public int indexBinaryStateUnsafeIndexing(char key) {
if (key != 0 && key != zeroMask) {
char[] keys = set;
long capacityMask = (long) (keys.length - 1);
long index = ((long) Primitives.hashCode(key)) & capacityMask;
long offset = index << CHAR_SCALE_SHIFT;
long CHAR_BASE = UnsafeConstants.CHAR_BASE;
char cur = U.getChar(keys, CHAR_BASE + offset);
if (cur == key) {
return (int) index;
} else {
if (cur == 0) {
return -1;
} else {
long capacityOffsetMask = capacityMask << CHAR_SCALE_SHIFT;
while (true) {
offset = (offset + CHAR_SCALE) & capacityOffsetMask;
if ((cur = U.getChar(keys, CHAR_BASE + offset)) == key) {
return (int) (offset >> CHAR_SCALE_SHIFT);
} else if (cur == 0) {
return -1;
}
}
}
}
} else {
return -1;
}
}
public boolean addBinaryStateUnsafeIndexing(char key) {
if (key == 0 || key == zeroMask) {
return false;
}
char[] keys = set;
long capacityMask = (long) (keys.length - 1);
long index = ((long) Primitives.hashCode(key)) & capacityMask;
long offset = index << CHAR_SCALE_SHIFT;
char cur = U.getChar(keys, CHAR_BASE + offset);
keyAbsent:
if (cur != 0) {
if (cur == key) {
return false;
} else {
long capacityOffsetMask = capacityMask << CHAR_SCALE_SHIFT;
while (true) {
offset = (offset + CHAR_SCALE) & capacityOffsetMask;
if ((cur = U.getChar(keys, CHAR_BASE + offset)) == 0) {
break keyAbsent;
} else if (cur == key) {
return false;
}
}
}
}
// key is absent
U.putChar(keys, CHAR_BASE + offset, key);
size++;
return true;
}
public boolean removeUnsafeIndexing(char key) {
if (key == 0 || key == zeroMask) {
return false;
}
char[] keys = set;
int capacity = set.length;
int capacityMask = capacity - 1;
long capacityOffsetMask = ((long) capacityMask) << CHAR_SCALE_SHIFT;
long index = (long) (Primitives.hashCode(key) & capacityMask);
long offset = index << CHAR_SCALE_SHIFT;
char cur = U.getChar(keys, CHAR_BASE + offset);
keyPresent:
if (cur != key) {
if (cur == 0) return false;
while (true) {
offset = (offset + CHAR_SCALE) & capacityOffsetMask;
if ((cur = U.getChar(keys, CHAR_BASE + offset)) == key) {
break keyPresent;
} else if (cur == 0) {
return false;
}
}
}
// key is present
long offsetToRemove = offset;
long offsetToShift = offset;
int shiftDistance = 1;
while (true) {
offsetToShift = (offsetToShift + CHAR_SCALE) & capacityOffsetMask;
char keyToShift = U.getChar(keys, CHAR_BASE + offsetToShift);
if (keyToShift == 0) break;
int indexToShift = (int) (offsetToShift >> CHAR_SCALE_SHIFT);
int keyDistance = (indexToShift - Primitives.hashCode(keyToShift)) & capacityMask;
if (keyDistance >= shiftDistance) {
U.putChar(keys, CHAR_BASE + offsetToRemove, keyToShift);
offsetToRemove = offsetToShift;
shiftDistance = 1;
} else {
shiftDistance++;
}
}
U.putChar(keys, CHAR_BASE + offsetToRemove, (char) 0);
return true;
}
final long readSlot(long slotIndex) {
return U.getChar(this, HASH_TABLE_OFFSET + (slotIndex << 1));
}