AccelerationLaneChangers.java

package org.opentrafficsim.road.gtu.tactical.lmrs;

import org.djunits.value.vdouble.scalar.Acceleration;
import org.djunits.value.vdouble.scalar.Length;
import org.opentrafficsim.base.parameters.ParameterException;
import org.opentrafficsim.core.gtu.GtuException;
import org.opentrafficsim.core.gtu.Stateless;
import org.opentrafficsim.core.network.LateralDirectionality;
import org.opentrafficsim.road.gtu.perception.RelativeLane;
import org.opentrafficsim.road.gtu.perception.categories.neighbors.NeighborsPerception;
import org.opentrafficsim.road.gtu.perception.object.PerceivedGtu;
import org.opentrafficsim.road.gtu.tactical.TacticalContextEgo;
import org.opentrafficsim.road.gtu.tactical.util.CarFollowingUtil;

/**
 * Accelerate to follow lane-changing leaders from adjacent lanes towards the current lane. This is only relevant when
 * {@code LaneBookkeeping.EDGE} is used.
 * <p>
 * Copyright (c) 2026-2026 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 Wouter Schakel
 */
public final class AccelerationLaneChangers implements AccelerationIncentive, Stateless<AccelerationLaneChangers>
{

    /** Singleton instance. */
    public static final AccelerationLaneChangers SINGLETON = new AccelerationLaneChangers();

    /**
     * Constructor.
     */
    private AccelerationLaneChangers()
    {
        //
    }

    @Override
    public Acceleration accelerate(final TacticalContextEgo context, final RelativeLane lane, final Length mergeDistance)
            throws ParameterException, GtuException
    {
        Acceleration a = NO_REASON;
        for (LateralDirectionality lat : LateralDirectionality.LEFT_AND_RIGHT)
        {
            LateralDirectionality flip = lat.flip();
            for (PerceivedGtu leader : context.getPerception().getPerceptionCategory(NeighborsPerception.class)
                    .getLeaders(new RelativeLane(lat, 1)))
            {
                if (leader.getManeuver().isChangingLane(flip))
                {
                    a = Acceleration.min(a, CarFollowingUtil.followSingleLeader(context, leader));
                    break;
                }
            }
        }
        return a;
    }

    @Override
    public AccelerationLaneChangers get()
    {
        return SINGLETON;
    }

}