W3WApi.java

package com.ianturton.w3w;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;

public class W3WApi {
	// to fetch position of words use
	// https://api.what3words.com/w3w?key=YOURAPIKEY&string=word1.word2.word3
	// to fetch words for position use
	// https://api.what3words.com/position?key=YOURAPIKEY&position=lat,long

	final static private GeometryFactory geomFac = new GeometryFactory();
	private String key;

	public W3WApi() throws FileNotFoundException, IOException {
		this(".w3wkey");
	}

	public W3WApi(String keyFile) throws FileNotFoundException, IOException {
		String home = System.getenv("HOME");
		File keyfile = new File(home, keyFile);
		BufferedReader bufferedReader = new BufferedReader(new FileReader(keyfile));
		key = bufferedReader.readLine();
		bufferedReader.close();
	}
	public String getWords(Point p) {
		ArrayList<String> ret = new ArrayList<>();
		try {
			URL fetch = new URL("https://api.what3words.com/position?key=" + key + "&position=" + p.getX()+","+p.getY());
			InputStreamReader reader = new InputStreamReader(fetch.openStream());
			JSONParser parser = new JSONParser();
			JSONObject out = (JSONObject) parser.parse(reader);
			JSONArray w =  (JSONArray) out.get("words");
			for(int i=0;i<w.size();i++) {
				ret.add((String) w.get(i));
			}
			
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		StringBuilder sb = new StringBuilder();
		String sep = "";
		String separator=".";
    for(String s: ret) {
        sb.append(sep).append(s);
        
				sep = separator;
    }
		return sb.toString();
	}
 	public Point getPosition(String w1, String w2, String w3) {
		return getPosition(w1 + "." + w2 + "." + w3);
	}

	public Point getPosition(String words) {
		Coordinate coord = new Coordinate(Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY);
		
		try {
			URL fetch = new URL("https://api.what3words.com/w3w?key=" + key + "&string=" + words);
			InputStreamReader reader = new InputStreamReader(fetch.openStream());
			JSONParser parser = new JSONParser();
			JSONObject out = (JSONObject) parser.parse(reader);
			JSONArray p = (JSONArray) out.get("position");
			coord = new Coordinate(((Double) p.get(0)).doubleValue(), 
					((Double) p.get(1)).doubleValue());
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		Point ret = geomFac.createPoint(coord);
		return ret;

	}

	public static void main(String[] args) throws FileNotFoundException, IOException {
		W3WApi test = new W3WApi();
		Point p1 = test.getPosition("daring", "lion", "race");
		System.out.println(p1);
		Point p2 = test.getPosition("glee", "elder", "gazed");
		System.out.println(p2);
		String w1 = test.getWords(p1);
		System.out.println(w1);
		String w2 = test.getWords(p2);
		System.out.println(w2);
	}
}