/walkytalky/src/com/googlecode/eyesfree/walkytalky/WifiPointsOfInterestLocator.java

  1/*
  2 * Copyright (C) 2010 Google Inc.
  3 *
  4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  5 * use this file except in compliance with the License. You may obtain a copy of
  6 * the License at
  7 *
  8 * http://www.apache.org/licenses/LICENSE-2.0
  9 *
 10 * Unless required by applicable law or agreed to in writing, software
 11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 13 * License for the specific language governing permissions and limitations under
 14 * the License.
 15 */
 16
 17package com.googlecode.eyesfree.walkytalky;
 18
 19import com.whereabout.common.MapInfo;
 20import com.whereabout.common.Utils;
 21import com.whereabout.location.LocationManager;
 22
 23import android.graphics.Point;
 24import android.location.Location;
 25import android.os.Bundle;
 26
 27import java.io.IOException;
 28import java.util.ArrayList;
 29
 30/**
 31 * Finds the points of interest that are nearby given a map and a Location
 32 * object that has wifi data extras.
 33 * 
 34 * @author chaitaynag@google.com (Chaitanya Gharpure)
 35 * @author clchen@google.com (Charles L. Chen)
 36 */
 37public class WifiPointsOfInterestLocator {
 38    private MapInfo mapInfo;
 39
 40    private String currentMap;
 41
 42    public WifiPointsOfInterestLocator() {
 43    }
 44
 45    private void setMap(String mapName) {
 46        if (mapName.equals(currentMap)) {
 47            return;
 48        }
 49        try {
 50            mapInfo = Utils.getMapInfo(com.whereabout.common.Constants.MAP_DIR + "/" + mapName
 51                    + ".map");
 52            currentMap = mapName;
 53        } catch (IOException e) {
 54            e.printStackTrace();
 55        }
 56    }
 57
 58    private ArrayList<String> getWifiLocationsOfInterestIds(Location loc) {
 59        ArrayList<String> interests = new ArrayList<String>();
 60
 61        Bundle extras = loc.getExtras();
 62
 63        String[] matchMaps = extras.getStringArray(LocationManager.MATCH_MAPS);
 64        String[] matchLocations = extras.getStringArray(LocationManager.MATCH_LOCATIONS);
 65        double[] matchScores = extras.getDoubleArray(LocationManager.MATCH_SCORES);
 66        int[] matchXCoords = extras.getIntArray(LocationManager.MATCH_XCOORDS);
 67        int[] matchYCoords = extras.getIntArray(LocationManager.MATCH_YCOORDS);
 68        int x = extras.getInt(LocationManager.FINAL_X);
 69        int y = extras.getInt(LocationManager.FINAL_Y);
 70
 71        if ((x == 0 && y == 0) || matchLocations == null) {
 72            return null;
 73        }
 74        if ((matchLocations[0] != null) && (matchScores[0] < 10)) {
 75            setMap(matchLocations[0].substring(0, matchLocations[0].lastIndexOf('_')));
 76        } else {
 77            return null;
 78        }
 79        int i = 0;
 80        for (Point p : mapInfo.allPoints) {
 81            String id = mapInfo.allIds.get(i);
 82            String name = mapInfo.locNameIdMap.get(mapInfo.allIds.get(i));
 83            if (name != null) {
 84                double dist = Math.sqrt((p.y - y) * (p.y - y) + (p.x - x) * (p.x - x));
 85                if (dist < 100) {
 86                    interests.add(id);
 87                }
 88            }
 89            i++;
 90        }
 91        return interests;
 92    }
 93
 94    public ArrayList<String> getWifiLocationsOfInterest(Location loc) {
 95        ArrayList<String> locationsOfInterest = new ArrayList<String>();
 96        ArrayList<String> ids = getWifiLocationsOfInterestIds(loc);
 97        if (ids == null) {
 98            return null;
 99        }
100        for (String id : ids) {
101            String name = mapInfo.locNameIdMap.get(id);
102            if (!locationsOfInterest.contains(name)) {
103                locationsOfInterest.add(name);
104            }
105        }
106        return locationsOfInterest;
107    }
108
109}