package org.opentrafficsim.road.network.factory.opendrive;
   
   import java.io.Serializable;
   
   import org.djunits.unit.LengthUnit;
   import org.djunits.value.vdouble.scalar.Length;
   import org.opentrafficsim.core.network.NetworkException;
   import org.w3c.dom.NamedNodeMap;
   import org.w3c.dom.Node;
  import org.xml.sax.SAXException;
  
  /**
   * <p>
   * Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * <p>
   * $LastChangedDate: 2015-07-24 02:58:59 +0200 (Fri, 24 Jul 2015) $, @version $Revision: 1147 $, by $Author: averbraeck $,
   * initial version Jul 23, 2015 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   */
  class ElevationTag implements Serializable
  {
      /** */
      private static final long serialVersionUID = 20150723L;
  
      /** Start position (s-coordinate). */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length s = null;
  
      /** The a coefficient. */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length a = null;
  
      /** The b coefficient. */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length b = null;
  
      /** The c coefficient. */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length c = null;
  
      /** The d coefficient. */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length d = null;
  
      /** Elevation = a + b*ds + c*ds2 + d*ds3 */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length elevation = null;
  
      /**
       * Parse the attributes of the road tag. The sub-elements are parsed in separate classes.
       * @param node Node; the top-level road node
       * @param parser OpenDriveNetworkLaneParser; the parser with the lists of information
       * @return the generated RoadTag for further reference
       * @throws SAXException when parsing of the tag fails
       * @throws NetworkException when parsing of the tag fails
       */
      @SuppressWarnings("checkstyle:needbraces")
      static ElevationTag parseElevation(final Node node, final OpenDriveNetworkLaneParser parser)
              throws SAXException, NetworkException
      {
          NamedNodeMap attributes = node.getAttributes();
          ElevationTag elevationTag = new ElevationTag();
  
          Node s = attributes.getNamedItem("s");
          if (s == null)
              throw new SAXException("Geometry: missing attribute s");
          elevationTag.s = new Length(Double.parseDouble(s.getNodeValue().trim()), LengthUnit.METER);
  
          Node a = attributes.getNamedItem("a");
          if (a == null)
              throw new SAXException("Geometry: missing attribute a");
          elevationTag.a = new Length(Double.parseDouble(a.getNodeValue().trim()), LengthUnit.METER);
  
          Node b = attributes.getNamedItem("b");
          if (b == null)
              throw new SAXException("Geometry: missing attribute b");
          elevationTag.b = new Length(Double.parseDouble(b.getNodeValue().trim()), LengthUnit.METER);
  
          Node c = attributes.getNamedItem("c");
          if (c == null)
              throw new SAXException("Geometry: missing attribute c");
          elevationTag.c = new Length(Double.parseDouble(c.getNodeValue().trim()), LengthUnit.METER);
  
          Node d = attributes.getNamedItem("d");
          if (d == null)
              throw new SAXException("Geometry: missing attribute d");
          elevationTag.d = new Length(Double.parseDouble(d.getNodeValue().trim()), LengthUnit.METER);
  
          elevationTag.elevation = new Length(elevationTag.a.plus(elevationTag.b.multiplyBy(elevationTag.s.doubleValue()))
                  .plus(elevationTag.c.multiplyBy(Math.pow(elevationTag.s.doubleValue(), 2)))
                  .plus(elevationTag.d.multiplyBy(Math.pow(elevationTag.s.doubleValue(), 3))));
  
          return elevationTag;
      }
  
      /** {@inheritDoc} */
      @Override
      public final String toString()
     {
         return "ElevationTag [s=" + this.s + ", a=" + this.a + ", b=" + this.b + ", c=" + this.c + ", d=" + this.d
                 + ", elevation=" + this.elevation + "]";
     }
 }