com.maya.portAuthority.googleMaps.LocationTracker.java Source code

Introduction

Here is the source code for com.maya.portAuthority.googleMaps.LocationTracker.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.maya.portAuthority.googleMaps;

import java.util.ArrayList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.maya.portAuthority.InvalidInputException;
import com.maya.portAuthority.util.Location;
import com.maya.portAuthority.util.Stop;

/**
 *
 * @author Adithya
 */
public class LocationTracker {

    private static Logger log = LoggerFactory.getLogger(LocationTracker.class);

    /**
     * Case 1: Request returns list of Coordinates
     * Proceed to Step 2
     * 
     * Case 2: Unable to understand source location
     * Ask user to try again.
        
     * 
     * @param json returned by striking the Google maps API
     * @param limit set limit to the number of places returned by the API
     * @return
     * @throws JSONException 
     */
    public static List<Location> getLatLngDetails(JSONObject json, int limit)
            throws JSONException, InvalidInputException {
        List<Location> output = new ArrayList<>();

        JSONArray results = json.getJSONArray("results");
        log.debug("JSON Results Size={}", results.length());
        if (results.length() == 0) {
            throw new InvalidInputException("No results from JSON", "I did not understand the source location");
        }
        int numResultsToReturn = Math.min(limit, results.length());

        JSONObject result;
        JSONObject location;

        for (int i = 0; i < numResultsToReturn; i++) {
            result = results.getJSONObject(i);

            location = result.getJSONObject("geometry").getJSONObject("location");
            Location c = new Location(result.getString("name"), location.getDouble("lat"),
                    location.getDouble("lng"), result.getString("formatted_address"),
                    makeList(result.getJSONArray("types")));

            output.add(c);
        }
        return output;
    }

    private static List<String> makeList(JSONArray array) throws JSONException {
        List<String> output = new ArrayList<String>();
        for (int i = 0; i < array.length(); i++) {
            output.add(array.getString(i));
        }
        return output;
    }

    public static List<Stop> getStopDetails(JSONObject json) throws JSONException {
        List<Stop> stops = new ArrayList<>();
        JSONArray stopsResponse = json.getJSONObject("bustime-response").getJSONArray("stops");

        if (stopsResponse != null) {
            for (int i = 0; i < stopsResponse.length(); i++) {
                JSONObject stop = stopsResponse.getJSONObject(i);
                double lat = stop.getDouble("lat");
                double lon = stop.getDouble("lon");
                String stopID = stop.getString("stpid");
                String stpnm = stop.getString("stpnm");
                Stop s = new Stop(stopID, stpnm, lat, lon);
                stops.add(s);
            }
        }
        return stops;
    }
}