Java tutorial
/* * Copyright 2015-2016 OpenEstate.org. * * Licensed 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.openestate.io.examples; import java.io.File; import java.io.IOException; import java.io.InputStream; import javax.xml.bind.JAXBException; import javax.xml.parsers.ParserConfigurationException; import org.apache.commons.lang3.StringUtils; import org.apache.log4j.PropertyConfigurator; import org.openestate.io.daft_ie.DaftIeDocument; import org.openestate.io.daft_ie.DaftIeUtils; import org.openestate.io.daft_ie.xml.Daft; import org.openestate.io.daft_ie.xml.OverseasRentalAdType; import org.openestate.io.daft_ie.xml.OverseasSaleAdType; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.xml.sax.SAXException; /** * Example for reading XML files for <a href="http://daft.ie">daft.ie</a>. * <p> * This example illustrates how to read XML files for * <a href="http://daft.ie">daft.ie</a>. * * @since 1.0 * @author Andreas Rudolph */ public class DaftIeReadingExample { private final static Logger LOGGER = LoggerFactory.getLogger(DaftIeReadingExample.class); private final static String PACKAGE = "/org/openestate/io/examples"; /** * Start the example application. * * @param args * command line arguments */ public static void main(String[] args) { // init logging PropertyConfigurator.configure(DaftIeReadingExample.class.getResource(PACKAGE + "/log4j.properties")); // read example files, if no files were specified as command line arguments if (args.length < 1) { try { read(DaftIeReadingExample.class.getResourceAsStream(PACKAGE + "/daft_ie.xml")); } catch (Exception ex) { LOGGER.error("Can't read example file!"); LOGGER.error("> " + ex.getLocalizedMessage(), ex); System.exit(2); } } // read files, that were specified as command line arguments else { for (String arg : args) { try { read(new File(arg)); } catch (Exception ex) { LOGGER.error("Can't read file '" + arg + "'!"); LOGGER.error("> " + ex.getLocalizedMessage(), ex); System.exit(2); } } } } /** * Read a {@link File} into a {@link DaftIeDocument} and print some of its * content to console. * * @param xmlFile * the file to read * * @throws SAXException * if the file is not readable by the XML parser * * @throws IOException * if the file is not readable * * @throws ParserConfigurationException * if the XML parser is improperly configured * * @throws JAXBException * if XML conversion into Java objects failed */ protected static void read(File xmlFile) throws SAXException, IOException, ParserConfigurationException, JAXBException { LOGGER.info("process file: " + xmlFile.getAbsolutePath()); if (!xmlFile.isFile()) { LOGGER.warn("> provided file is invalid"); return; } DaftIeDocument doc = DaftIeUtils.createDocument(xmlFile); if (doc == null) { LOGGER.warn("> provided XML is not supported"); } else { printToConsole(doc); } } /** * Read a {@link InputStream} into an {@link DaftIeDocument} and print some * of its content to console. * * @param xmlInputStream * the input stream to read * * @throws SAXException * if the file is not readable by the XML parser * * @throws IOException * if the file is not readable * * @throws ParserConfigurationException * if the XML parser is improperly configured * * @throws JAXBException * if XML conversion into Java objects failed */ protected static void read(InputStream xmlInputStream) throws SAXException, IOException, ParserConfigurationException, JAXBException { LOGGER.info("process example file"); DaftIeDocument doc = DaftIeUtils.createDocument(xmlInputStream); if (doc == null) { LOGGER.warn("> provided XML is not supported"); } else { printToConsole(doc); } } /** * Print some content of a {@link DaftIeDocument} to console. * * @param doc * the document to process * * @throws JAXBException * if XML conversion into Java objects failed */ protected static void printToConsole(DaftIeDocument doc) throws JAXBException { LOGGER.info("> process document in version " + doc.getDocumentVersion()); Daft daft = doc.toObject(); // process overseas rental if (daft.getOverseasRental() != null) { for (OverseasRentalAdType ad : daft.getOverseasRental().getOverseasRentalAd()) { // get object nr String objectNr = StringUtils.trimToNull(ad.getExternalId()); if (objectNr == null) objectNr = "???"; // get object description String objectInfo = StringUtils.trimToNull(ad.getDescription()); if (objectInfo == null) objectInfo = "???"; // print object informations to console LOGGER.info("> found object " + "'" + objectNr + "' for rent: " + objectInfo); } } // process overseas sales if (daft.getOverseasSales() != null) { for (OverseasSaleAdType ad : daft.getOverseasSales().getOverseasSaleAd()) { // get object nr String objectNr = StringUtils.trimToNull(ad.getExternalId()); if (objectNr == null) objectNr = "???"; // get object description String objectInfo = StringUtils.trimToNull(ad.getDescription()); if (objectInfo == null) objectInfo = "???"; // print object informations to console LOGGER.info("> found object " + "'" + objectNr + "' for sale: " + objectInfo); } } } }