source: tmcsimulator/trunk/src/atmsdriver/model/Station.java @ 184

package atmsdriver.model;



import atmsdriver.model.LoopDetector.DOTCOLOR;

import java.util.List;

import org.w3c.dom.Document;

import org.w3c.dom.Element;



/**

 * A Station (LDS or Loop Detector Station) represents a group of lane detectors

 * across all lanes at a particular point on a highway.  A station is

 * identified by its highway number and postmile.  A station has an associated

 * direction used to establish which direction is Main and which is Opposite.

 * The MLTotVol and OppTotVol for a station can be dynamically updated.

 * A station has other attributes: lineNum, ldsID, drop, and location which are

 * used by the FEP.  A station can be compared to other stations by its postmile.

 *

 * @author John A. Torres

 * @version 9/10/2017

 */

public class Station implements Comparable

{



    /* Static Station meta data */

    final public int lineNum;

    final public int ldsID; // double check

    final public int drop;

    final public String location;

    final public List<LoopDetector> loops;

    final public int routeNumber;

    final public double postmile;

    final public DIRECTION direction;



    /* Dynamic Station data */

    private int MLTotVol;

    private int OppTotVol;



    /* Constructor */

    public Station(int lineNum, int ldsID, int drop,

            String location, List<LoopDetector> loops, int hwy,

            DIRECTION direction, double postmile)

    {

        this.lineNum = lineNum;

        this.ldsID = ldsID;

        this.drop = drop;

        this.loops = loops;

        this.location = location;

        this.postmile = postmile;

        this.direction = direction;

        this.routeNumber = hwy;



        this.MLTotVol = getMLTotVol();

        this.OppTotVol = getOPPTotVol();

    }

    

    /**

     * Calculates the total ML Volume.

     * 

     * @return total ML volume.

     */

    private int getMLTotVol()

    {

        int mlTotVol = 0;

        for(LoopDetector loop : loops)

        {

            if(loop.loopLocation.startsWith("ML"))

            {

                mlTotVol += loop.vol;

            }

        }

        return mlTotVol;

    }

    

    /**

     * Calculates the total OPP Volume

     * 

     * @return total OPP volume.

     */

    private int getOPPTotVol()

    {

        int oppTotVol = 0;

        for(LoopDetector loop : loops)

        {

            if(loop.loopLocation.startsWith("OS"))

            {

                oppTotVol += loop.vol;

            }

        }

        return oppTotVol;

    }



    /**

     * Returns the station metadata in condensed form. This is just a quick

     * script function to make a proper highway metadata configuration file, so

     * that we can read the network faster.

     *

     * @return station metadata

     */

    public String getStationMeta()

    {

        StringBuilder build = new StringBuilder();

        build.append(Integer.toString(this.ldsID));

        build.append(" ");

        build.append(Integer.toString(this.drop));

        build.append(" ");

        build.append(Integer.toString(this.routeNumber));

        build.append(" ");

        build.append(this.direction.getLetter());

        build.append(" ");

        build.append(Double.toString(this.postmile));

        build.append(" ");

        build.append(Integer.toString(loops.size()));

        build.append(" ");

        build.append(this.location);

        build.append("\n");

        for (LoopDetector loop : loops)

        {

            build.append(loop.getLoopMeta());

        }

        return build.toString();

    }



    /**

     * Compare this Station to another by postmile. Note: This might be better

     * as a Comparator since it checks only one field.

     */

    @Override

    public int compareTo(Object otherStation)

    {

        // check for identity

        if (this == otherStation)

        {

            return 0;

        }

        // check that Object is of type Station, if not throw exception

        if (!(otherStation instanceof Station))

        {

            throw new ClassCastException("A Station object expected.");

        }



        // get difference of values

        double otherStationPostmile = ((Station) otherStation).postmile;

        double val = this.postmile - otherStationPostmile;



        // set appropriate comparable return value

        int retval = 0;

        if (val > 0)

        {

            retval = 1;

        }

        else if (val < 0)

        {

            retval = -1;

        }



        return retval;

    }



    /** Determine which lane fields to update based on given direction

     * and update all the loop detectors with the given color.

     * @param direction desired highway direction

     * @param dotColor desired dot color

     */

    public void updateByDirection(DIRECTION direction, DOTCOLOR dotColor) 

    {

        String laneDir = "OS";

        if(direction.equals(this.direction))

        {

            laneDir = "ML";

        }

        outputUpdateMessage(dotColor, laneDir);

        

        for(LoopDetector loop : loops)

        {

            if(loop.loopLocation.startsWith(laneDir))

            {

                // UPDATE LOOP WITH VALUES

                int speed = 0;

                loop.updateLoop(dotColor.volume(), dotColor.occupancy(), speed);

            }

        }

        

        this.MLTotVol = getMLTotVol();

        this.OppTotVol = getOPPTotVol();

    }

    

    /**

     * Output for updateByDirection. Logs the update to the console.

