| /** |
| * 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.benchmark.query; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import javax.xml.XMLConstants; |
| import javax.xml.bind.JAXBContext; |
| import javax.xml.bind.JAXBException; |
| import javax.xml.bind.Unmarshaller; |
| import javax.xml.parsers.DocumentBuilder; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import javax.xml.parsers.ParserConfigurationException; |
| import javax.xml.transform.stream.StreamSource; |
| import javax.xml.validation.Schema; |
| import javax.xml.validation.SchemaFactory; |
| |
| import org.apache.rya.api.utils.XmlFactoryConfiguration; |
| import org.xml.sax.SAXException; |
| |
| import com.google.common.base.Supplier; |
| import com.google.common.base.Suppliers; |
| |
| import edu.umd.cs.findbugs.annotations.DefaultAnnotation; |
| import edu.umd.cs.findbugs.annotations.NonNull; |
| |
| /** |
| * Unmarshalls instances of {@link QueriesBenchmarkConf}. |
| */ |
| @DefaultAnnotation(NonNull.class) |
| public final class QueriesBenchmarkConfReader { |
| |
| // It is assumed the schema file is held within the root directory of the packaged jar. |
| private static final String SCHEMA_LOCATION = "queries-benchmark-conf.xsd"; |
| |
| // Only load the Schema once. |
| private static final Supplier<Schema> SCHEMA_SUPPLIER = Suppliers.memoize( |
| new Supplier<Schema>() { |
| @Override |
| public Schema get() { |
| final InputStream schemaStream = ClassLoader.getSystemResourceAsStream(SCHEMA_LOCATION); |
| final SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); |
| try { |
| return schemaFactory.newSchema( new StreamSource( schemaStream ) ); |
| } catch (final SAXException e) { |
| throw new RuntimeException("Could not load the '" + SCHEMA_LOCATION + "' schema file. Make sure it is on the classpath.", e); |
| } finally { |
| if (schemaStream != null) { |
| try { |
| schemaStream.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |
| }); |
| |
| /** |
| * Unmarshall an instance of {@link QueriesBenchmarkConf} from the XML that |
| * is retrieved from an {@link InputStream}. |
| * |
| * @param xmlStream - The input stream holding the XML. (not null) |
| * @return The {@link BenchmarkQueries} instance that was read from the stream. |
| * @throws JAXBException There was a problem with the formatting of the XML. |
| * @throws ParserConfigurationException There was a problem creating the DocumentBuilder. |
| * @throws IOException There was a problem reading the xmlStream. |
| * @throws SAXException There was a problem parsing the xmlStream. |
| */ |
| public QueriesBenchmarkConf load(final InputStream xmlStream) throws JAXBException, ParserConfigurationException, SAXException, IOException { |
| requireNonNull(xmlStream); |
| |
| // Load the schema that describes the stream. |
| final Schema schema = SCHEMA_SUPPLIER.get(); |
| |
| // Unmarshal the object from the stream. |
| final JAXBContext context = JAXBContext.newInstance( QueriesBenchmarkConf.class ); |
| final Unmarshaller unmarshaller = context.createUnmarshaller(); |
| unmarshaller.setSchema(schema); |
| final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
| XmlFactoryConfiguration.harden(dbf); |
| final DocumentBuilder db = dbf.newDocumentBuilder(); |
| return (QueriesBenchmarkConf) unmarshaller.unmarshal(db.parse(xmlStream)); |
| } |
| } |