D-Net

package eu.dnetlib.data.mapreduce.hbase.statsExport.utils;

import org.apache.commons.io.IOUtils;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.stream.StreamResult;

import javax.xml.transform.stream.StreamSource;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.nio.charset.StandardCharsets;

public class ContextTransformer {

    public String transformXSL(String xml) throws Exception {

        Transformer transformer;

        TransformerFactory tFactory = TransformerFactory.newInstance();

        if (xml == null) {

            throw new IllegalArgumentException("Input xml should not be null!");

        }

        InputStream inputStream = null;

        ByteArrayInputStream readerStream = null;

        ByteArrayOutputStream writerStream = null;

        try {

            inputStream = ClassLoader.getSystemResourceAsStream("eu/dnetlib/data/mapreduce/hbase/statsExport/" + "context.xsl");

            transformer = tFactory.newTransformer(new StreamSource(inputStream));

            readerStream = new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8));

            writerStream = new ByteArrayOutputStream();

            transformer.transform(new StreamSource(readerStream), new StreamResult(writerStream));

            return writerStream.toString("UTF8");

        } finally {

            IOUtils.closeQuietly(inputStream);

            IOUtils.closeQuietly(readerStream);

            IOUtils.closeQuietly(writerStream);

        }

    }

}