edu.mayo.xsltserver.Transformer.java Source code

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Here is the source code for edu.mayo.xsltserver.Transformer.java

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/*
 * Copyright: (c) 2004-2011 Mayo Foundation for Medical Education and 
 * Research (MFMER). All rights reserved. MAYO, MAYO CLINIC, and the
 * triple-shield Mayo logo are trademarks and service marks of MFMER.
 *
 * Except as contained in the copyright notice above, or as used to identify 
 * MFMER as the author of this software, the trade names, trademarks, service
 * marks, or product names of the copyright holder shall not be used in
 * advertising, promotion or otherwise in connection with this software without
 * prior written authorization of the copyright holder.
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-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 edu.mayo.xsltserver;

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import java.util.Map.Entry;

import javax.annotation.Resource;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.springframework.stereotype.Component;

/**
 * The XSLT Transformation logic.
 *
 * @author <a href="mailto:kevin.peterson@mayo.edu">Kevin Peterson</a>
 */
@Component
public class Transformer {

    @Resource
    private FileService fileService;

    /**
     * Transform.
     *
     * @param xmlInputStream the xml input stream
     * @param xsltInputStream the xslt input stream
     * @param outputStream the output stream
     * @param parameters the parameters
     */
    public void transform(InputStream xmlInputStream, InputStream xsltInputStream, OutputStream outputStream,
            Map<String, String> parameters) {
        try {
            // Source XML File
            StreamSource xmlFile = new StreamSource(xmlInputStream);

            // Source XSLT Stylesheet
            StreamSource xsltFile = new StreamSource(xsltInputStream);
            TransformerFactory xsltFactory = TransformerFactory.newInstance();

            final URIResolver decoratedResolver = xsltFactory.getURIResolver();

            xsltFactory.setURIResolver(new URIResolver() {

                @Override
                public Source resolve(String href, String base) throws TransformerException {
                    Source source = decoratedResolver.resolve(href,
                            fileService.getStorageDirectory() + File.separator);

                    return source;
                }

            });

            javax.xml.transform.Transformer transformer = xsltFactory.newTransformer(xsltFile);

            if (parameters != null) {
                for (Entry<String, String> entry : parameters.entrySet()) {
                    transformer.setParameter(entry.getKey(), entry.getValue());
                }
            }

            // Send transformed output to the console
            StreamResult resultStream = new StreamResult(outputStream);

            // Apply the transformation
            transformer.transform(xmlFile, resultStream);
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}