/**
* Returns a variant number between 0 (inclusive) and maxVariant (exclusive). Use this method to
* get the next variant of a question in sequence. For the first attempt it returns a random
* variant and for the repeat attempts it returns next variants in sequence, when the last variant
* is reached it cycles back to the beginning.
*
* @param maxVariant
* @return variant number
*/
public int getNextVariant(int maxVariant) {
// Passing false for the 'incrementSeed' parameter to get the same
// random number generator for all question attempts.
Random r = getRandom(getClass().getName(), false);
if (r instanceof NotSoRandom) {
// If it is an instanceof NotSoRandom that means variant is fixed
// for testing, do not increment the variant
return r.nextInt(maxVariant);
}
return (r.nextInt(maxVariant) + ip.getAttempt() - 1) % maxVariant;
}
public void genSeed(ActionEvent e) {
long seed = 0;
boolean redo = false;
do {
redo = false;
String seedString =
JOptionPane.showInputDialog(
this, "Enter a number:", Long.toString(rand.nextLong(), 36)
// "Random Seed", JOptionPane.QUESTION_MESSAGE
);
if (seedString == null) return;
try {
seed = Long.parseLong(seedString, 36);
} catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(this, "Use only letters and numbers, max 12 characters.");
redo = true;
}
} while (redo);
genSeed(seed);
}
public void genRandom() {
genSeed(rand.nextLong());
}