/** @return Creates a unique path to an activity in the form of 2010-01-21-09-randombit */
public static String createId() {
Calendar c = Calendar.getInstance();
String[] vals = new String[4];
vals[0] = "" + c.get(Calendar.YEAR);
vals[1] = StringUtils.leftPad("" + (c.get(Calendar.MONTH) + 1), 2, "0");
vals[2] = StringUtils.leftPad("" + c.get(Calendar.DAY_OF_MONTH), 2, "0");
vals[3] = StringUtils.leftPad("" + c.get(Calendar.HOUR_OF_DAY), 2, "0");
StringBuilder id = new StringBuilder();
for (String v : vals) {
id.append(v).append("-");
}
byte[] bytes = new byte[20];
String randomHash = "";
try {
if (random == null) {
random = SecureRandom.getInstance("SHA1PRNG");
}
random.nextBytes(bytes);
randomHash = Arrays.toString(bytes);
randomHash = org.sakaiproject.nakamura.util.StringUtils.sha1Hash(randomHash);
} catch (NoSuchAlgorithmException e) {
} catch (UnsupportedEncodingException e) {
}
id.append(randomHash);
return id.toString();
}
