1.0
Posted by Anonymous on Fri 18th Nov 2011 07:48
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package ubc.cs.cpsc210.sustainabilityapp.routing;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.util.Log;

import ubc.cs.cpsc210.sustainabilityapp.model.LatLong;

/**
 * Wrapper around a service which calculates routes between geographic
 * locations. This class may be called concurrently from multiple threads -- it
 * is thread-safe.
 *
 * Currently, this class wraps the www.yournavigation.org API (<a
 * href="http://wiki.openstreetmap.org/wiki/YOURS#Routing_API"
 * >http://wiki.openstreetmap.org/wiki/YOURS#Routing_API</a>).
 */
public class RoutingService {

        /**
         * Caches routes retrieved by their endpoints. Access to this map must be
         * synchronized on the map.
         */
        private Map<RouteEndpoints, RouteInfo> routeCache = new HashMap<RouteEndpoints, RouteInfo>();

        /**
         * Client for making HTTP requests to the API of the service.
         */
        private HttpClient client;

        public RoutingService() {
                // Create an HttpClient with the ThreadSafeClientConnManager.
                // This connection manager must be used if more than one thread will
                // be accessing the HttpClient.
                HttpParams params = new BasicHttpParams();
                HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

                SchemeRegistry schemeRegistry = new SchemeRegistry();
                schemeRegistry.register(new Scheme("http", PlainSocketFactory
                                .getSocketFactory(), 80));

                ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(
                                params, schemeRegistry);
                client = new DefaultHttpClient(cm, params);
        }

        public void shutdown() {
                if (client != null) {
                        client.getConnectionManager().shutdown();
                }
        }

        /**
         * Calculate route for given start point and end point. An internet
         * connection must be available. See {@link getRouteFromService} for further
         * information on route generation.
         *
         * @param start
         *            The start point of the route.
         * @param end
         *            The end point of the route.
         * @param useCache
         *            Indicates whether the service should return a cached route, if
         *            one exists. If this flag is set to true, and a cached route is
         *            not available, then the new route obtained from the server
         *            will be cached.
         * @return Information on the route calculated, including the waypoints.
         * @throws IOException
         *             If an error occurs while retrieving the route from the
         *             server.
         */
        public RouteInfo getRoute(LatLong start, LatLong end, boolean useCache)
                        throws IOException {
                RouteEndpoints endpoints = new RouteEndpoints(start,end);
                RouteInfo ri;

                try {
                        ri=getRouteFromService(endpoints);
                } catch (URISyntaxException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }

                return null;
        }

        /**
         * Calculate route for given endpoints. Currently, we use the
         * www.yournavigation.org API (<a
         * href="http://wiki.openstreetmap.org/wiki/YOURS#Routing_API"
         * >http://wiki.openstreetmap.org/wiki/YOURS#Routing_API</a>), with result
         * format set to geojson, vehicle set to foot and route type set to shortest
         * (rather than fastest). Using route type of fastest can result in
         * different routes between the same two points, depending on the direction
         * traveled.
         *
         * Subclasses can override this method to connect to alternate routing
         * services.
         *
         * @param endpoints
         *            Endpoints of the route.
         * @return Information on the route calculated, including waypoints.
         * @throws IOException
         *             If an error occurs while retrieving the route from the
         *             server.
         * @throws URISyntaxException
         */
        protected RouteInfo getRouteFromService(RouteEndpoints endpoints) throws IOException, URISyntaxException {
                String requestString, returnedString;
                HttpGet hg;
                URI uri = null;
                List<LatLong> waypoints = new ArrayList<LatLong>();

                requestString = "http://www.yournavigation.org/api/1.0/gosmore.php?format=geojson";
                requestString += "&flat=" + endpoints.getStart().getLatitude();
                requestString += "&flon=" + endpoints.getStart().getLongitude();
                requestString += "&tlat=" + endpoints.getEnd().getLatitude();
                requestString += "&tlon=" + endpoints.getEnd().getLongitude();
                requestString += "&v=foot";
                requestString += "&fast=0";
                requestString += "&layer=mapnik";

                System.out.println(requestString);

                try {
                uri = new URI(requestString);
                }
                catch (URISyntaxException e)
                {
                        // handle exception
                }

                hg = new HttpGet(uri);
                hg.addHeader("X-Yours-client", "UBC CPSC 210");

/*              ResponseHandler<String> handler = new ResponseHandler<String>() {
                    public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
                        HttpEntity entity = response.getEntity();
                        if (entity != null) {
                                return EntityUtils.toString(entity);
                        } else {
                            return null;
                        }
                    }
                }; */

                ResponseHandler<String> responseHandler = new BasicResponseHandler();

                returnedString = client.execute(hg, responseHandler);

                System.out.println(returnedString);

                JSONObject json = new JSONObject();

                return null;

        }

        private RouteInfo getCachedRoute(RouteEndpoints endpoints) {
                synchronized (routeCache) {
                        return routeCache.get(endpoints);
                }
        }

        private void addRouteToCache(RouteEndpoints endpoints, RouteInfo routeInfo) {
                synchronized (routeCache) {
                        routeCache.put(endpoints, routeInfo);
                }
        }
}