How to use

checkIndex

method

in

com.artemis.utils.BitVector

public void clear(int bitIndex) {
  checkIndex(bitIndex);
  clear(array, bitIndex);
}

public boolean get(int bitIndex) {
  checkIndex(bitIndex);
  return get(array, bitIndex);
}

public void set(int bitIndex) {
  checkIndex(bitIndex);
  set(array, bitIndex);
}

public void flip(int bitIndex) {
  checkIndex(bitIndex);
  flip(array, bitIndex);
}

public int nextClearBit(int fromIndex) {
  checkIndex(fromIndex);
  int index = wordIndex(fromIndex);
  // special case for first index
  int fromBit = fromIndex - (bitIndex(index));
  int word = getWord(array, index);
  for (int i = fromBit; i < 32; i++) {
    if ((word & (1 << i)) == 0) {
      return (bitIndex(index)) + i;
    }
  }
  // loop through the rest
  while (true) {
    index++;
    word = getWord(array, index);
    if (word != 0xffffffff) {
      return (bitIndex(index)) + Integer.numberOfTrailingZeros(~word);
    }
  }
}

public int nextSetBit(int fromIndex) {
  checkIndex(fromIndex);
  int index = wordIndex(fromIndex);
  // check the current word
  int word = getWord(array, index);
  if (word != 0) {
    for (int i = bitOffset(fromIndex); i < 32; i++) {
      if ((word & (1 << i)) != 0) {
        return (bitIndex(index)) + i;
      }
    }
  }
  index++;
  // find the next set word
  trimToSize(array);
  index = nextSetWord(array, index);
  if (index == -1) {
    return -1;
  }
  // return the next set bit
  return (bitIndex(index))
      + Integer.numberOfTrailingZeros(array.get(index));
};