CrossSectionLink

package org.opentrafficsim.road.network.lane;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.djutils.exceptions.Throw;
import org.opentrafficsim.core.dsol.OTSSimulatorInterface;
import org.opentrafficsim.core.geometry.OTSLine3D;
import org.opentrafficsim.core.network.LinkType;
import org.opentrafficsim.core.network.Network;
import org.opentrafficsim.core.network.NetworkException;
import org.opentrafficsim.core.network.Node;
import org.opentrafficsim.core.network.OTSLink;
import org.opentrafficsim.road.network.lane.changing.LaneKeepingPolicy;

import nl.tudelft.simulation.event.EventType;

/**
 * A CrossSectionLink is a link with lanes where GTUs can possibly switch between lanes.
 * <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/docs/license.html">OpenTrafficSim License</a>.
 * <p>
 * $LastChangedDate: 2015-09-16 19:20:07 +0200 (Wed, 16 Sep 2015) $, @version $Revision: 1405 $, by $Author: averbraeck $,
 * initial version Aug 19, 2014 <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.citg.tudelft.nl">Guus Tamminga</a>
 */
public class CrossSectionLink extends OTSLink implements Serializable
{
    /** */
    private static final long serialVersionUID = 20141015L;

    /** List of cross-section elements. */
    private final List<CrossSectionElement> crossSectionElementList = new ArrayList<>();

    /** List of lanes. */
    private final List<Lane> lanes = new ArrayList<>();

    /** The policy to generally keep left, keep right, or keep lane. */
    private final LaneKeepingPolicy laneKeepingPolicy;

    /** Priority. */
    // TODO per GTUDirectionality / LongitudinalDirectionality?
    private Priority priority = Priority.NONE;

    /** Fraction in range 0...1 to divide origin or destination flow over connectors. */
    private Double demandWeight = null;

    /**
     * The (regular, not timed) event type for pub/sub indicating the addition of a Lane to a CrossSectionLink. <br>
     * Payload: Object[] { String networkId, String linkId, String LaneId, Lane lane, int laneNumber } <br>
     * TODO work in a different way with lane numbers to align to standard lane numbering.
     */
    public static final EventType LANE_ADD_EVENT = new EventType("LINK.LANE.ADD");

    /**
     * The (regular, not timed) event type for pub/sub indicating the removal of a Lane from a CrossSectionLink. <br>
     * Payload: Object[] { String networkId, String linkId, String LaneId } <br>
     * TODO allow for the removal of a Lane; currently this is not possible.
     */
    public static final EventType LANE_REMOVE_EVENT = new EventType("LINK.LANE.REMOVE");

    /**
     * Construction of a cross section link.
     * @param network Network; the network
     * @param id String; the link id.
     * @param startNode Node; the start node (directional).
     * @param endNode Node; the end node (directional).
     * @param linkType LinkType; the link type
     * @param designLine OTSLine3D; the design line of the Link
     * @param simulator OTSSimulatorInterface; the simulator on which events can be scheduled
     * @param laneKeepingPolicy LaneKeepingPolicy; the policy to generally keep left, keep right, or keep lane
     * @throws NetworkException if link already exists in the network, if name of the link is not unique, or if the start node
     *             or the end node of the link are not registered in the network.
     */
    @SuppressWarnings("checkstyle:parameternumber")
    public CrossSectionLink(final Network network, final String id, final Node startNode, final Node endNode,
            final LinkType linkType, final OTSLine3D designLine, final OTSSimulatorInterface simulator,
            final LaneKeepingPolicy laneKeepingPolicy) throws NetworkException
    {
        super(network, id, startNode, endNode, linkType, designLine, simulator);
        this.laneKeepingPolicy = laneKeepingPolicy;
    }

    /**
     * Clone a CrossSectionLink for a new network.
     * @param newNetwork Network; the new network to which the clone belongs
     * @param newSimulator OTSSimulatorInterface; the new simulator for this network
     * @param link CrossSectionLink; the link to clone from
     * @throws NetworkException if link already exists in the network, if name of the link is not unique, or if the start node
     *             or the end node of the link are not registered in the network.
     */
    protected CrossSectionLink(final Network newNetwork, final OTSSimulatorInterface newSimulator, final CrossSectionLink link)
            throws NetworkException
    {
        super(newNetwork, newSimulator, link);
        this.laneKeepingPolicy = link.laneKeepingPolicy;
        for (CrossSectionElement cse : link.crossSectionElementList)
        {
            cse.clone(this, newSimulator);
            // the CrossSectionElement will add itself to the Link (OTS-237)
        }
    }

    /**
     * Add a cross section element at the end of the list. <br>
     * <b>Note:</b> LEFT is seen as a positive lateral direction, RIGHT as a negative lateral direction.
     * @param cse CrossSectionElement; the cross section element to add.
     */
    protected final void addCrossSectionElement(final CrossSectionElement cse)
    {
        this.crossSectionElementList.add(cse);
        if (cse instanceof Lane)
        {
            this.lanes.add((Lane) cse);
            fireEvent(LANE_ADD_EVENT,
                    new Object[] {getNetwork().getId(), getId(), cse.getId(), (Lane) cse, this.lanes.indexOf(cse)});
        }
    }

