org.nhindirect.xd.transform.util.XslConversion Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of xd-common Show documentation
Library for common XD* operations and objects
There is a newer version: 8.0.0
/* 
 * Copyright (c) 2010, NHIN Direct Project
 * All rights reserved.
 *  
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution.  
 * 3. Neither the name of the the NHIN Direct Project (nhindirect.org)
 *    nor the names of its contributors may be used to endorse or promote products 
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.nhindirect.xd.transform.util;

import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.InputStream;
import java.sql.Timestamp;
import java.util.Hashtable;

import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * XSL conversion utilities.
 */
public class XslConversion
{

    private static Hashtable conversions = new Hashtable(10);

    private static final Log LOGGER = LogFactory.getFactory().getInstance(XslConversion.class);

    /**
     * Default constructor.
     */
    public XslConversion()
    {}

    /**
     * Perform the XSL conversion using the provided map file and message.
     * 
     * @param mapFile
     *            The map file.
     * @param message
     *            The message.
     * @return an XSL conversion.
     * @throws Exception
     */
    public String run(String mapFile, String message) throws Exception
    {
        long start = System.currentTimeMillis();

        String retXml = "";
        Transformer transformer = null;

        try
        {
            if (conversions.containsKey(mapFile))
            {
                Templates temp = conversions.get(mapFile);
                transformer = temp.newTransformer();
                LOGGER.info("From xsl cache");
            }
            else
            {
                synchronized (conversions)
                {
                    if (!conversions.containsKey(mapFile))
                    {
                        /*
                         * Use the static TransformerFactory.newInstance()
                         * method to instantiate a TransformerFactory. The
                         * javax.xml.transform.TransformerFactory system
                         * property setting determines the actual class to
                         * instantiate --
                         * org.apache.xalan.transformer.TransformerImpl.
                         */
                        TransformerFactory tFactory = TransformerFactory.newInstance();

                        /*
                         * Use the TransformerFactory to instantiate a Template
                         * that is thread safe for use in generating Transfomers
                         */
                        InputStream is = this.getClass().getClassLoader().getResourceAsStream(mapFile);

                        if (is == null)
                        {
                            LOGGER.info("Mapfile did not read " + mapFile);
                        }

                        Templates temp = tFactory.newTemplates(new StreamSource(is));
                        transformer = temp.newTransformer();
                        conversions.put(mapFile, temp);
                    }
                }
            }

            CharArrayWriter to = new CharArrayWriter();
            transformer.transform(new StreamSource(new CharArrayReader(message.toCharArray())), new StreamResult(to));
            retXml = to.toString();
        }
        catch (TransformerConfigurationException e)
        {
            LOGGER.error("Exception occured during XSL conversion", e);
            throw e;
        }
        catch (TransformerException e)
        {
            LOGGER.error("Exception occured during XSL conversion", e);
            throw e;
        }

        if (LOGGER.isInfoEnabled())
        {
            long elapse = System.currentTimeMillis() - start;

            LOGGER.info("Started at " + new Timestamp(start).toString());
            LOGGER.info("Elapsed conversion time was " + elapse + "ms");
        }

        return retXml;
    }

}