Metacat

/**

 *  '$RCSfile: XSLTransform.java,v $'

 *  Copyright: 2003 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *

 *   '$Author: jones $'

 *     '$Date: 2003/08/18 20:27:03 $'

 * '$Revision: 1.4 $'

 *

 * This program 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 2 of the License, or

 * (at your option) any later version.

 *

 * 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.util;

import java.io.*;

import java.util.Enumeration;

import java.util.Hashtable;

import org.apache.log4j.Logger;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.Transformer;

import javax.xml.transform.stream.StreamSource;

import javax.xml.transform.stream.StreamResult;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerConfigurationException;

import javax.xml.transform.URIResolver;

/**

 * A Class that transforms older eml version to newer eml version utitlizing XSL style sheets. 

 */

public class EMLVersionsTransformer {

	private static Logger logMetacat = Logger.getLogger(GeoserverUtil.class);

    /**

     * Public constructor because all methods are static and do not need 

     * an instance.

     */

    private EMLVersionsTransformer() 

    {

    }

    /*

     * Transform an XML document using an XSLT stylesheet to another format,

     * probably HTML or another XML document format.

     *

     * @param docString the document to be transformed

     * @param xslSystemId the system location of the stylesheet

     * @param pw the PrintWriter to which output is printed

     * @param params some parameters for inclusion to the transformation

     */

    private static void transform(String docString, String xslSystemId,

        Writer pw, Hashtable param) throws Exception

    {

        transform(new StringReader(docString), xslSystemId, pw, param);

    }

    /*

     * Transform an XML document using an XSLT stylesheet to another format,

     * probably HTML or another XML document format.

     *

     * @param doc the document to be transformed

     * @param xslSystemId the system location of the stylesheet

     * @param pw the PrintWriter to which output is printed

     * @param params some parameters for inclusion to the transformation

     */

    private static void transform(Reader doc, String xslSystemId,

        Writer pw, Hashtable param) throws Exception

    {

            StreamSource xslSource = 

                new StreamSource(xslSystemId);

            xslSource.setSystemId(xslSystemId);

            // Create a stylesheet from the system id that was found

            TransformerFactory tFactory = TransformerFactory.newInstance();

            Transformer transformer = tFactory.newTransformer(xslSource);

            // Set up parameters for transformation

            if ( param != null) {

                Enumeration en = param.keys();

                while (en.hasMoreElements()) {

                    String key =(String)en.nextElement();

                    String value = ((String)(param.get(key)));

                    transformer.setParameter(key, value);

                }

            }

            // Run the transform engine

            StreamSource ss = new StreamSource(doc);

            StreamResult sr = new StreamResult(pw);

            transformer.transform(ss, sr);

    }

    /*

     * Transform single eml201 doc to eml 210 doc

     */

    private static void transformEML201ToEML210(Reader reader, String xslfile, Writer writer, String packageid) throws Exception{    

        	Hashtable param = null;

            if (packageid != null)

            {

            	param = new Hashtable();

            	param.put("package-id", packageid);

            }

             EMLVersionsTransformer.transform(reader, xslfile, writer, param);

        }

}