package org.opentrafficsim.road.network.sampling;
   
   import org.djunits.unit.SpeedUnit;
   import org.djunits.value.vdouble.scalar.Speed;
   import org.opentrafficsim.core.gtu.GTUException;
   import org.opentrafficsim.core.network.NetworkException;
   import org.opentrafficsim.kpi.interfaces.GtuDataInterface;
   import org.opentrafficsim.kpi.sampling.data.ExtendedDataType;
   import org.opentrafficsim.road.gtu.lane.LaneBasedGTU;
  
  import nl.tudelft.simulation.language.Throw;
  
  /**
   * <p>
   * Copyright (c) 2013-2016 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/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version 11 okt. 2016 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   */
  public class SpeedLimit extends ExtendedDataType<Speed>
  {
  
      /**
       * Constructor.
       */
      public SpeedLimit()
      {
          super("SpeedLimit");
      }
  
      /** {@inheritDoc} */
      @Override
      public final Speed getValue(final GtuDataInterface gtu)
      {
          Throw.whenNull(gtu, "GTU may not be null.");
          Throw.when(!(gtu instanceof GtuData), IllegalArgumentException.class,
                  "Extended data type speed limit is only for use with GtuData. The provided data %s is of the wrong type.", gtu);
          LaneBasedGTU laneGtu = ((GtuData) gtu).getGtu();
          try
          {
              return laneGtu.getReferencePosition().getLane().getSpeedLimit(laneGtu.getGTUType());
          }
          catch (NetworkException | GTUException exception)
          {
              throw new RuntimeException("Could not obtain speed limit.", exception);
          }
      }
  
      /** {@inheritDoc} */
      public final String toString()
      {
          return "SpeedLimit";
      }
  
  }