git.gag.com Git - fw/altos/blob - altosui/AltosSiteMapCache.java

   1 /*
   2  * Copyright © 2010 Anthony Towns <aj@erisian.com.au>
   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; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package altosui;
  19
  20 import java.awt.*;
  21 import java.awt.image.*;
  22 import java.awt.event.*;
  23 import javax.swing.*;
  24 import javax.imageio.ImageIO;
  25 import javax.swing.table.*;
  26 import java.io.*;
  27 import java.util.*;
  28 import java.text.*;
  29 import java.util.prefs.*;
  30 import java.net.URL;
  31 import java.net.URLConnection;
  32 import org.altusmetrum.AltosLib.*;
  33
  34 public class AltosSiteMapCache extends JLabel {
  35         public static boolean fetchMap(File file, String url) {
  36                 URL u;
  37
  38                 try {
  39                         u = new URL(url);
  40                 } catch (java.net.MalformedURLException e) {
  41                         return false;
  42                 }
  43
  44                 byte[] data;
  45                 try {
  46                         URLConnection uc = u.openConnection();
  47                         int contentLength = uc.getContentLength();
  48                         InputStream in = new BufferedInputStream(uc.getInputStream());
  49                         int bytesRead = 0;
  50                         int offset = 0;
  51                         data = new byte[contentLength];
  52                         while (offset < contentLength) {
  53                                 bytesRead = in.read(data, offset, data.length - offset);
  54                                 if (bytesRead == -1)
  55                                         break;
  56                                 offset += bytesRead;
  57                         }
  58                         in.close();
  59
  60                         if (offset != contentLength) {
  61                                 return false;
  62                         }
  63                 } catch (IOException e) {
  64                         return false;
  65                 }
  66
  67                 try {
  68                         FileOutputStream out = new FileOutputStream(file);
  69                         out.write(data);
  70                         out.flush();
  71                         out.close();
  72                 } catch (FileNotFoundException e) {
  73                         return false;
  74                 } catch (IOException e) {
  75                         if (file.exists()) {
  76                                 file.delete();
  77                         }
  78                         return false;
  79                 }
  80                 return true;
  81         }
  82
  83         public static ImageIcon fetchAndLoadMap(File pngfile, String url) {
  84                 if (!pngfile.exists()) {
  85                         if (!fetchMap(pngfile, url)) {
  86                                 return null;
  87                         }
  88                 }
  89                 return loadMap(pngfile, url);
  90         }
  91
  92         public static ImageIcon loadMap(File pngfile, String url) {
  93                 if (!pngfile.exists()) {
  94                         return null;
  95                 }
  96
  97                 try {
  98                         return new ImageIcon(ImageIO.read(pngfile));
  99                 } catch (IOException e) {
 100                         System.out.printf("# IO error trying to load %s\n", pngfile);
 101                         return null;
 102                 }
 103         }
 104 }