package org.opentrafficsim.road.gtu.lane;
   
   import org.djutils.event.Event;
   import org.djutils.event.EventListener;
   import org.opentrafficsim.base.OtsRuntimeException;
   import org.opentrafficsim.core.network.Network;
   
   /**
    * Abstract class that listens to move events of GTUs so checks can be performed.
   * <p>
   * Copyright (c) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://github.com/peter-knoppers">Peter Knoppers</a>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   */
  public abstract class AbstractLaneBasedMoveChecker implements EventListener
  {
      /** Network. */
      private final Network network;
  
      /**
       * Constructor.
       * @param network network
       */
      public AbstractLaneBasedMoveChecker(final Network network)
      {
          network.addListener(this, Network.GTU_ADD_EVENT);
          network.addListener(this, Network.GTU_REMOVE_EVENT);
          this.network = network;
      }
  
      @Override
      public void notify(final Event event)
      {
          if (event.getType().equals(LaneBasedGtu.LANEBASED_MOVE_EVENT))
          {
              try
              {
                  Object[] payload = (Object[]) event.getContent();
                  checkMove((LaneBasedGtu) this.network.getGTU((String) payload[0])
                          .orElseThrow(() -> new OtsRuntimeException("Check move event on GTU not in the network.")));
              }
              catch (OtsRuntimeException ex)
              {
                  throw ex;
              }
              catch (Exception ex)
              {
                  throw new OtsRuntimeException(ex);
              }
          }
          else if (event.getType().equals(Network.GTU_ADD_EVENT))
          {
              this.network.getGTU((String) event.getContent()).get().addListener(this, LaneBasedGtu.LANEBASED_MOVE_EVENT);
          }
          else if (event.getType().equals(Network.GTU_REMOVE_EVENT))
          {
              this.network.getGTU((String) event.getContent()).get().removeListener(this, LaneBasedGtu.LANEBASED_MOVE_EVENT);
          }
          else
          {
              throw new OtsRuntimeException("AbstractMoveChecker is a listener to an unknown event type.");
          }
      }
  
      /**
       * Check the move of the given GTU.
       * @param gtu GTU.
       * @throws Exception thrown when something is not all right
       */
      public abstract void checkMove(LaneBasedGtu gtu) throws Exception;
  
  }