public void flip(int fromIndex, int toIndex) {
checkRange(fromIndex, toIndex);
int length = length();
// if we are flipping bits beyond our length, we are setting them to
// true
if (fromIndex >= length) {
set(array, fromIndex, toIndex);
return;
}
// check to see if toIndex is greater than our array length
if (toIndex >= length) {
set(array, length, toIndex);
toIndex = length;
}
int first = wordIndex(fromIndex);
int last = wordIndex(toIndex);
int startBit = bitOffset(fromIndex);
int end = bitOffset(toIndex);
if (first == last) {
// flip the bits in between first and last
flipMaskedWord(array, first, startBit, end);
} else {
// clear the bits from fromIndex to the next 32 bit boundary
if (startBit != 0) {
flipMaskedWord(array, first++, startBit, 32);
}
// clear the bits from the last 32 bit boundary to the toIndex
if (end != 0) {
flipMaskedWord(array, last, 0, end);
}
// flip everything in between
for (int i = first; i < last; i++) {
flipWord(array, i);
}
}
}
