package org.opentrafficsim.kpi.sampling.indicator;
   
   import java.util.List;
   
   import org.djunits.unit.DimensionlessUnit;
   import org.djunits.value.vdouble.scalar.Dimensionless;
   import org.djunits.value.vdouble.scalar.Time;
   import org.opentrafficsim.kpi.interfaces.GtuDataInterface;
   import org.opentrafficsim.kpi.sampling.Query;
  import org.opentrafficsim.kpi.sampling.Trajectory;
  import org.opentrafficsim.kpi.sampling.TrajectoryGroup;
  
  /**
   * Sum of measurements with zero speed, preceded by a non-zero speed.
   * <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 1 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 TotalNumberOfStops extends AbstractIndicator<Dimensionless>
  {
  
      /** {@inheritDoc} */
      @Override
      protected <G extends GtuDataInterface> Dimensionless calculate(final Query<G> query, final Time startTime,
              final Time endTime, final List<TrajectoryGroup<G>> trajectoryGroups)
      {
          int sum = 0;
          for (TrajectoryGroup<?> trajectoryGroup : trajectoryGroups)
          {
              for (Trajectory<?> trajectory : trajectoryGroup.getTrajectories())
              {
                  float[] v = trajectory.getV();
                  for (int i = 1; i < v.length; i++)
                  {
                      if (v[i] == 0 && v[i - 1] > 0)
                      {
                          sum++;
                      }
                  }
              }
          }
          return new Dimensionless(sum, DimensionlessUnit.SI);
      }
  
      /** {@inheritDoc} */
      @Override
      @SuppressWarnings("checkstyle:designforextension")
      public String toString()
      {
          return "TotalNumberOfStops []";
      }
  
  }