);
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("book"), asConstant(book3.getIV()));
solutionsIn.add(bset);
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("book"), asConstant(book4.getIV()));
solutionsIn.add(bset);
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("book"), asConstant(book5.getIV()));
solutionsIn.add(bset);
}
{
final ListBindingSet bset = new ListBindingSet();
bset.set(Var.var("book"), asConstant(book6.getIV()));
solutionsIn.add(bset);
}
}
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A variant test in there is a blank node in the BINDINGS to be flowed
* through to the remote SERVICE. In this test the blank nodes are not
* correlated so we do not need to impose a FILTER on the remote service.
*/
public void test_service_004() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
/*
* Note: Blank nodes are not permitting in the BINDINGS clause (per the
* SPARQL 1.1 grammar). However, a blank node MAY be turned into an
* unbound variable as long as we impose the constraint that all vars
* having that blank node for a solution are EQ (same term).
*/
{
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("s", new BNodeImpl("abc"));
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("s"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
{
final LinkedHashSet<IVariable<?>> vars = new LinkedHashSet<IVariable<?>>();
final List<IBindingSet> solutionsIn = new LinkedList<IBindingSet>();
final BindingsClause bindingsClause = new BindingsClause(vars,
solutionsIn);
expected.setBindingsClause(bindingsClause);
{
vars.add(Var.var("s"));
}
/*
* Note: The blank node should be sent across as a variable
* without a bound value (UNDEF).
*/
{
final ListBindingSet bset = new ListBindingSet();
solutionsIn.add(bset);
}
}
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A variant test in there is a blank node in the BINDINGS to be flowed
* through to the remote SERVICE. In this test the blank nodes are
* correlated but there is only one solution to be vectored so we will
* impose a FILTER on the remote service to enforce that correlation.
*/
public void test_service_005() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
/*
* Note: Blank nodes are not permitting in the BINDINGS clause (per the
* SPARQL 1.1 grammar). However, a blank node MAY be turned into an
* unbound variable as long as we impose the constraint that all vars
* having that blank node for a solution are EQ (same term).
*
* Note: For this query, the *same* blank node is used for ?s and ?book.
* That needs to be turned into a FILTER which is attached to the remote
* SPARQL query in order to maintain the correlation between those
* variables (FILTER ?s = ?book).
*/
{
final MapBindingSet bset = new MapBindingSet();
final BNode tmp = new BNodeImpl("abc");
bset.addBinding("s", tmp);
bset.addBinding("o", tmp);
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("s"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
// A FILTER to enforce variable correlation.
whereClause.addChild(new FilterNode(FunctionNode.sameTerm(
new VarNode("s"), new VarNode("o"))));
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
{
final LinkedHashSet<IVariable<?>> vars = new LinkedHashSet<IVariable<?>>();
final List<IBindingSet> solutionsIn = new LinkedList<IBindingSet>();
final BindingsClause bindingsClause = new BindingsClause(vars,
solutionsIn);
expected.setBindingsClause(bindingsClause);
{
vars.add(Var.var("s"));
vars.add(Var.var("o"));
}
/*
* Note: The blank node should be sent across as a variable
* without a bound value (UNDEF).
*/
{
final ListBindingSet bset = new ListBindingSet();
solutionsIn.add(bset);
}
}
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A variant test in there is a blank node in the BINDINGS to be flowed
* through to the remote SERVICE. In this test the blank nodes are
* correlated but there is only one solution to be vectored so we will
* impose a FILTER on the remote service to enforce that correlation. This
* test differs from the previous test by making more than two variables in
* the SERVICE clause correlated through shared blank nodes. We need to use
* a more complex SERVICE graph pattern to accomplish this since the
* predicate can not be a blank node.
*/
public void test_service_006() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o1")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o . ?s ?p ?o1 }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
projectedVars.add(Var.var("o1"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
/*
* Note: Blank nodes are not permitting in the BINDINGS clause (per the
* SPARQL 1.1 grammar). However, a blank node MAY be turned into an
* unbound variable as long as we impose the constraint that all vars
* having that blank node for a solution are EQ (same term).
*
* Note: For this query, the *same* blank node is used for ?s and ?book.
* That needs to be turned into a FILTER which is attached to the remote
* SPARQL query in order to maintain the correlation between those
* variables (FILTER ?s = ?book).
*/
{
final MapBindingSet bset = new MapBindingSet();
final BNode tmp = new BNodeImpl("abc");
bset.addBinding("s", tmp);
bset.addBinding("o", tmp);
bset.addBinding("o1", tmp);
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode,a);
final String queryStr = fixture.getSparqlQuery(a);
// Verify the structure of the rewritten query.
final QueryRoot expected = new QueryRoot(QueryType.SELECT);
{
expected.setPrefixDecls(prefixDecls);
final ProjectionNode projection = new ProjectionNode();
projection.addProjectionVar(new VarNode("s"));
projection.addProjectionVar(new VarNode("p"));
projection.addProjectionVar(new VarNode("o"));
projection.addProjectionVar(new VarNode("o1"));
expected.setProjection(projection);
final JoinGroupNode whereClause = new JoinGroupNode();
// A FILTER to enforce variable correlation.
whereClause.addChild(new FilterNode(FunctionNode.AND(//
FunctionNode.sameTerm(new VarNode("s"), new VarNode("o")),//
FunctionNode.sameTerm(new VarNode("s"), new VarNode("o1"))//
)));
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o"), null/* c */,
Scope.DEFAULT_CONTEXTS));
whereClause.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o1"), null/* c */,
Scope.DEFAULT_CONTEXTS));
expected.setWhereClause(whereClause);
{
final LinkedHashSet<IVariable<?>> vars = new LinkedHashSet<IVariable<?>>();
final List<IBindingSet> solutionsIn = new LinkedList<IBindingSet>();
final BindingsClause bindingsClause = new BindingsClause(vars,
solutionsIn);
expected.setBindingsClause(bindingsClause);
{
vars.add(Var.var("s"));
vars.add(Var.var("o"));
vars.add(Var.var("o1"));
}
/*
* Note: The blank node should be sent across as a variable
* without a bound value (UNDEF).
