Java tutorial
/* Copyright (c) 2010 Ministry of the Interior and Kingdom Relations, * the Netherlands. All rights reserved. * * This file is part of the MinBZK Search Enricher indexing generator. * * Search Enricher is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Search Enricher is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Search Enricher. If not, see <http://www.gnu.org/licenses/>. */ package nl.minbzk.dwr.zoeken.enricher.util; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.Writer; import java.util.Properties; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.util.DefaultPropertiesPersister; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; /** * Properties persister which aids in resolving placeholders as Catalina context Environment parameters. Note that the persister does not actually persist anything; it only does retrievals. * * @author Jasper van Veghel <j.veghel@rijksoverheid.nl> */ public class CatalinaContextPropertiesPersister extends DefaultPropertiesPersister { /** * The logger. */ private static final Logger logger = LoggerFactory.getLogger(CatalinaContextPropertiesPersister.class); /** * Override XML loading so to inject all Catalina context properties. * * @param props * @param is */ @Override public void loadFromXml(final Properties props, final InputStream is) { props.putAll(retrieveContextProperties(is)); } /** * Retrieve all context key/value pairs as a Properties set. * * @param inputStream * @return Properties */ private Properties retrieveContextProperties(final InputStream inputStream) { Properties result = new Properties(); try { Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(inputStream); // Normalize the document document.getDocumentElement().normalize(); // Parse the document content NodeList environmentNodes = document.getElementsByTagName("Environment"); for (int s = 0; s < environmentNodes.getLength(); s++) { Node node = environmentNodes.item(s); if (node.getNodeType() == Node.ELEMENT_NODE) result.setProperty(((Element) node).getAttribute("name"), ((Element) node).getAttribute("value")); } } catch (ParserConfigurationException e) { logger.error(getClass().getName(), e); } catch (SAXException e) { logger.error(getClass().getName(), e); } catch (IOException e) { logger.error(getClass().getName(), e); } return result; } @Override public void store(final Properties props, final OutputStream os, final String header) throws IOException { // Do nothing } @Override public void store(final Properties props, final Writer writer, final String header) throws IOException { // Do nothing } @Override public void storeToXml(final Properties props, final OutputStream os, final String header) throws IOException { // Do nothing } @Override public void storeToXml(final Properties props, final OutputStream os, final String header, final String encoding) throws IOException { // Do nothing } }