D-Net

package eu.dnetlib.msro.eagle.workflows.nodes.transform.editions;

import java.io.IOException;

import java.io.StringReader;

import java.util.Map;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.Node;

import org.dom4j.io.SAXReader;

import org.springframework.core.io.ClassPathResource;

import eu.dnetlib.miscutils.functional.UnaryFunction;

import eu.dnetlib.miscutils.functional.xml.ApplyXslt;

public class EditionXsltUnaryFunction implements UnaryFunction<String, String> {

	private static final Log log = LogFactory.getLog(EditionXsltUnaryFunction.class);

	private ApplyXslt xslt;

	private SAXReader reader;

	public EditionXsltUnaryFunction(final String xsltClasspath, Map<String, String> xsltParams) throws IOException {

		this.xslt = new ApplyXslt(new ClassPathResource(xsltClasspath), xsltParams);

		this.reader = new SAXReader();

	}

	/**

	 * xPath the <metadata> node and applies xslt 2.0 transformation

	 */

	@Override

	public String evaluate(String input) {

		try {

			Document doc = reader.read(new StringReader(input));

			Node result = doc.selectSingleNode("//*[local-name()='metadata']/*");

			String edition = xslt.evaluate(result.asXML());

			result.detach();

			((Element) doc.selectSingleNode("//*[local-name()='metadata']")).add(reader.read(new StringReader(edition)).getRootElement());

			return doc.asXML();

		} catch (DocumentException e) {

			log.error("Problem creating dom4j document from \n" + input, e);

			throw new RuntimeException(e);

		}

	}

}