git.gag.com Git - fw/altos/blob - altoslib/AltosMapStore.java

   1 /*
   2  * Copyright © 2014 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 package org.altusmetrum.altoslib_14;
  20
  21 import java.io.*;
  22 import java.net.*;
  23 import java.util.*;
  24
  25 public class AltosMapStore {
  26         String                                  url;
  27         public File                             file;
  28         LinkedList<AltosMapStoreListener>       listeners = new LinkedList<AltosMapStoreListener>();
  29
  30         int                                     status;
  31
  32         private static File map_file(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
  33                 double lat = center.lat;
  34                 double lon = center.lon;
  35                 char chlat = lat < 0 ? 'S' : 'N';
  36                 char chlon = lon < 0 ? 'W' : 'E';
  37
  38                 if (lat < 0) lat = -lat;
  39                 if (lon < 0) lon = -lon;
  40                 String maptype_string = String.format("%s-", AltosMap.maptype_names[maptype]);
  41                 String format_string;
  42                 if (maptype == AltosMap.maptype_hybrid || maptype == AltosMap.maptype_satellite || maptype == AltosMap.maptype_terrain)
  43                         format_string = "jpg";
  44                 else
  45                         format_string = "png";
  46                 return new File(AltosPreferences.mapdir(),
  47                                 String.format("map-%c%.6f,%c%.6f-%s%d%s.%s",
  48                                               chlat, lat, chlon, lon, maptype_string, zoom, scale == 1 ? "" : String.format("-%d", scale), format_string));
  49         }
  50
  51         public static String google_maps_api_key = null;
  52
  53         private static String google_map_url(AltosLatLon center, int zoom, int maptype, int px_size, int scale, String format_string) {
  54                 return String.format("http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&scale=%d&sensor=false&maptype=%s&format=%s&key=%s",
  55                                      center.lat, center.lon, zoom, px_size, px_size, scale,
  56                                      AltosMap.maptype_names[maptype], format_string, google_maps_api_key);
  57         }
  58
  59         private static String altos_map_url(AltosLatLon center, int zoom, int maptype, int px_size, int scale, String format_string) {
  60                 return String.format("https://maps.altusmetrum.org/cgi-bin/altos-map?lat=%.6f&lon=%.6f&zoom=%d",
  61                                      center.lat, center.lon, zoom);
  62         }
  63
  64         private static String map_url(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
  65                 String format_string;
  66
  67                 if (maptype == AltosMap.maptype_hybrid || maptype == AltosMap.maptype_satellite || maptype == AltosMap.maptype_terrain)
  68                         format_string = "jpg";
  69                 else
  70                         format_string = "png32";
  71
  72                 for (int s = 1; s < scale; s <<= 1)
  73                         zoom--;
  74
  75                 px_size /= scale;
  76
  77                 if (google_maps_api_key != null)
  78                         return google_map_url(center, zoom, maptype, px_size, scale, format_string);
  79                 else
  80                         return altos_map_url(center, zoom, maptype, px_size, scale, format_string);
  81         }
  82
  83         public synchronized int status() {
  84                 return status;
  85         }
  86
  87         public synchronized void add_listener(AltosMapStoreListener listener) {
  88                 if (!listeners.contains(listener))
  89                         listeners.add(listener);
  90                 listener.notify_store(this, status);
  91         }
  92
  93         public synchronized void remove_listener(AltosMapStoreListener listener) {
  94                 listeners.remove(listener);
  95         }
  96
  97         private synchronized void notify_listeners(int status) {
  98                 this.status = status;
  99                 for (AltosMapStoreListener listener : listeners)
 100                         listener.notify_store(this, status);
 101         }
 102
 103         private int fetch_url() {
 104                 URL u;
 105
 106                 try {
 107                         u = new URL(url);
 108                 } catch (java.net.MalformedURLException e) {
 109                         return AltosMapTile.bad_request;
 110                 }
 111
 112                 byte[] data = null;
 113                 URLConnection uc = null;
 114
 115                 int status = AltosMapTile.failed;
 116                 int tries = 0;
 117
 118                 while (tries < 10 && status != AltosMapTile.fetched) {
 119                         try {
 120                                 uc = u.openConnection();
 121                                 String type = uc.getContentType();
 122                                 int contentLength = uc.getContentLength();
 123                                 if (uc instanceof HttpURLConnection) {
 124                                         int response = ((HttpURLConnection) uc).getResponseCode();
 125                                         switch (response) {
 126                                         case HttpURLConnection.HTTP_FORBIDDEN:
 127                                         case HttpURLConnection.HTTP_PAYMENT_REQUIRED:
 128                                         case HttpURLConnection.HTTP_UNAUTHORIZED:
 129                                                 return AltosMapTile.forbidden;
 130                                         }
 131                                 }
 132                                 InputStream in = new BufferedInputStream(uc.getInputStream());
 133                                 int bytesRead = 0;
