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.daft_ie; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.math.BigDecimal; import java.math.BigInteger; import java.net.MalformedURLException; import java.net.URL; import java.nio.charset.Charset; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Locale; import javax.xml.bind.DatatypeConverter; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; import javax.xml.parsers.ParserConfigurationException; import org.apache.commons.lang3.StringUtils; import org.openestate.io.core.LocaleUtils; import org.openestate.io.core.XmlUtils; import org.openestate.io.core.XmlValidationHandler; import org.openestate.io.daft_ie.xml.ObjectFactory; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.w3c.dom.Document; import org.xml.sax.SAXException; /** * Some helper functions for the XML format of * <a href="http://daft.ie/">daft.ie</a>. * * @since 1.0 * @author Andreas Rudolph */ public class DaftIeUtils { private final static Logger LOGGER = LoggerFactory.getLogger(DaftIeUtils.class); private static JAXBContext JAXB = null; /** * the latest implemented version of this format */ public final static DaftIeVersion VERSION = DaftIeVersion.V2_7; /** * the XML target namespace of this format */ public final static String NAMESPACE = StringUtils.EMPTY; /** * the default locale of this format */ public final static Locale DEFAULT_LOCALE = Locale.ENGLISH; /** * the package, where generated JAXB classes are located */ public final static String PACKAGE = "org.openestate.io.daft_ie.xml"; /** * the factory for creation of JAXB objects */ public final static ObjectFactory FACTORY = new ObjectFactory(); private DaftIeUtils() { } /** * Creates a {@link DaftIeDocument} from an {@link InputStream}. * * @param input * XML input * * @return * created document or null, of the document is not supported by this format * * @throws SAXException * if XML is invalid * * @throws IOException * if reading failed * * @throws ParserConfigurationException * if the parser is not properly configured */ public static DaftIeDocument createDocument(InputStream input) throws SAXException, IOException, ParserConfigurationException { return createDocument(XmlUtils.newDocument(input, true)); } /** * Creates a {@link DaftIeDocument} from a {@link File}. * * @param xmlFile * XML file * * @return * created document or null, of the document is not supported by this format * * @throws SAXException * if XML is invalid * * @throws IOException * if reading failed * * @throws ParserConfigurationException * if the parser is not properly configured */ public static DaftIeDocument createDocument(File xmlFile) throws SAXException, IOException, ParserConfigurationException { return createDocument(XmlUtils.newDocument(xmlFile, true)); } /** * Creates a {@link DaftIeDocument} from a {@link String}. * * @param xmlString * XML string * * @return * created document or null, of the document is not supported by this format * * @throws SAXException * if XML is invalid * * @throws IOException * if reading failed * * @throws ParserConfigurationException * if the parser is not properly configured */ public static DaftIeDocument createDocument(String xmlString) throws SAXException, IOException, ParserConfigurationException { return createDocument(XmlUtils.newDocument(xmlString, true)); } /** * Creates a {@link DaftIeDocument} from a {@link Document}. * * @param doc * XML document * * @return * created document or null, of the document is not supported by this format */ public static DaftIeDocument createDocument(Document doc) { if (DaftIeDocument.isReadable(doc)) return new DaftIeDocument(doc); else return null; } /** * Creates a {@link Marshaller} to write JAXB objects into XML. * * @return * created marshaller * * @throws JAXBException * if a problem with JAXB occured */ public static Marshaller createMarshaller() throws JAXBException { return createMarshaller(Charset.defaultCharset().name(), true); } /** * Creates a {@link Marshaller} to write JAXB objects into XML. * * @param encoding * encoding of written XML * * @param formatted * if written XML is pretty printed * * @return * created marshaller * * @throws JAXBException * if a problem with JAXB occured */ public static Marshaller createMarshaller(String encoding, boolean formatted) throws JAXBException { Marshaller m = getContext().createMarshaller(); m.setProperty(Marshaller.JAXB_ENCODING, encoding); m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, formatted); m.setEventHandler(new XmlValidationHandler()); return m; } /** * Creates a {@link