*/
{
final ListBindingSet bset = new ListBindingSet();
solutionsIn.add(bset);
}
}
}
final QueryRoot actual = parse(queryStr, baseURI);
assertSameAST(queryStr, expected, actual);
}
/**
* A variant test in there is a blank node in the BINDINGS to be flowed
* through to the remote SERVICE. In this test the blank nodes are
* correlated and there is more than one solution to be vectored so we MUST
* impose a FILTER on the remote service to enforce that correlation.
* <p>
* Note: This case can not be handled with the
* {@link RemoteSparql11QueryBuilder}.
*/
public void test_service_007() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
/*
* Note: Blank nodes are not permitting in the BINDINGS clause (per the
* SPARQL 1.1 grammar). However, a blank node MAY be turned into an
* unbound variable as long as we impose the constraint that all vars
* having that blank node for a solution are EQ (same term).
*
* Note: For this query, the *same* blank node is used for ?s and ?book.
* That needs to be turned into a FILTER which is attached to the remote
* SPARQL query in order to maintain the correlation between those
* variables (FILTER ?s = ?book).
*/
{
final MapBindingSet bset = new MapBindingSet();
final BNode tmp = new BNodeImpl("abc");
bset.addBinding("s", tmp);
bset.addBinding("o", tmp);
bindingSets.add(bset);
}
{ // A 2nd solution is required to force the correlated var/bnode issue.
final MapBindingSet bset = new MapBindingSet();
bset.addBinding("s", new LiteralImpl("Semantic Web Primer"));
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
try {
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode, a);
fixture.getSparqlQuery(a);
fail("Expecting: "+UnsupportedOperationException.class);
} catch (UnsupportedOperationException ex) {
if (log.isInfoEnabled())
log.info("Ignoring expected exception: " + ex);
}
}
/**
* A variant test in there is a blank node in the BINDINGS to be flowed
* through to the remote SERVICE. In this test the blank nodes are
* correlated so we MUST impose a constraint on the remote service to
* enforce that correlation. However, there is another solution in which the
* two variables are NOT correlated so that FILTER MUST NOT be imposed
* across all such solutions. Therefore the SERVICE class will be vectored
* by rewriting it into a UNION with different variable names in each
* variant of the UNION.
* <p>
* Note: This case can not be handled with the
* {@link RemoteSparql11QueryBuilder}.
*/
public void test_service_008() throws Exception {
final BigdataURI serviceURI = valueFactory
.createURI("http://www.bigdata.com/myService");
final GraphPatternGroup<IGroupMemberNode> groupNode = new JoinGroupNode();
{
groupNode.addChild(new StatementPatternNode(new VarNode("s"),
new VarNode("p"), new VarNode("o")));
}
final String exprImage = "SERVICE <" + serviceURI + "> { ?s ?p ?o }";
final Map<String,String> prefixDecls = new LinkedHashMap<String, String>(PrefixDeclProcessor.defaultDecls);
final ServiceNode serviceNode = new ServiceNode(new ConstantNode(
makeIV(serviceURI)), groupNode);
{
final Set<IVariable<?>> projectedVars = new LinkedHashSet<IVariable<?>>();
{
projectedVars.add(Var.var("s"));
projectedVars.add(Var.var("p"));
projectedVars.add(Var.var("o"));
}
serviceNode.setExprImage(exprImage);
serviceNode.setPrefixDecls(prefixDecls);
serviceNode.setProjectedVars(projectedVars);
}
final List<BindingSet> bindingSets = new LinkedList<BindingSet>();
/*
* Note: Blank nodes are not permitting in the BINDINGS clause (per the
* SPARQL 1.1 grammar). However, a blank node MAY be turned into an
* unbound variable as long as we impose the constraint that all vars
* having that blank node for a solution are EQ (same term).
*
* Note: For this query, the *same* blank node is used for ?s and ?book.
* That needs to be turned into a FILTER which is attached to the remote
* SPARQL query in order to maintain the correlation between those
* variables (FILTER ?s = ?book).
*/
{ // Note: Blank nodes ARE correlated for this solution.
final MapBindingSet bset = new MapBindingSet();
final BNode tmp = new BNodeImpl("abc");
bset.addBinding("s", tmp);
bset.addBinding("o", tmp);
bindingSets.add(bset);
}
{ // Note: Blank nodes are NOT correlated for this solution.
final MapBindingSet bset = new MapBindingSet();
final BNode tmp1 = new BNodeImpl("foo");
final BNode tmp2 = new BNodeImpl("bar");
bset.addBinding("s", tmp1);
bset.addBinding("o", tmp2);
bindingSets.add(bset);
}
final BindingSet[] a = bindingSets.toArray(new BindingSet[bindingSets
.size()]);
try {
final IRemoteSparqlQueryBuilder fixture = newFixture(serviceNode, a);
fixture.getSparqlQuery(a);
fail("Expecting: "+UnsupportedOperationException.class);
} catch (UnsupportedOperationException ex) {
if (log.isInfoEnabled())
log.info("Ignoring expected exception: " + ex);
}
}
}