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Classes, interfaces and enums that assist with everyday Java development tasks.
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/*
 * Copyright 2010-2012 Craig S. Dickson (http://craigsdickson.com)
 *
 * 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 com.squeakysand.commons.xml;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

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.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class XsltHelper {

    private static final Logger LOG = LoggerFactory.getLogger(XsltHelper.class);

    public static void transform(File xslFile, File xmlFile, File outputFile) throws XmlProcessingException {
        InputStream xslInput = null;
        InputStream xmlInput = null;
        OutputStream output = null;
        try {
            xslInput = new FileInputStream(xslFile);
            xmlInput = new FileInputStream(xmlFile);
            output = new FileOutputStream(outputFile);
            transform(xslInput, xmlInput, output);
        } catch (FileNotFoundException e) {
            throw new XmlProcessingException(e);
        } finally {
            if (xslInput != null) {
                try {
                    xslInput.close();
                } catch (IOException e) {
                    LOG.warn(e.getMessage(), e);
                }
            }
            if (xmlInput != null) {
                try {
                    xmlInput.close();
                } catch (IOException e) {
                    LOG.warn(e.getMessage(), e);
                }
            }
            if (output != null) {
                try {
                    output.close();
                } catch (IOException e) {
                    LOG.warn(e.getMessage(), e);
                }
            }
        }
    }

    public static void transform(InputStream xslInput, InputStream xmlInput, OutputStream output) throws XmlProcessingException {
        try {
            StreamSource xslSource = new StreamSource(xslInput);
            TransformerFactory tFactory = TransformerFactory.newInstance();
            Transformer transformer = tFactory.newTransformer(xslSource);
            StreamSource xmlSource = new StreamSource(xmlInput);
            OutputStreamWriter out = new OutputStreamWriter(output, "UTF-8");
            StreamResult result = new StreamResult(out);
            transformer.transform(xmlSource, result);
        } catch (TransformerConfigurationException e) {
            throw new XmlProcessingException(e);
        } catch (UnsupportedEncodingException e) {
            throw new XmlProcessingException(e);
        } catch (TransformerException e) {
            throw new XmlProcessingException(e);
        }
    }

    private XsltHelper() {
    }

}