at.uni_salzburg.cs.ckgroup.pilot.PositionProxy.java Source code

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Here is the source code for at.uni_salzburg.cs.ckgroup.pilot.PositionProxy.java

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/*
 * @(#) PositionProxy.java
 *
 * This code is part of the JNavigator project.
 * Copyright (c) 2012  Clemens Krainer
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package at.uni_salzburg.cs.ckgroup.pilot;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import at.uni_salzburg.cs.ckgroup.course.PolarCoordinate;

public class PositionProxy {

    Logger LOG = Logger.getLogger(PositionProxy.class);

    private String pilotPositionUrl;

    private Double latitude;
    private Double longitude;
    private Double altitude;
    //   private Double courseOverGround;
    //   private Double speedOverGround;
    //   private Double altitudeOverGround;
    private boolean autoPilotFlight;

    public PositionProxy(String pilotUrl) {
        if (pilotUrl == null)
            throw new NullPointerException("Pilot URL may not be null!");
        //      this.pilotPositionUrl = pilotUrl + "/json/position";
        this.pilotPositionUrl = pilotUrl + "/json/setCoursePosition";
    }

    public void fetchCurrentPosition() {
        HttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(pilotPositionUrl);
        HttpResponse response;

        String responseString = "";
        try {
            response = httpclient.execute(httpget);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                responseString = EntityUtils.toString(response.getEntity());
            } else {
                LOG.error("Error at accessing " + pilotPositionUrl + " code=" + statusCode + " reason="
                        + response.getStatusLine().getReasonPhrase());
            }
        } catch (Exception e) {
            LOG.error("Can not access " + pilotPositionUrl, e);
        }

        JSONParser parser = new JSONParser();
        try {
            JSONObject obj = (JSONObject) parser.parse(responseString);

            latitude = (Double) obj.get("latitude");
            longitude = (Double) obj.get("longitude");
            altitude = (Double) obj.get("altitude");
            //         courseOverGround = (Double)obj.get("courseOverGround");
            //         speedOverGround = (Double)obj.get("speedOverGround");
            //         altitudeOverGround = (Double)obj.get("altitudeOverGround");
            Boolean apf = (Boolean) obj.get("autoPilotFlight");
            autoPilotFlight = apf != null ? apf.booleanValue() : false;
        } catch (ParseException e) {
            LOG.error("Error at fetching current position from " + pilotPositionUrl);
        }
    }

    public PolarCoordinate getCurrentPosition() {
        if (latitude == null || longitude == null || altitude == null) {
            return null;
        }
        return new PolarCoordinate(latitude, longitude, altitude);
    }

    //   public Double getCourseOverGround() {
    //      return courseOverGround;
    //   }
    //
    //   public Double getSpeedOverGround() {
    //      return speedOverGround;
    //   }
    //
    //   public Double getAltitudeOverGround() {
    //      return altitudeOverGround;
    //   }

    public boolean isAutoPilotFlight() {
        return autoPilotFlight;
    }

}