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.w3c.dom.NamedNodeMap;
   import org.w3c.dom.Node;
   import org.w3c.dom.NodeList;
  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 SpiralTag implements Serializable
  {
      /** */
      private static final long serialVersionUID = 20150723L;
  
      /** Degree of the curve at the start(s-coordinate?). */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length curvStart = null;
  
      /** Degree of the curve at the end(s-coordinate?). */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      Length curvEnd = null;
  
      /**
       * Parse the attributes of the road.type tag. The sub-elements are parsed in separate classes.
       * @param nodeList NodeList; the list of subnodes of the road node
       * @param parser OpenDriveNetworkLaneParser; the parser with the lists of information
       * @param geometryTag GeometryTag; the GeometryTag to which this element belongs
       * @throws SAXException when parsing of the tag fails
       */
      @SuppressWarnings("checkstyle:needbraces")
      static void parseSpiral(final NodeList nodeList, final OpenDriveNetworkLaneParser parser, final GeometryTag geometryTag)
              throws SAXException
      {
          int typeCount = 0;
          for (Node node : XMLParser.getNodes(nodeList, "spiral"))
          {
              typeCount++;
  
              SpiralTag spiralTag = new SpiralTag();
              NamedNodeMap attributes = node.getAttributes();
  
              Node curvStart = attributes.getNamedItem("curvStart");
              if (curvStart != null)
                  spiralTag.curvStart = new Length(Double.parseDouble(curvStart.getNodeValue().trim()), LengthUnit.SI);
  
              Node curvEnd = attributes.getNamedItem("curvEnd");
              if (curvEnd != null)
                  spiralTag.curvEnd = new Length(Double.parseDouble(curvEnd.getNodeValue().trim()), LengthUnit.SI);
  
              geometryTag.spiralTag = spiralTag;
          }
  
          if (typeCount > 1)
              throw new SAXException("ROAD: more than one spiral tag!");
      }
  
      /** {@inheritDoc} */
      @Override
      public final String toString()
      {
          return "SpiralTag [curvStart=" + this.curvStart + ", curvEnd=" + this.curvEnd + "]";
      }
  }