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
  33 public class AltosSiteMapCache extends JLabel {
  34         public static boolean fetchMap(File file, String url) {
  35                 URL u;
  36
  37                 try {
  38                         u = new URL(url);
  39                 } catch (java.net.MalformedURLException e) {
  40                         return false;
  41                 }
  42
  43                 byte[] data;
  44                 try {
  45                         URLConnection uc = u.openConnection();
  46                         int contentLength = uc.getContentLength();
  47                         InputStream in = new BufferedInputStream(uc.getInputStream());
  48                         int bytesRead = 0;
  49                         int offset = 0;
  50                         data = new byte[contentLength];
  51                         while (offset < contentLength) {
  52                                 bytesRead = in.read(data, offset, data.length - offset);
  53                                 if (bytesRead == -1)
  54                                         break;
  55                                 offset += bytesRead;
  56                         }
  57                         in.close();
  58
  59                         if (offset != contentLength) {
  60                                 return false;
  61                         }
  62                 } catch (IOException e) {
  63                         return false;
  64                 }
  65
  66                 try {
  67                         FileOutputStream out = new FileOutputStream(file);
  68                         out.write(data);
  69                         out.flush();
  70                         out.close();
  71                 } catch (FileNotFoundException e) {
  72                         return false;
  73                 } catch (IOException e) {
  74                         if (file.exists()) {
  75                                 file.delete();
  76                         }
  77                         return false;
  78                 }
  79                 return true;
  80         }
  81
  82         public static ImageIcon fetchAndLoadMap(File pngfile, String url) {
  83                 if (!pngfile.exists()) {
  84                         if (!fetchMap(pngfile, url)) {
  85                                 return null;
  86                         }
  87                 }
  88                 return loadMap(pngfile, url);
  89         }
  90
  91         public static ImageIcon loadMap(File pngfile, String url) {
  92                 if (!pngfile.exists()) {
  93                         return null;
  94                 }
  95
  96                 try {
  97                         return new ImageIcon(ImageIO.read(pngfile));
  98                 } catch (IOException e) {
  99                         System.out.printf("# IO error trying to load %s\n", pngfile);
 100                         return null;
 101                 }
 102         }
 103 }