org.entur.netex.validation.xml.PublicationDeliveryVersionAttributeReader Maven / Gradle / Ivy

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Library for validating NeTEx datasets against the Nordic NeTEx Profile.

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package org.entur.netex.validation.xml;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Read the NeTEx version stored in the version attribute of the PublicationDelivery element.
 */
public final class PublicationDeliveryVersionAttributeReader {

  private static final Logger LOGGER = LoggerFactory.getLogger(
    PublicationDeliveryVersionAttributeReader.class
  );

  private PublicationDeliveryVersionAttributeReader() {}

  public static String findPublicationDeliveryVersion(byte[] content) {
    String versionAttribute = null;
    try {
      XMLInputFactory inputFactory = NetexXMLParser.getSecureXmlInputFactory();
      InputStream in = new ByteArrayInputStream(content);
      XMLEventReader eventReader = inputFactory.createXMLEventReader(
        new BufferedInputStream(in)
      );
      while (versionAttribute == null && eventReader.hasNext()) {
        XMLEvent event = eventReader.nextEvent();

        if (event.isStartElement()) {
          StartElement startElement = event.asStartElement();

          if (
            "PublicationDelivery".equals(startElement.getName().getLocalPart())
          ) {
            Iterator attributes = event
              .asStartElement()
              .getAttributes();
            while (attributes.hasNext()) {
              Attribute attribute = attributes.next();
              if ("version".equals(attribute.getName().toString())) {
                versionAttribute = attribute.getValue();
              }
            }
          }
        }
      }
      eventReader.close();
      in.close();
    } catch (XMLStreamException e) {
      LOGGER.error("Malformed xml", e);
    } catch (IOException e) {
      LOGGER.error("Error closing file", e);
    }

    return versionAttribute;
  }
}