 134                                 byte[] buffer = new byte[4096];
 135                                 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 136                                 while ((bytesRead = in.read(buffer)) != -1) {
 137                                         baos.write(buffer, 0, bytesRead);
 138                                 }
 139                                 in.close();
 140                                 data = baos.toByteArray();
 141
 142                                 status = AltosMapTile.fetched;
 143
 144                         } catch (IOException e) {
 145                                 status = AltosMapTile.failed;
 146                         }
 147
 148                         if (status != AltosMapTile.fetched) {
 149                                 try {
 150                                         Thread.sleep(100);
 151                                 } catch (InterruptedException ie) {
 152                                 }
 153                                 tries++;
 154                                 System.out.printf("Fetch failed, retrying %d\n", tries);
 155                         }
 156                 }
 157
 158                 if (status != AltosMapTile.fetched)
 159                         return status;
 160
 161                 try {
 162                         FileOutputStream out = new FileOutputStream(file);
 163                         if (data != null)
 164                                 out.write(data);
 165                         out.flush();
 166                         out.close();
 167                 } catch (FileNotFoundException e) {
 168                         return AltosMapTile.bad_request;
 169                 } catch (IOException e) {
 170                         if (file.exists())
 171                                 file.delete();
 172                         return AltosMapTile.bad_request;
 173                 }
 174                 return AltosMapTile.fetched;
 175         }
 176
 177         static Object   fetch_lock = new Object();
 178
 179         static Object   fetcher_lock = new Object();
 180
 181         static LinkedList<AltosMapStore> waiting = new LinkedList<AltosMapStore>();
 182         static LinkedList<AltosMapStore> running = new LinkedList<AltosMapStore>();
 183
 184         static int concurrent_fetchers() {
 185                 if (google_maps_api_key == null)
 186                         return 16;
 187                 return 128;
 188         }
 189
 190         static void start_fetchers() {
 191                 while (!waiting.isEmpty() && running.size() < concurrent_fetchers()) {
 192                         AltosMapStore   s = waiting.remove();
 193                         running.add(s);
 194                         Thread lt = s.make_fetcher_thread();
 195                         lt.start();
 196                 }
 197         }
 198
 199         void finish_fetcher() {
 200                 synchronized(fetcher_lock) {
 201                         running.remove(this);
 202                         start_fetchers();
 203                 }
 204         }
 205
 206         void add_fetcher() {
 207                 synchronized(fetcher_lock) {
 208                         waiting.add(this);
 209                         start_fetchers();
 210                 }
 211         }
 212
 213         class fetcher implements Runnable {
 214
 215                 public void run() {
 216                         try {
 217                                 if (file.exists()) {
 218                                         notify_listeners(AltosMapTile.fetched);
 219                                         return;
 220                                 }
 221
 222                                 int new_status;
 223
 224                                 new_status = fetch_url();
 225
 226                                 notify_listeners(new_status);
 227                         } finally {
 228                                 finish_fetcher();
 229                         }
 230                 }
 231         }
 232
 233         private Thread make_fetcher_thread() {
 234                 return new Thread(new fetcher());
 235         }
 236
 237         private void fetch() {
 238                 add_fetcher();
 239         }
 240
 241         private AltosMapStore (String url, File file) {
 242                 this.url = url;
 243                 this.file = file;
 244
 245                 if (file.exists())
 246                         status = AltosMapTile.fetched;
 247                 else {
 248                         status = AltosMapTile.fetching;
 249                         fetch();
 250                 }
 251         }
 252
 253         public int hashCode() {
 254                 return url.hashCode();
 255         }
 256
 257         public boolean equals(Object o) {
 258                 if (o == null)
 259                         return false;
 260
 261                 if (!(o instanceof AltosMapStore))
 262                         return false;
 263
 264                 AltosMapStore other = (AltosMapStore) o;
 265                 return url.equals(other.url);
 266         }
 267
 268         static HashMap<String,AltosMapStore> stores = new HashMap<String,AltosMapStore>();
 269
 270         public static AltosMapStore get(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
 271                 String url = map_url(center, zoom, maptype, px_size, scale);
 272
 273                 AltosMapStore   store;
 274                 synchronized(stores) {
 275                         if (stores.containsKey(url)) {
 276                                 store = stores.get(url);
 277                         } else {
 278                                 store = new AltosMapStore(url, map_file(center, zoom, maptype, px_size, scale));
 279                                 stores.put(url, store);
 280                         }
 281                 }
 282                 return store;
 283         }
 284
 285 }