/**
 *
 */
package de.intevation.gnv.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.StringBufferInputStream;
import java.io.UnsupportedEncodingException;

import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.log4j.Logger;
import org.w3c.dom.Node;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 *
 */
public class XSLTransformer {
    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(XSLTransformer.class);
    /**
     * Constructor
     */
    public XSLTransformer() {
        super();
    }
    
    public String transform(Node toTransform, String encoding, String templateFileName){
        String resultValue = null;
            try {
                XMLUtils xmlUtils = new XMLUtils();
                Source templateSource = new StreamSource(new File(templateFileName));
                TransformerFactory xformFactory = TransformerFactory.newInstance();
                Transformer transformer = xformFactory.newTransformer(templateSource);
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                StreamResult scrResult =  new StreamResult(baos);
                log.debug(xmlUtils.writeNode2String(toTransform));
                DOMSource source = new DOMSource(toTransform);
                transformer.transform(source, scrResult);
                resultValue = new String(baos.toByteArray(),encoding);
            } catch (TransformerConfigurationException e) {
                log.error(e,e);
            } catch (UnsupportedEncodingException e) {
                log.error(e,e);
            } catch (TransformerFactoryConfigurationError e) {
                log.error(e,e);
            } catch (TransformerException e) {
                log.error(e,e);
            }
        
        return resultValue;
    }

}