How to use

numberOfLeadingZeros

method

in

javolution.lang.MathLib

@Override
public int length() {
  if (bits.length == 0) return 0;
  return (bits.length << 6) - MathLib.numberOfLeadingZeros(bits[bits.length -1]);
}

public  Index  valueOf(Record record) {
  int i = ((Index)record).intValue();
  int count= 0;
  for (int j = 0; j < _length;) {
    long l = bits[j++];
    count += MathLib.bitCount(l);
    if (count > i) { // Found word for record.
      int bitIndex = j << 6;
      while (count != i) {
        int shiftRight = MathLib.numberOfLeadingZeros(l) + 1;
        l <<= shiftRight;
        bitIndex -= shiftRight;
        count--;
      }
      return Index.valueOf(bitIndex);
    }
  }
  return null;
}