package org.opentrafficsim.core.network.factory.xml.units;
   
   import java.util.HashMap;
   import java.util.Map;
   
   import org.djunits.unit.SpeedUnit;
   import org.djunits.unit.UNITS;
   import org.djunits.value.vdouble.scalar.Speed;
   import org.opentrafficsim.core.network.NetworkException;
  
  /**
   * Parser for speed with unit.
   * <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>
   */
  public final class SpeedUnits implements UNITS
  {
      /** The speed units. */
      public static final Map<String, SpeedUnit> SPEED_UNITS = new HashMap<>();
      static
      {
          SPEED_UNITS.put("km/h", KM_PER_HOUR);
          SPEED_UNITS.put("mi/h", MILE_PER_HOUR);
          SPEED_UNITS.put("m/s", METER_PER_SECOND);
          SPEED_UNITS.put("ft/s", FOOT_PER_SECOND);
      }
  
      /** Utility class. */
      private SpeedUnits()
      {
          // do not instantiate
      }
  
      /**
       * @param s String; the string to parse
       * @return the unit as a String in the Map.
       * @throws NetworkException when parsing fails
       */
      public static String parseSpeedUnit(final String s) throws NetworkException
      {
          String u = null;
          for (String us : SPEED_UNITS.keySet())
          {
              if (s.toString().contains(us))
              {
                  if (u == null || us.length() > u.length())
                  {
                      u = us;
                  }
              }
          }
          if (u == null)
          {
              throw new NetworkException("Parsing network: cannot instantiate speed unit in: " + s);
          }
          return u;
      }
  
      /**
       * @param s String; the string to parse
       * @return the next value.
       * @throws NetworkException when parsing fails
       */
      public static Speed parseSpeed(final String s) throws NetworkException
      {
          String us = parseSpeedUnit(s);
          SpeedUnit u = SPEED_UNITS.get(us);
          String sv = s.substring(0, s.indexOf(us));
          try
          {
              double value = Double.parseDouble(sv);
              return new Speed(value, u);
          }
          catch (NumberFormatException nfe)
          {
              throw new NetworkException("Parsing network: cannot instantiate scalar: " + s, nfe);
          }
      }
  }