package org.opentrafficsim.road.gtu.lane.tactical.following;
   
   import org.opentrafficsim.base.parameters.ParameterException;
   import org.opentrafficsim.base.parameters.ParameterSet;
   import org.opentrafficsim.base.parameters.Parameters;
   
   import nl.tudelft.simulation.jstats.distributions.DistContinuous;
   import nl.tudelft.simulation.jstats.distributions.DistNormal;
   import nl.tudelft.simulation.jstats.streams.StreamInterface;
  
  /**
   * Factory for IDM types.
   * <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/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version 15 jan. 2018 <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>
   * @param <T> IDM class
   */
  public class AbstractIDMFactory<T extends AbstractIDM> implements CarFollowingModelFactory<T>
  {
  
      /** Single instance as it is state-less. */
      private final T idm;
  
      /** Distribution for fSpeed parameter. */
      private final DistContinuous fSpeed;
  
      /**
       * Sets the idm model, which should be state-less.
       * @param idm T; idm model, which should be state-less
       * @param randomStream StreamInterface; random number stream
       */
      public AbstractIDMFactory(final T idm, final StreamInterface randomStream)
      {
          this.idm = idm;
          this.fSpeed = new DistNormal(randomStream, 123.7 / 120.0, 0.1);
      }
  
      /** {@inheritDoc} */
      @Override
      public final T generateCarFollowingModel()
      {
          return this.idm;
      }
  
      /** {@inheritDoc} */
      @Override
      public Parameters getParameters() throws ParameterException
      {
          ParameterSet parameters = new ParameterSet();
          parameters.setDefaultParameters(AbstractIDM.class);
          parameters.setParameter(AbstractIDM.FSPEED, this.fSpeed.draw());
          return parameters;
      }
  
  }