/*
    * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
    * the spring framework, http://el4j.sf.net
    * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
    * 1000 Lausanne, Switzerland, http://www.elca.ch
    *
    * EL4J is published under the GNU Lesser General Public License (LGPL)
    * Version 2.1. See http://www.gnu.org/licenses/
    *
   * This program 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 Lesser General Public License for more details.
   *
   * For alternative licensing, please contact info@elca.ch
   */
  package ch.elca.el4j.services.xmlmerge.config;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.util.Enumeration;
  import java.util.Iterator;
  import java.util.LinkedHashSet;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  
  import ch.elca.el4j.services.xmlmerge.ConfigurationException;
  
  /**
   * Reads the {@link ch.elca.el4j.services.xmlmerge.factory.XPathOperationFactory}
   * configuration from a property file or a map.
   *
   * @svnLink $Revision: 3883 $;$Date: 2009-08-04 15:35:01 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/xml_merge/common/src/main/java/ch/elca/el4j/services/xmlmerge/config/PropertyXPathConfigurer.java $
   *
   * @author Laurent Bovet (LBO)
   * @author Alex Mathey (AMA)
   */
  public class PropertyXPathConfigurer extends AbstractXPathConfigurer {
  
  	/**
  	 * Default action pathname.
  	 */
  	public static final String DEFAULT_ACTION_KEY = "action.default";
  
  	/**
  	 * Default mapper pathname.
  	 */
  	public static final String DEFAULT_MAPPER_KEY = "mapper.default";
  
  	/**
  	 * Default matcher pathname.
  	 */
  	public static final String DEFAULT_MATCHER_KEY = "matcher.default";
  
  	/**
  	 * XPath pathname prefix.
  	 */
  	public static final String PATH_PREFIX = "xpath.";
  
  	/**
  	 * Mapper pathname prefix.
  	 */
  	public static final String MAPPER_PREFIX = "mapper.";
  
  	/**
  	 * Matcher pathname prefix.
  	 */
  	public static final String MATCHER_PREFIX = "matcher.";
  
  	/**
  	 * Action pathname prefix.
  	 */
  	public static final String ACTION_PREFIX = "action.";
  	
  	/**
  	 * Configuration properties.
  	 */
  	Properties m_props;
  
  	/**
  	 * Set of XPath paths.
  	 */
  	Set m_paths = new LinkedHashSet();
  
  	/**
  	 * Creates a PropertyXPathConfigurer which reads the configuration from a
  	 * properties file.
  	 *
  	 * @param propString
  	 *            A string representing the name of a properties file
  	 * @throws ConfigurationException
  	 *             If an error occurred during the creation of the
  	 *             configurer
  	 */
  	public PropertyXPathConfigurer(String propString)
  		throws ConfigurationException {
  		m_props = new Properties();
  		try {
 			m_props.load(new ByteArrayInputStream(propString.getBytes()));
 		} catch (IOException ioe) {
 			// Should not happen
 			throw new ConfigurationException(ioe);
 		}
 	}
 
 	/**
 	 * Creates a PropertyXPathConfigurer which reads the configuration from a
 	 * map.
 	 *
 	 * @param map
 	 *            A map containing configuration properties
 	 */
 	public PropertyXPathConfigurer(Map map) {
 		m_props = new Properties();
 		m_props.putAll(map);
 	}
 
 	/**
 	 * Creates a PropertyXPathConfigurer which reads the configuration from a
 	 * <code>Properties</code> object.
 	 *
 	 * @param properties
 	 *            The configuration properties
 	 */
 	public PropertyXPathConfigurer(Properties properties) {
 		m_props = properties;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
 	protected void readConfiguration() throws ConfigurationException {
 		String token;
 
 		token = m_props.getProperty(DEFAULT_ACTION_KEY);
 		if (token != null) {
 			setDefaultAction(token);
 		}
 
 		token = m_props.getProperty(DEFAULT_MAPPER_KEY);
 		if (token != null) {
 			setDefaultMapper(token);
 		}
 
 		token = m_props.getProperty(DEFAULT_MATCHER_KEY);
 		if (token != null) {
 			setDefaultMatcher(token);
 		}
 
 		Enumeration keys = m_props.keys();
 
 		while (keys.hasMoreElements()) {
 			String key = (String) keys.nextElement();
 
 			if (key.startsWith(PATH_PREFIX)) {
 				m_paths.add(key.substring(PATH_PREFIX.length()));
 			}
 		}
 
 		Iterator it = m_paths.iterator();
 		while (it.hasNext()) {
 			String path = (String) it.next();
 
 			token = m_props.getProperty(ACTION_PREFIX + path);
 			if (token != null) {
 				addAction(m_props.getProperty(PATH_PREFIX + path), token);
 			}
 			token = m_props.getProperty(MAPPER_PREFIX + path);
 			if (token != null) {
 				addMapper(m_props.getProperty(PATH_PREFIX + path), token);
 			}
 			token = m_props.getProperty(MATCHER_PREFIX + path);
 			if (token != null) {
 				addMatcher(m_props.getProperty(PATH_PREFIX + path), token);
 			}
 		}
 
 	}
 
 }