org.sakaibrary.xserver.XMLTransform.java Source code

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Here is the source code for org.sakaibrary.xserver.XMLTransform.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2006, 2007, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **********************************************************************************/

package org.sakaibrary.xserver;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
import org.w3c.dom.Document;

// For write operation
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import java.io.*;

public class XMLTransform {
    private static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory
            .getLog("org.sakaibrary.xserver.XMLTransform");

    private Document document;
    private String xslFileName;
    private ByteArrayOutputStream xml;
    private ByteArrayOutputStream transformedXml;

    public XMLTransform(String xslFile, ByteArrayOutputStream xml) {
        xslFileName = xslFile;
        this.xml = xml;
    }

    public ByteArrayOutputStream transform() {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

        try {
            InputStream stylesheet = this.getClass().getResourceAsStream(xslFileName);

            DocumentBuilder builder = factory.newDocumentBuilder();
            document = builder.parse(new ByteArrayInputStream(xml.toByteArray()));

            // Use a Transformer for output
            TransformerFactory tFactory = TransformerFactory.newInstance();
            StreamSource stylesource = new StreamSource(stylesheet);
            Transformer transformer = tFactory.newTransformer(stylesource);

            transformedXml = new ByteArrayOutputStream();
            StreamResult result = new StreamResult(transformedXml);

            DOMSource source = new DOMSource(document);

            transformer.transform(source, result);
        } catch (TransformerConfigurationException tce) {
            // Error generated by the parser
            LOG.warn("XMLTransform.transform() - TransformerFactory error: " + tce.getMessage());
        } catch (TransformerException te) {
            // Error generated by the parser
            LOG.warn("XMLTransform.transform() - Transformation error: " + te.getMessage());
        } catch (SAXException sxe) {
            // Error generated by this application
            // (or a parser-initialization error)
            Exception x = sxe;

            if (sxe.getException() != null) {
                x = sxe.getException();
            }

            LOG.warn("XMLTransform.transform() SAX exception: " + sxe.getMessage(), x);
        } catch (ParserConfigurationException pce) {
            // Parser with specified options can't be built
            LOG.warn("XMLTransform.transform() SAX parser cannot be built with " + "specified options");
        } catch (IOException ioe) {
            // I/O error
            LOG.warn("XMLCleanup.cleanup() IO exception", ioe);
        }

        return transformedXml;
    } // main
}