Unmarshaller} to read JAXB objects from XML. * * @return * created unmarshaller * * @throws JAXBException * if a problem with JAXB occured */ public static Unmarshaller createUnmarshaller() throws JAXBException { Unmarshaller m = getContext().createUnmarshaller(); m.setEventHandler(new XmlValidationHandler()); return m; } /** * Returns the {@link JAXBContext} for this format. * * @return * context * * @throws JAXBException * if a problem with JAXB occured */ public synchronized static JAXBContext getContext() throws JAXBException { if (JAXB == null) initContext(Thread.currentThread().getContextClassLoader()); return JAXB; } /** * Returns a country name, as it is preferred by this format. * * @param country * country name to convert * * @return * converted country name or null, if no matching country was found */ public static String getCountryName(String country) { return LocaleUtils.getCountryName(country, DEFAULT_LOCALE); } /** * Returns the preferred date format for this format. * * @return * date format */ public static DateFormat getDateFormat() { return new SimpleDateFormat("yyyy-MM-dd"); } /** * Returns the {@link ObjectFactory} for this format. * * @return * object factory */ public synchronized static ObjectFactory getFactory() { return FACTORY; } /** * Intializes the {@link JAXBContext} for this format. * * @param classloader * the classloader to load the generated JAXB classes with * * @throws JAXBException * if a problem with JAXB occured */ public synchronized static void initContext(ClassLoader classloader) throws JAXBException { JAXB = JAXBContext.newInstance(PACKAGE, classloader); } public static Boolean parseBoolean(String value) { value = StringUtils.trimToEmpty(value); if ("1".equals(value)) return Boolean.TRUE; else if ("0".equals(value)) return Boolean.FALSE; else throw new IllegalArgumentException("Can't parse boolean value '" + value + "'!"); } public static String parseCountry(String value) { return StringUtils.trimToNull(value); } public static Calendar parseDate(String value) { return XmlUtils.parseDate(value); } public static Calendar parseDateTime(String value) { return XmlUtils.parseDateTime(value); } public static BigDecimal parsePositiveDecimal(String value) { value = StringUtils.trimToNull(value); return (value != null) ? DatatypeConverter.parseDecimal(value) : null; } public static BigInteger parsePositiveInteger(String value) { value = StringUtils.trimToNull(value); return (value != null) ? DatatypeConverter.parseInteger(value) : null; } public static URL parseURL(String value) { value = StringUtils.trimToNull(value); if (value == null) return null; try { if (!StringUtils.startsWithIgnoreCase(value, "http://") && !StringUtils.startsWithIgnoreCase(value, "https://")) return new URL("http://" + value); else return new URL(value); } catch (MalformedURLException ex) { throw new IllegalArgumentException("Can't parse URL value '" + value + "'!", ex); } } public static String printBoolean(Boolean value) { if (Boolean.TRUE.equals(value)) return "1"; else if (Boolean.FALSE.equals(value)) return "0"; else throw new IllegalArgumentException("Can't print boolean value!"); } public static String printCountry(String value) { value = StringUtils.trimToNull(value); if (value == null) throw new IllegalArgumentException("Can't print country value!"); String country = StringUtils.trimToNull(DaftIeUtils.getCountryName(value)); if (country == null) { LOGGER.warn("Can't convert country '" + value + "' to its english name!"); return value; } else { return country; } } public static String printDate(Calendar value) { if (value == null) throw new IllegalArgumentException("Can't print date value!"); else return getDateFormat().format(value.getTime()); } public static String printDateTime(Calendar value) { if (value == null) throw new IllegalArgumentException("Can't print date-time value!"); else return DatatypeConverter.printDateTime(value); } public static String printPositiveDecimal(BigDecimal value) { if (value == null || value.compareTo(BigDecimal.ZERO) < 1) throw new IllegalArgumentException("Can't print positive double value!"); else return DatatypeConverter.printDecimal(value); } public static String printPositiveInteger(BigInteger value) { if (value == null || value.compareTo(BigInteger.ZERO) < 1) throw new IllegalArgumentException("Can't print positive integer value!"); else return DatatypeConverter.printInteger(value); } public static String printURL(URL value) { if (value == null) throw new IllegalArgumentException("Can't print URL value!"); else return value.toString(); } }