// sets all bits at a certain index to the given value
private static void setWord(JsArrayInteger array, int index, int value) {
// keep 0s out of the array
if (value == 0) {
deleteWord(array, index);
} else {
array.set(index, value);
}
}
public void clear(int fromIndex, int toIndex) {
checkRange(fromIndex, toIndex);
int length = length();
if (fromIndex >= length) {
// nothing to do
return;
}
// check to see if toIndex is greater than our array length
if (toIndex >= length) {
// truncate the array by setting it's length
int newLength = wordIndex(fromIndex + 31);
setLengthWords(array, newLength);
// remove the extra bits off the end
if ((bitIndex(newLength)) - fromIndex != 0) {
maskOutWord(array, newLength - 1, bitOffset(fromIndex), 32);
}
} else {
int first = wordIndex(fromIndex);
int last = wordIndex(toIndex);
int startBit = bitOffset(fromIndex);
int endBit = bitOffset(toIndex);
if (first == last) {
// clear the bits in between first and last
maskOutWord(array, first, startBit, endBit);
} else {
// clear the bits from fromIndex to the next 32 bit boundary
if (startBit != 0) {
maskOutWord(array, first++, startBit, 32);
}
// clear the bits from the last 32 bit boundary to the toIndex
if (endBit != 0) {
maskOutWord(array, last, 0, endBit);
}
//
// delete everything in between
//
for (int i = first; i < last; i++) {
deleteWord(array, i);
}
}
}
}