class NumberTools {
/**
* Converts a long to a String suitable for indexing.
*/
public static String longToString(long l) {
if (l == Long.MIN_VALUE) {
// special case, because long is not symmetric around zero
return MIN_STRING_VALUE;
}
StringBuffer buf = new StringBuffer(STR_SIZE);
if (l < 0) {
buf.append(NEGATIVE_PREFIX);
l = Long.MAX_VALUE + l + 1;
} else {
buf.append(POSITIVE_PREFIX);
}
String num = Long.toString(l, RADIX);
int padLen = STR_SIZE - num.length() - buf.length();
while (padLen-- > 0) {
buf.append('0');
}
buf.append(num);
return buf.toString();
}
}
