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
|
package tim.prune.data;
public abstract class GeocacheCode
{
/** Supported providers of cache codes */
private enum Provider
{
GEOCACHING_COM("GC", "https://coord.info/"),
OPENCACHING_DE("OC", "https://www.opencaching.de/");
private final String _prefix;
private final String _url;
Provider(String inPrefix, String inUrl) {
_prefix = inPrefix;
_url = inUrl;
}
static Provider getProvider(String inCode)
{
if (inCode == null || inCode.length() < 2) {
return null;
}
for (Provider provider : values())
{
// Assume that all prefixes are the first two characters
if (provider._prefix.charAt(0) == inCode.charAt(0)
&& provider._prefix.charAt(1) == inCode.charAt(1)) {
return provider;
}
}
return null;
}
}
/** @return true if the given code is recognised and valid */
public static boolean isValidCode(String inCode)
{
if (inCode == null || !isLengthValid(inCode.length())) {
return false;
}
Provider provider = Provider.getProvider(inCode);
return provider != null && verifyCharactersAreValid(inCode);
}
/** @return true if the length of the code is acceptable */
private static boolean isLengthValid(int inLength) {
return inLength > 4 && inLength <= 8;
}
/**
* @return true if the code only contains valid letters and numbers,
* but this doesn't mean that it starts with a recognised prefix
*/
private static boolean verifyCharactersAreValid(String inCode)
{
// Note, only upper case ASCII letters and numbers are allowed
final String allowedChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
for (int i=0; i<inCode.length(); i++)
{
if (allowedChars.indexOf(inCode.charAt(i)) < 0) {
return false;
}
}
return true;
}
/** @return a suitable URL for the given code, or null if not available */
public static String getUrl(String inCode)
{
Provider provider = Provider.getProvider(inCode);
if (provider != null
&& inCode != null
&& isLengthValid(inCode.length())
&& verifyCharactersAreValid(inCode))
{
return provider._url + inCode;
}
return null;
}
}
|
