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package eu.dnetlib.data.search.transform;
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import org.apache.log4j.Logger;
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import javax.xml.transform.TransformerConfigurationException;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.TransformerFactoryConfigurationError;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.stream.StreamSource;
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import java.io.StringReader;
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import java.io.StringWriter;
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public class XsltTransformer implements Transformer {
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private final String xslt;
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private final Logger logger = Logger.getLogger(XsltTransformer.class);
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private javax.xml.transform.Transformer xmlTransformer = null;
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private StringWriter xmlResultResource = new StringWriter();
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public XsltTransformer(String xslt) throws TransformerConfigurationException, TransformerFactoryConfigurationError {
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this.xslt = xslt;
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//logger.debug(xslt);
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synchronized(this) {
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xmlTransformer = TransformerFactory.newInstance().newTemplates(new StreamSource(new StringReader(xslt))).newTransformer();
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xmlTransformer.setOutputProperty("encoding", "UTF-8");
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}
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}
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@Override
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public synchronized String transform(String input) throws TransformerException {
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//logger.debug("Transforming input: " + input);
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//logger.debug("xsl >>>>" + xslt);
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xmlResultResource.getBuffer().setLength(0);
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try {
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xmlTransformer.transform(new StreamSource(new StringReader(input)), new StreamResult(xmlResultResource));
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} catch (javax.xml.transform.TransformerException e) {
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logger.warn("Error transforming xml: " + input, e);
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throw new TransformerException("Error transforming xml: " + input, e);
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}
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return xmlResultResource.getBuffer().toString();
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}
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public String getXslt() {
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return xslt;
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}
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}
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