     * 

     * @param dotcolor

     * @param OPP_ML 

     */

    private void outputUpdateMessage(DOTCOLOR dotcolor, String OPP_ML)

    {

        System.out.printf("Updating %-3.3s %-5.5s %-3.3s lanes\t %-12.12s "

                + "at postmile %-6.6s to %-7.7s\n", 

                Integer.toString(this.routeNumber), this.direction.name(), 

                OPP_ML, this.location, Double.toString(this.postmile), 

                dotcolor.name());

    }

    

    /**

     * XML tags used for toXML() method.

     */

    private static enum XML_TAGS

    {



        STATION("Station"),

        LDS_ID("LDS_ID"),

        LINE_NUM("Line_Num"),

        DROP("Drop"),

        LOOPS("Loops"),

        LOCATION("Location"),

        POST_MILE("Post_Mile"),

        DIRECTION("Direction"),

        FREEWAY("Freeway"),

        ML_TOT_VOL("ML_Tot_Vol"),

        OPP_TOT_VOL("Opp_Tot_Vol");



        String tag;



        private XML_TAGS(String n)

        {

            tag = n;

        }

    }

    

    /**

     * Returns the Station data in XMLFormat.

     * 

     * @param currElem The current XML <Station> element

     */

    public void toXML(Element currElem)

    {

        Document theDoc = currElem.getOwnerDocument();



        Element stationElement = theDoc.createElement(XML_TAGS.STATION.tag);

        currElem.appendChild(stationElement);



        Element ldsIDElement = theDoc.createElement(XML_TAGS.LDS_ID.tag);

        ldsIDElement.appendChild(theDoc.createTextNode(String.valueOf(this.ldsID)));

        stationElement.appendChild(ldsIDElement);



        Element lineNumElement = theDoc.createElement(XML_TAGS.LINE_NUM.tag);

        lineNumElement.appendChild(theDoc.createTextNode(String.valueOf(this.lineNum)));

        stationElement.appendChild(lineNumElement);



        Element dropElement = theDoc.createElement(XML_TAGS.DROP.tag);

        dropElement.appendChild(theDoc.createTextNode(String.valueOf(this.drop)));

        stationElement.appendChild(dropElement);



        Element locationElement = theDoc.createElement(XML_TAGS.LOCATION.tag);

        locationElement.appendChild(theDoc.createTextNode(this.location));

        stationElement.appendChild(locationElement);



        Element postMileElement = theDoc.createElement(XML_TAGS.POST_MILE.tag);

        postMileElement.appendChild(theDoc.createTextNode(String.valueOf(this.postmile)));

        stationElement.appendChild(postMileElement);



        Element directionElement = theDoc.createElement(XML_TAGS.DIRECTION.tag);

        directionElement.appendChild(theDoc.createTextNode("" + this.direction.getLetter()));

        stationElement.appendChild(directionElement);



        Element freewayElement = theDoc.createElement(XML_TAGS.FREEWAY.tag);

        freewayElement.appendChild(theDoc.createTextNode(String.valueOf(this.routeNumber)));

        stationElement.appendChild(freewayElement);



        Element mlElement = theDoc.createElement(XML_TAGS.ML_TOT_VOL.tag);

        mlElement.appendChild(theDoc.createTextNode(String.valueOf(this.MLTotVol)));

        stationElement.appendChild(mlElement);



        Element oppElement = theDoc.createElement(XML_TAGS.OPP_TOT_VOL.tag);

        oppElement.appendChild(theDoc.createTextNode(String.valueOf(this.OppTotVol)));

        stationElement.appendChild(oppElement);



        Element loopsElement = theDoc.createElement(XML_TAGS.LOOPS.tag);

        stationElement.appendChild(loopsElement);



        for (LoopDetector loop : loops)

        {

            loop.toXML(loopsElement);

        }

    }



    /**

     * Enum for freeway direction.

     *

     * @author John A. Torres

     * @version 9/10/2017

     */

    public static enum DIRECTION

    {

        NORTH,

        SOUTH,

        EAST,

        WEST;



        // All the first letters of the values, in order.

        private static String allLetters = "NSEW";



        /**

         * Return the first letter of this enum.

         *

         * @return String first letter of this enum.

         */

        public String getLetter()

        {

            return this.toString().substring(0, 1);

        }



        /**

         * Returns a direction given its first character.

         *

         * @param letter the first character of a direction

         * @return direction corresponding to letter

         * @pre letter must be one of allLetters

         */

        public static DIRECTION toDirection(String letter)

        {

            return values()[allLetters.indexOf(letter.charAt(0))];

        }



    }

}