1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* Copyright © 2010 Anthony Towns <aj@erisian.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package altosui;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
public class AltosSiteMapCache extends JLabel {
public static boolean fetchMap(File file, String url) {
URL u;
try {
u = new URL(url);
} catch (java.net.MalformedURLException e) {
return false;
}
byte[] data;
try {
URLConnection uc = u.openConnection();
int contentLength = uc.getContentLength();
InputStream in = new BufferedInputStream(uc.getInputStream());
int bytesRead = 0;
int offset = 0;
data = new byte[contentLength];
while (offset < contentLength) {
bytesRead = in.read(data, offset, data.length - offset);
if (bytesRead == -1)
break;
offset += bytesRead;
}
in.close();
if (offset != contentLength) {
return false;
}
} catch (IOException e) {
return false;
}
try {
FileOutputStream out = new FileOutputStream(file);
out.write(data);
out.flush();
out.close();
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
if (file.exists()) {
file.delete();
}
return false;
}
return true;
}
public static ImageIcon fetchAndLoadMap(File pngfile, String url) {
if (!pngfile.exists()) {
if (!fetchMap(pngfile, url)) {
return null;
}
}
return loadMap(pngfile, url);
}
public static ImageIcon loadMap(File pngfile, String url) {
if (!pngfile.exists()) {
return null;
}
try {
return new ImageIcon(ImageIO.read(pngfile));
} catch (IOException e) {
System.out.printf("# IO error trying to load %s\n", pngfile);
return null;
}
}
}
|
