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Adding both forms of flip() to BitSet.

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This commit is contained in:
Mike Keesey
2012-07-02 13:21:31 -06:00
parent 31311160c3
commit d419899ac1
2 changed files with 51 additions and 0 deletions
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24
classpath/java/util/BitSet.java
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@ -80,6 +80,30 @@ public class BitSet implements Serializable, Cloneable {
bits[i] ^= otherBits.bits[i];
}
}
public void flip(int index) {
flip(index, index+1);
}
public void flip(int fromIndex, int toIndex) {
if (fromIndex > toIndex || fromIndex < 0 || toIndex < 0) {
throw new IndexOutOfBoundsException();
} else if (fromIndex != toIndex) {
int basePartition = longPosition(fromIndex);
int lastPartition = longPosition(toIndex - 1); //range is [fromIndex, toIndex)
int numPartitionsToTraverse = lastPartition - basePartition + 1;
enlarge(lastPartition);
int currentFirstIndex = fromIndex;
for (int i = 0; i < numPartitionsToTraverse; ++i) {
int currentToIndex = Math.min(toIndex, (basePartition + i + 1) * BITS_PER_LONG);
int currentRange = currentToIndex - currentFirstIndex;
long mask = (((1L << currentRange) - 1L) << (currentFirstIndex % BITS_PER_LONG));
bits[i + basePartition] ^= mask;
currentFirstIndex = currentToIndex;
}
}
}
private void enlarge(int newSize) {
if (bits == null || bits.length < newSize) {