This is my first attempt to write JAVA code. could be better and better :)
This code loop through each one of the API in one file to
get the distance between each one of them.
package com.nan.lens.wellcost;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.*;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVRecord;
public class Pad {
private APIProvider provider;
public Pad(APIProvider apiProvider) {
this.provider = apiProvider;
}
public static Pad create() {
try {
return new Pad(new APIProvider("/apiFile.csv"));
} catch (IOException e) {
/*The throw statement creates a new object*/
throw new RuntimeException(e);
}
}
// read data into java from csv
public static class APIProvider {
// create map to store API_coordinates pair
private HashMap<String, ArrayList<Double>> API_LAT_LONG_1 = new HashMap<>();
private HashMap<String, ArrayList<Double>> API_LAT_LONG_2;
// create list to store coordinates
private ArrayList<Double> LAT_LONG = new ArrayList<Double>();
private ArrayList<Double> temp = new ArrayList<Double>();
public APIProvider(String apiFile) throws IOException {
InputStream input = Pad.class.getResourceAsStream(apiFile);
Iterable<CSVRecord> records = CSVFormat.EXCEL.parse(new InputStreamReader(input));
for (CSVRecord record : records) {
String key = record.get(0);
temp.clear();
/*Force to change type String to Double*/
temp.add(0, Double.valueOf(record.get(1)));
temp.add(1, Double.valueOf(record.get(2)));
LAT_LONG = (ArrayList<Double>) temp.clone();
API_LAT_LONG_1.put(key, LAT_LONG);
}
//System.out.println("API_LAT_LONG: " + API_LAT_LONG_1);
API_LAT_LONG_2 = (HashMap) API_LAT_LONG_1.clone();
HashMap<String, ArrayList<String>> API_DIST = new HashMap<>();
ArrayList<String> api_dist_list;
ArrayList<String> temp_list = new ArrayList<String>();
final int R = 6371; // Radius of the earth in km
for (String key : API_LAT_LONG_1.keySet()) {
//get lat and long from ArrayList
List<Double> list = new ArrayList<Double>();
list = API_LAT_LONG_1.get(key);
Double lat1 = list.get(0);
Double lng1 = list.get(1);
for (String key2 : API_LAT_LONG_2.keySet()) {
List<Double> list2 = new ArrayList<Double>();
list2 = API_LAT_LONG_2.get(key2);
Double lat2 = list2.get(0);
Double lng2 = list2.get(1);
// Calculate distance between two points
double latDistance = Math.toRadians(lat2 - lat1);
double lonDistance = Math.toRadians(lng2 - lng1);
double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2)
+ Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2))
* Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
double distance = R * c; //km
distance = Math.pow(distance, 2);
if (key != key2 && distance < 0.0762) { // (km)
String UID = UUID.randomUUID().toString();
temp_list.clear();
temp_list.add(0, key);
temp_list.add(1, key2);
temp_list.add(2, String.valueOf(distance));
api_dist_list = (ArrayList<String>) temp_list.clone();
API_DIST.put(UID, api_dist_list);
}
}
}
System.out.println(API_DIST);
}
}
}
