private Tile getTile(TilesBank bank, char ch, int pos) {
int index = 0;
final int bankCapacity = bank.getBankCapacity();
for (int i = 0; i < bankCapacity; i++) {
final Tile tile = bank.getTile(i);
if ((ch == '*' && tile.getCost() == 0)
|| (ch != '*' && tile.getLetter() == ch && tile.getCost() != 0)) {
if (pos == index) {
return tile;
} else {
index++;
}
}
}
throw new IllegalArgumentException("Unknown tile: " + ch + "[" + pos + "]");
}
