LateralDirectionality.java

package org.opentrafficsim.core.network;

/**
 * Directionality in lateral direction. LEFT is the direction to the left of the longitudinal orientation of the GTU, relative
 * to the forward driving direction. RIGHT is the direction to the right of the longitudinal orientation of the GTU, relative to
 * the forward driving direction.
 * <p>
 * Copyright (c) 2013-2018 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: 2018-09-19 13:55:45 +0200 (Wed, 19 Sep 2018) $, @version $Revision: 4006 $, by $Author: averbraeck $,
 * initial version Oct 15, 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>
 */
public enum LateralDirectionality
{
    /** Direction to the left of the longitudinal orientation of the GTU, relative to the forward driving direction. */
    LEFT,
    /** Direction to the right of the longitudinal orientation of the GTU, relative to the forward driving direction. */
    RIGHT,
    /** Absence of a lateral direction. */
    NONE;

    /**
     * Determine whether the direction is the left direction.
     * @return whether the direction is the left direction
     */
    public boolean isLeft()
    {
        return this.equals(LEFT);
    }

    /**
     * Determine whether the direction is the right direction.
     * @return whether the direction is the right direction
     */
    public boolean isRight()
    {
        return this.equals(RIGHT);
    }

    /**
     * Determine whether the lateral direction is not present.
     * @return whether the lateral direction is not present
     */
    public boolean isNone()
    {
        return this.equals(NONE);
    }

    /**
     * Returns the other direction.
     * @return other direction
     */
    public LateralDirectionality flip()
    {
        return this.equals(NONE) ? NONE : this.equals(LEFT) ? RIGHT : LEFT;
    }

}