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package org.apache.tomcat.util.digester;

import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Create a SAXParser configured to support XML Schema and DTD.
 *
 * @since 1.6
 */

public class GenericParser{

    /**
     * The Log to which all SAX event related logging calls will be made.
     */
    protected static final Logger log = 
            Logger.getLogger("org.apache.tomcat.util.digester.Digester.sax");

    /**
     * The JAXP 1.2 property required to set up the schema location.
     */
    private static final String JAXP_SCHEMA_SOURCE =
        "http://java.sun.com/xml/jaxp/properties/schemaSource";

    /**
     * The JAXP 1.2 property to set up the schemaLanguage used.
     */
    protected static final String JAXP_SCHEMA_LANGUAGE =
        "http://java.sun.com/xml/jaxp/properties/schemaLanguage";

    /**
     * Create a SAXParser configured to support XML Scheman and DTD
     * @param properties parser specific properties/features
     * @return an XML Schema/DTD enabled SAXParser
     */
    public static SAXParser newSAXParser(Properties properties)
            throws ParserConfigurationException, 
                   SAXException,
                   SAXNotRecognizedException{ 

        SAXParserFactory factory = 
                        (SAXParserFactory)properties.get("SAXParserFactory");
        SAXParser parser = factory.newSAXParser();
        String schemaLocation = (String)properties.get("schemaLocation");
        String schemaLanguage = (String)properties.get("schemaLanguage");

        try{
            if (schemaLocation != null) {
                parser.setProperty(JAXP_SCHEMA_LANGUAGE, schemaLanguage);
                parser.setProperty(JAXP_SCHEMA_SOURCE, schemaLocation);
            }
        } catch (SAXNotRecognizedException e){
            if (log.isLoggable(Level.INFO)) {
                log.log(Level.INFO, parser.getClass().getName() + ": "  
                                            + e.getMessage() + " not supported."); 
            }
        }
        return parser;
    }

}