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
|
---
layout: default
class: Processor
title: random
summary: Generate a random string, which is guaranteed to be a valid Java identifier
---
/**
* Generate a random string, which is guaranteed to be a valid Java
* identifier (first character is an ASCII letter, subsequent characters are
* ASCII letters or numbers). Takes an optional parameter for the length of
* string to generate; default is 8 characters.
*/
public String _random(String[] args) {
int numchars = 8;
if (args.length > 1) {
try {
numchars = Integer.parseInt(args[1]);
}
catch (NumberFormatException e) {
throw new IllegalArgumentException("Invalid character count parameter in ${random} macro.");
}
}
synchronized (Processor.class) {
if (random == null)
random = new Random();
}
char[] letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
char[] alphanums = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
char[] array = new char[numchars];
for (int i = 0; i < numchars; i++) {
char c;
if (i == 0)
c = letters[random.nextInt(letters.length)];
else
c = alphanums[random.nextInt(alphanums.length)];
array[i] = c;
}
return new String(array);
}
|
