URLNotificationXMLConverter.java

package gov.usgs.earthquake.distribution;

import gov.usgs.util.XmlUtils;

import java.io.InputStream;

/** Converts to and from XML for URL notifications */
public class URLNotificationXMLConverter {

  /** Namespace for product XML */
  public static final String PRODUCT_XML_NAMESPACE = "http://earthquake.usgs.gov/distribution/product";

  /** static var for notification element */
  public static final String NOTIFICATION_ELEMENT = "notification";
  /** attribute for product id */
  public static final String ATTRIBUTE_PRODUCT_ID = "id";
  /** attribute for updated */
  public static final String ATTRIBUTE_PRODUCT_UPDATED = "updated";
  /** attribute for expires */
  public static final String ATTRIBUTE_EXPIRES = "expires";
  /** attribute for url */
  public static final String ATTRIBUTE_URL = "url";

  /**
   * Converts a URLNotification to XML
   *
   * @param notification The URLNotification to be converted
   * @return an XML-formatted string
   */
  public static String toXML(final URLNotification notification) {
    StringBuffer buf = new StringBuffer();

    buf.append("<?xml version=\"1.0\"?>\n");
    // start element
    buf.append("<").append(NOTIFICATION_ELEMENT);
    buf.append(" xmlns=\"").append(PRODUCT_XML_NAMESPACE).append("\"");

    // add attributes
    buf.append(" ").append(ATTRIBUTE_PRODUCT_ID).append("=\"").append(notification.getProductId().toString())
        .append("\"");
    buf.append(" ").append(ATTRIBUTE_PRODUCT_UPDATED).append("=\"")
        .append(XmlUtils.formatDate(notification.getProductId().getUpdateTime())).append("\"");
    buf.append(" ").append(ATTRIBUTE_EXPIRES).append("=\"")
        .append(XmlUtils.formatDate(notification.getExpirationDate())).append("\"");
    buf.append(" ").append(ATTRIBUTE_URL).append("=\"").append(notification.getProductURL().toString()).append("\"");

    // end element
    buf.append("/>");

    return buf.toString();
  }

  /**
   * Parses an XML message into a URLNotification
   *
   * @param message The convertee
   *
   * @return A parsed URL notification
   * @throws Exception If parse goes wrong
   */
  public static URLNotification parseXML(final InputStream message) throws Exception {
    URLNotificationParser parser = new URLNotificationParser();
    parser.parse(message);
    return parser.getNotification();
  }

}