Metacat

/**

 *  '$RCSfile$'

 *  Copyright: 2005 University of New Mexico and the 

 *             Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *   '$Author: daigle $'

 *     '$Date: 2008-07-06 21:25:34 -0700 (Sun, 06 Jul 2008) $'

 * '$Revision: 4080 $'

 *

 * 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.advancedsearch;

import java.io.*;

import javax.xml.transform.Result;

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 org.apache.log4j.Logger;

import edu.ucsb.nceas.metacat.util.SystemUtil;

import edu.ucsb.nceas.utilities.PropertyNotFoundException;

/**

 * @author dcosta

 * 

 * Stylizer class applies the resultset.xsl stylesheet to the pathquery

 * results returned by Metacat.

 */

public class Stylizer {

	private Logger logMetacat = Logger.getLogger(Stylizer.class);

	/**

	 * Applies the resultset.xsl stylesheet to the pathquery result string

	 * returned by Metacat.

	 * 

	 * @param resultset       the pathquery result string from Metacat

	 * @param sessionId       the user's session id

	 * @param metacatURL      the URL to the Metacat server

	 * @param qformat         The qformat (skin) to use when displaying results.

	 * @param xslPath         File path to the resultset.xsl stylesheet.

	 * 

	 * @return htmlString     the result of the transformation from XML to HTML

	 */

	public String resultsetToHTML(final String resultset, final String sessionId,

			final String metacatURL, final String qformat, final String xslPath) {

		String htmlString = "";

		Result result;

		StringWriter stringWriter = new StringWriter();

		Transformer transformer;

		TransformerFactory transformerFactory;

		Source xmlSource;

		File xsltFile = new File(xslPath);

		Source xsltSource;

		StringReader stringReader = new StringReader(resultset);

		xmlSource = new javax.xml.transform.stream.StreamSource(stringReader);

		xsltSource = new javax.xml.transform.stream.StreamSource(xsltFile);

		result = new javax.xml.transform.stream.StreamResult(stringWriter);

		// create an instance of TransformerFactory

		transformerFactory = TransformerFactory.newInstance();

		try {

			transformer = transformerFactory.newTransformer(xsltSource);

			String contextURL = SystemUtil.getContextURL();

			transformer.setParameter("contextURL", contextURL);

			if (sessionId != null) {

				transformer.setParameter("sessid", sessionId);

			}

			transformer.setParameter("metacatURL", metacatURL);

			if ((qformat != null) && (!qformat.equals(""))) {

				transformer.setParameter("qformat", qformat);

			}

			transformer.transform(xmlSource, result);

			htmlString = stringWriter.toString();

		} catch (TransformerConfigurationException tce) {

			// Error generated by the parser

			Throwable x = tce; // Use the contained exception, if any

			if (tce.getException() != null) {

				x = tce.getException();

			}

			x.printStackTrace();

		} catch (TransformerException te) {

			// Error generated by the parser

			Throwable x = te; // Use the contained exception, if any

			if (te.getException() != null) {

				x = te.getException();

			}

			x.printStackTrace();

		} catch (PropertyNotFoundException pnfe) {

			pnfe.printStackTrace();

		}

		return htmlString;

	}

}