Java tutorial
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THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */ package com.idega.util.config; import org.apache.commons.jxpath.JXPathContext; import org.apache.commons.jxpath.Pointer; import org.w3c.dom.Document; import org.w3c.dom.Element; import javax.xml.parsers.DocumentBuilderFactory; import java.io.InputStream; import java.util.HashMap; import java.util.Iterator; import java.util.Map; /** * * Load the configuration in the default XML format from an InputStream. * * @author Flavio Costa <flaviocosta@users.sourceforge.net> * @author Terence Jacyno * @author Modified by: <a href="mailto:civilis@idega.com">Vytautas ivilis</a> */ public class DefaultConfig extends Config { private static final long serialVersionUID = -6643307392754451111L; private final String properties_xpath = "/properties"; private final String property_xpath = "/property"; private final String name_att = "name"; private final String value_att = "value"; /** * Creates and loads a new configuration. * * @param stream * InputStream to read XML data in the default format. */ public DefaultConfig(InputStream stream) throws ConfigException { try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setNamespaceAware(false); factory.setValidating(false); Document document = factory.newDocumentBuilder().parse(stream); JXPathContext context = JXPathContext.newContext(document.getDocumentElement()); for (Iterator iter = context.iteratePointers(properties_xpath); iter.hasNext();) { Pointer pointer = (Pointer) iter.next(); Element properties_el = (Element) pointer.getNode(); String p_name = properties_el.getAttribute(name_att); JXPathContext properties_context = JXPathContext.newContext(properties_el); Map<String, String> properties = load(properties_context, property_xpath, name_att, value_att); getPropertiesMap().put(p_name, properties); } } catch (Exception e) { throw new ConfigException(e); } } /** * Returns the specified configuration section in a hash map. * * @param configContext * the JXPath context holding the configuration. * @param sectionPath * the context relative path to the section. * @param nameAttribute * the name of the attribute to be used as a hash map key. * @param valueAttribute * the name of the attribute to be used as a hash map value. * @return the specified configuration section in a hash map. * @throws Exception * if any error occured during configuration loading. */ private HashMap load(JXPathContext configContext, String sectionPath, String nameAttribute, String valueAttribute) throws Exception { HashMap map = new HashMap(); Iterator iterator = configContext.iteratePointers(sectionPath); while (iterator.hasNext()) { Pointer pointer = (Pointer) iterator.next(); Element element = (Element) pointer.getNode(); map.put(element.getAttribute(nameAttribute), element.getAttribute(valueAttribute)); } return map; } }