package org.opentrafficsim.road.gtu.lane.tactical.following;
   
   import java.io.Serializable;
   
   import org.djunits.unit.AccelerationUnit;
   import org.djunits.value.vdouble.scalar.Acceleration;
   import org.djunits.value.vdouble.scalar.Duration;
   import org.djunits.value.vdouble.scalar.Length;
   import org.djunits.value.vdouble.scalar.Speed;
  import org.opentrafficsim.base.parameters.ParameterException;
  import org.opentrafficsim.base.parameters.Parameters;
  import org.opentrafficsim.road.gtu.lane.perception.PerceptionIterable;
  import org.opentrafficsim.road.gtu.lane.perception.headway.Headway;
  import org.opentrafficsim.road.network.speed.SpeedLimitInfo;
  
  /**
   * Fixed GTU following model. This GTU following model does not react in any way to other GTUs. Instead it has a predetermined
   * acceleration for a predetermined duration.<br>
   * Primary use is testing of lane based GTU movement.
   * <p>
   * Copyright (c) 2013-2018 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>
   * @version $Revision: 1378 $, $LastChangedDate: 2015-09-03 13:38:01 +0200 (Thu, 03 Sep 2015) $, by $Author: averbraeck $,
   *          initial version 6 feb. 2015 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   */
  public class FixedAccelerationModel extends AbstractGTUFollowingModelMobil implements Serializable
  {
      /** */
      private static final long serialVersionUID = 20150206L;
  
      /** Acceleration that will be returned in GTUFollowingModelResult by computeAcceleration. */
      private Acceleration acceleration;
  
      /** Valid until time that will be returned in GTUFollowingModelResult by computeAcceleration. */
      private Duration duration;
  
      /**
       * Create a new FixedAccelerationModel.
       * @param acceleration Acceleration; the acceleration that will be returned by the computeAcceleration methods
       * @param duration Duration; the duration that the acceleration will be maintained
       */
      public FixedAccelerationModel(final Acceleration acceleration, final Duration duration)
      {
          this.acceleration = acceleration;
          this.duration = duration;
      }
  
      /**
       * Retrieve the duration of this FixedAccelerationModel.
       * @return Duration; the duration of this FixedAccelerationModel
       */
      public final Duration getDuration()
      {
          return this.duration;
      }
  
      /**
       * Retrieve the acceleration of this FixedAccelerationModel.
       * @return Acceleration; the acceleration of this FixedAccelerationModel
       */
      public final Acceleration getAcceleration()
      {
          return this.acceleration;
      }
  
      /** {@inheritDoc} */
      @Override
      public final Acceleration computeAcceleration(final Speed followerSpeed, final Speed followerMaximumSpeed,
              final Speed leaderSpeed, final Length headway, final Speed speedLimit, final Duration stepSize)
      {
          return this.acceleration;
      }
  
      /** {@inheritDoc} */
      @Override
      public final Acceleration computeAcceleration(final Speed followerSpeed, final Speed followerMaximumSpeed,
              final Speed leaderSpeed, final Length headway, final Speed speedLimit)
      {
          return this.acceleration;
      }
  
      /** {@inheritDoc} */
      @Override
      public final Acceleration getMaximumSafeDeceleration()
      {
          // TODO should be specified in constructor
          return new Acceleration(2, AccelerationUnit.METER_PER_SECOND_2);
      }
  
      /** {@inheritDoc} */
      @Override
      public final Duration getStepSize()
      {
          return this.duration;
      }
  
     /** {@inheritDoc} */
     @Override
     public final String getName()
     {
         return "Fixed";
     }
 
     /** {@inheritDoc} */
     @Override
     public final String getLongName()
     {
         return "Fixed GTU following model";
     }
 
     /** {@inheritDoc} */
     @Override
     public final String toString()
     {
         return "FixedAccelerationModel " + this.duration + ", " + this.acceleration;
     }
 
     /** {@inheritDoc} */
     @Override
     public final void setA(final Acceleration a)
     {
         //
     }
 
     /** {@inheritDoc} */
     @Override
     public final void setT(final Duration t)
     {
         //
     }
 
     /** {@inheritDoc} */
     @Override
     public final void setFspeed(final double fSpeed)
     {
         //
     }
 
     // The following is inherited from CarFollowingModel
 
     /** {@inheritDoc} */
     @Override
     public final Speed desiredSpeed(final Parameters parameters, final SpeedLimitInfo speedInfo) throws ParameterException
     {
         return null;
     }
 
     /** {@inheritDoc} */
     @Override
     public final Length desiredHeadway(final Parameters parameters, final Speed speed) throws ParameterException
     {
         return null;
     }
 
     /** {@inheritDoc} */
     @Override
     public final Acceleration followingAcceleration(final Parameters parameters, final Speed speed,
             final SpeedLimitInfo speedInfo, final PerceptionIterable<? extends Headway> leaders) throws ParameterException
     {
         return null;
     }
 
 }