    /**
     * Retrieve a safe copy of the cross section element list.
     * @return List&lt;CrossSectionElement&gt;; the cross section element list.
     */
    public final List<CrossSectionElement> getCrossSectionElementList()
    {
        return this.crossSectionElementList == null ? new ArrayList<>() : new ArrayList<>(this.crossSectionElementList);
    }

    /**
     * Retrieve the lane keeping policy.
     * @return LaneKeepingPolicy; the lane keeping policy on this CrossSectionLink
     */
    public final LaneKeepingPolicy getLaneKeepingPolicy()
    {
        return this.laneKeepingPolicy;
    }

    /**
     * Find a cross section element with a specified id.
     * @param id String; the id to search for
     * @return CrossSectionElement; the cross section element with the given id, or null if not found
     */
    public final CrossSectionElement getCrossSectionElement(final String id)
    {
        for (CrossSectionElement cse : this.crossSectionElementList)
        {
            if (cse.getId().equals(id))
            {
                return cse;
            }
        }
        return null;
    }

    /**
     * Return a safe copy of the list of lanes of this CrossSectionLink.
     * @return List&lt;Lane&gt;; the list of lanes.
     */
    public final List<Lane> getLanes()
    {
        return this.lanes == null ? new ArrayList<>() : new ArrayList<>(this.lanes);
    }

    /**
     * @return priority.
     */
    public final Priority getPriority()
    {
        return this.priority;
    }

    /**
     * @param priority Priority; set priority.
     */
    public final void setPriority(final Priority priority)
    {
        this.priority = priority;
    }

    /**
     * Sets the demand weight. This is only applicable to links of type CONNECTOR.
     * @param demandWeight double; demand weight, which is any positive value
     */
    public final void setDemandWeight(final double demandWeight)
    {
        Throw.when(demandWeight < 0.0, IllegalArgumentException.class, "Demand weight should be positive.");
        Throw.when(!getLinkType().isConnector(), IllegalArgumentException.class,
                "Demand weight can only be set on connectors.");
        this.demandWeight = demandWeight;
    }

    /**
     * Clears the demand weight. This is only applicable to links of type CONNECTOR.
     */
    public final void clearDemandWeight()
    {
        this.demandWeight = null;
    }

    /**
     * Returns the demand weight. This is only applicable to links of type CONNECTOR.
     * @return Double; demand weight, any positive value, or {@code null}
     */
    public final Double getDemandWeight()
    {
        return this.demandWeight;
    }

    /** {@inheritDoc} */
    @Override
    public final String toString()
    {
        return "CrossSectionLink [name=" + this.getId() + ", nodes=" + getStartNode().getId() + "-" + getEndNode().getId()
                + ", crossSectionElementList=" + this.crossSectionElementList + ", lanes=" + this.lanes + ", laneKeepingPolicy="
                + this.laneKeepingPolicy + "]";
    }

    /** {@inheritDoc} */
    @Override
    @SuppressWarnings("checkstyle:designforextension")
    public CrossSectionLink clone(final Network newNetwork, final OTSSimulatorInterface newSimulator) throws NetworkException
    {
        return new CrossSectionLink(newNetwork, newSimulator, this);
    }

    /**
     * Priority of a link.
     * <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 12 dec. 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 enum Priority
    {
        /** Traffic has priority. */
        PRIORITY,

        /** No priority. */
        NONE,

        /** Turn on red. */
        TURN_ON_RED,

        /** Yield. */
        YIELD,

        /** Need to stop. */
        STOP,

        /** Priority according to all-stop rules. */
        ALL_STOP,

        /** Priority at bus stop, i.e. bus has right of way if it wants to leave the bus stop. */
        BUS_STOP;

        /**
         * Returns whether this is priority.
         * @return whether this is priority
         */
        public boolean isPriority()
        {
            return this.equals(PRIORITY);
        }

        /**
         * Returns whether this is none.
         * @return whether this is none
         */
        public boolean isNone()
        {
            return this.equals(NONE);
        }

        /**
         * Returns whether this is turn on red.
         * @return whether this is turn on red
         */
        public boolean isTurnOnRed()
        {
            return this.equals(TURN_ON_RED);
        }

        /**
         * Returns whether this is yield.
         * @return whether this is yield
         */
        public boolean isYield()
        {
            return this.equals(YIELD);
        }

        /**
         * Returns whether this is stop.
         * @return whether this is stop
         */
        public boolean isStop()
        {
            return this.equals(STOP);
        }

        /**
         * Returns whether this is all-stop.
         * @return whether this is all-stop
         */
        public boolean isAllStop()
        {
            return this.equals(ALL_STOP);
        }

        /**
         * Returns whether this is bus stop.
         * @return whether this is bus stop
         */
        public boolean isBusStop()
        {
            return this.equals(BUS_STOP);
        }

    }

}