D-Net

package eu.dnetlib.validator.service.impls.valobjs;

import java.io.StringWriter;

import javax.xml.transform.Result;

import javax.xml.transform.Source;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerConfigurationException;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.TransformerFactoryConfigurationError;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathExpression;

import javax.xml.xpath.XPathExpressionException;

import javax.xml.xpath.XPathFactory;

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

import org.w3c.dom.NodeList;

import eu.dnetlib.validator.engine.data.DataException;

/**

 * Indicates that a Validation Object is actually an xml text.

 * @author Manos Karvounis

 */

public class XMLTextValidationObject implements TextValidationObject {

	private transient Logger log = Logger.getLogger(XMLTextValidationObject.class);

	private String id = "";

	private String status;

	private final Document doc;

	private XPathFactory factory = XPathFactory.newInstance();

	public XMLTextValidationObject(Document doc) {

		super();

		this.doc = doc;

	}

	@Override

	public String getId() {

		return this.id;

	}

	@Override

	public void setId(String id) {

		this.id = id;

	}

	public String getStatus() {

		return status;

	}

	public void setStatus(String status) {

		this.status = status;

	}

	@Override

	public Object getContentAsObject() {

		return this.doc;

	}

	@Override

	public String getContentAsText() {

		StringWriter sw = new StringWriter();

	    Transformer transformer = null;

		try {

			transformer = TransformerFactory.newInstance().newTransformer();

		    Source source = new DOMSource(doc);

		    Result output = new StreamResult(sw);

			transformer.transform(source, output);

		} catch (TransformerConfigurationException e) {

			log.error("", e);

		} catch (TransformerFactoryConfigurationError e) {

			log.error("", e);

		} catch (TransformerException e) {

			log.error("", e);

		}

	    return sw.toString();

	}

	public Document getDocument() {

		return this.doc;

	}

	/**

	 * Get the nodes retrieved by issuing the given XPATH query.

	 * @param xpath

	 * @return

	 * @throws DataException

	 */

	public NodeList getNodes(String xpath) throws DataException {

		log.debug("xpath: "+xpath);

		try {

			XPath xxpath = factory.newXPath();

			XPathExpression expr = xxpath.compile(xpath);

			return (NodeList) expr.evaluate(doc, XPathConstants.NODESET);

		} catch (XPathExpressionException e) {

			throw new DataException();

		}

	}

}