Java tutorial
/* * 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. */ /* * (c) Copyright 2009 Talis Information Ltd. * (c) Copyright 2010 Epimorphics Ltd. * All rights reserved. * [See end of file] */ package org.apache.rya.jena.jenasesame.example; import java.io.File; import java.net.URL; import org.apache.jena.query.Dataset; import org.apache.jena.rdf.model.InfModel; import org.apache.jena.rdf.model.Model; import org.apache.jena.rdf.model.ModelFactory; import org.apache.jena.rdf.model.Property; import org.apache.jena.rdf.model.RDFNode; import org.apache.jena.rdf.model.Resource; import org.apache.jena.rdf.model.Statement; import org.apache.jena.rdf.model.StmtIterator; import org.apache.jena.reasoner.Reasoner; import org.apache.jena.reasoner.rulesys.GenericRuleReasoner; import org.apache.jena.reasoner.rulesys.Rule; import org.apache.log4j.Logger; import org.apache.rya.jena.jenasesame.JenaSesame; import org.openrdf.repository.Repository; import org.openrdf.repository.RepositoryConnection; import org.openrdf.repository.sail.SailRepository; import org.openrdf.rio.RDFFormat; import org.openrdf.sail.memory.MemoryStore; import org.springframework.util.ResourceUtils; /** * Example: Create an in-memory repository, load some RDF, and use reasoner to * make an inference. */ public class JenaReasoningWithRulesExample { private static final Logger log = Logger.getLogger(JenaReasoningWithRulesExample.class); public static void main(final String args[]) throws Exception { Repository repo = null; RepositoryConnection addConnection = null; RepositoryConnection queryConnection = null; try { repo = new SailRepository(new MemoryStore()); repo.initialize(); // Load some data. addConnection = repo.getConnection(); // Reads files relative from target/test-classes which should have been copied from src/test/resources final URL url = ClassLoader.getSystemResource("rdf_format_files/notation3_files/n3_data.n3"); final File file = ResourceUtils.getFile(url); final String fileName = file.getAbsolutePath(); final RDFFormat rdfFormat = RDFFormat.forFileName(fileName); log.info("Added RDF file with " + rdfFormat.getName() + " format: " + fileName); addConnection.add(file, "http://base/", rdfFormat); addConnection.close(); queryConnection = repo.getConnection(); final Dataset dataset = JenaSesame.createDataset(queryConnection); final Model model = dataset.getDefaultModel(); log.info(model.getNsPrefixMap()); final URL rulesUrl = ClassLoader .getSystemResource("rdf_format_files/notation3_files/rule_files/rules.txt"); final File rulesFile = ResourceUtils.getFile(rulesUrl); final String rulesFileName = rulesFile.getAbsolutePath(); final Reasoner reasoner = new GenericRuleReasoner(Rule.rulesFromURL(rulesFileName)); final InfModel infModel = ModelFactory.createInfModel(reasoner, model); final StmtIterator iterator = infModel.listStatements(); while (iterator.hasNext()) { final Statement stmt = iterator.nextStatement(); final Resource subject = stmt.getSubject(); final Property predicate = stmt.getPredicate(); final RDFNode object = stmt.getObject(); log.info(subject.toString() + " " + predicate.toString() + " " + object.toString()); } } catch (final Exception e) { log.error("Encountered an exception while running reasoner.", e); } finally { if (addConnection != null) { addConnection.close(); } if (queryConnection != null) { queryConnection.close(); } if (repo != null) { repo.shutDown(); } } } } /* * (c) Copyright 2009 Talis Information Ltd. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */