| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.rya.streams.kafka; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.openrdf.query.algebra.Filter; |
| import org.openrdf.query.algebra.MultiProjection; |
| import org.openrdf.query.algebra.Projection; |
| import org.openrdf.query.algebra.StatementPattern; |
| import org.openrdf.query.algebra.helpers.QueryModelVisitorBase; |
| import org.openrdf.query.parser.ParsedQuery; |
| import org.openrdf.query.parser.sparql.SPARQLParser; |
| |
| import edu.umd.cs.findbugs.annotations.DefaultAnnotation; |
| import edu.umd.cs.findbugs.annotations.NonNull; |
| import edu.umd.cs.findbugs.annotations.Nullable; |
| |
| /** |
| * A set of utility functions that are useful when writing tests RDF functions. |
| */ |
| @DefaultAnnotation(NonNull.class) |
| public final class RdfTestUtil { |
| |
| private RdfTestUtil() { } |
| |
| /** |
| * Fetch the {@link StatementPattern} from a SPARQL string. |
| * |
| * @param sparql - A SPARQL query that contains only a single Statement Patern. (not nul) |
| * @return The {@link StatementPattern} that was in the query, if it could be found. Otherwise {@code null} |
| * @throws Exception The statement pattern could not be found in the parsed SPARQL query. |
| */ |
| public static @Nullable StatementPattern getSp(final String sparql) throws Exception { |
| requireNonNull(sparql); |
| |
| final AtomicReference<StatementPattern> statementPattern = new AtomicReference<>(); |
| final ParsedQuery parsed = new SPARQLParser().parseQuery(sparql, null); |
| parsed.getTupleExpr().visitChildren(new QueryModelVisitorBase<Exception>() { |
| @Override |
| public void meet(final StatementPattern node) throws Exception { |
| statementPattern.set(node); |
| } |
| }); |
| return statementPattern.get(); |
| } |
| |
| /** |
| * Get the first {@link Projection} node from a SPARQL query. |
| * |
| * @param sparql - The query that contains a single Projection node. |
| * @return The first {@link Projection} that is encountered. |
| * @throws Exception The query could not be parsed. |
| */ |
| public static @Nullable Projection getProjection(final String sparql) throws Exception { |
| requireNonNull(sparql); |
| |
| final AtomicReference<Projection> projection = new AtomicReference<>(); |
| final ParsedQuery parsed = new SPARQLParser().parseQuery(sparql, null); |
| parsed.getTupleExpr().visit(new QueryModelVisitorBase<Exception>() { |
| @Override |
| public void meet(final Projection node) throws Exception { |
| projection.set(node); |
| } |
| }); |
| |
| return projection.get(); |
| } |
| |
| /** |
| * Get the first {@link MultiProjection} node from a SPARQL query. |
| * |
| * @param sparql - The query that contains a single Projection node. |
| * @return The first {@link MultiProjection} that is encountered. |
| * @throws Exception The query could not be parsed. |
| */ |
| public static @Nullable MultiProjection getMultiProjection(final String sparql) throws Exception { |
| requireNonNull(sparql); |
| |
| final AtomicReference<MultiProjection> multiProjection = new AtomicReference<>(); |
| final ParsedQuery parsed = new SPARQLParser().parseQuery(sparql, null); |
| parsed.getTupleExpr().visit(new QueryModelVisitorBase<Exception>() { |
| @Override |
| public void meet(final MultiProjection node) throws Exception { |
| multiProjection.set(node); |
| } |
| }); |
| |
| return multiProjection.get(); |
| } |
| |
| /** |
| * Get the first {@link Filter} node from a SPARQL query. |
| * |
| * @param sparql - The query that contains a single Projection node. |
| * @return The first {@link Filter} that is encountered. |
| * @throws Exception The query could not be parsed. |
| */ |
| public static @Nullable Filter getFilter(final String sparql) throws Exception { |
| requireNonNull(sparql); |
| |
| final AtomicReference<Filter> filter = new AtomicReference<>(); |
| final ParsedQuery parsed = new SPARQLParser().parseQuery(sparql, null); |
| parsed.getTupleExpr().visit(new QueryModelVisitorBase<Exception>() { |
| @Override |
| public void meet(final Filter node) throws Exception { |
| filter.set(node); |
| } |
| }); |
| |
| return filter.get(); |
| } |
| } |