/** Skips checks for existing keys. */
private void addResize(T key) {
// Check for empty buckets.
int hashCode = key.hashCode();
int index1 = hashCode & mask;
T key1 = keyTable[index1];
if (key1 == null) {
keyTable[index1] = key;
if (size++ >= threshold) resize(capacity << 1);
return;
}
int index2 = hash2(hashCode);
T key2 = keyTable[index2];
if (key2 == null) {
keyTable[index2] = key;
if (size++ >= threshold) resize(capacity << 1);
return;
}
int index3 = hash3(hashCode);
T key3 = keyTable[index3];
if (key3 == null) {
keyTable[index3] = key;
if (size++ >= threshold) resize(capacity << 1);
return;
}
push(key, index1, key1, index2, key2, index3, key3);
}
/** Returns true if the key was not already in the set. */
public boolean add(T key) {
if (key == null) throw new IllegalArgumentException("key cannot be null.");
T[] keyTable = this.keyTable;
// Check for existing keys.
int hashCode = key.hashCode();
int index1 = hashCode & mask;
T key1 = keyTable[index1];
if (key.equals(key1)) return false;
int index2 = hash2(hashCode);
T key2 = keyTable[index2];
if (key.equals(key2)) return false;
int index3 = hash3(hashCode);
T key3 = keyTable[index3];
if (key.equals(key3)) return false;
// Find key in the stash.
for (int i = capacity, n = i + stashSize; i < n; i++) if (key.equals(keyTable[i])) return false;
// Check for empty buckets.
if (key1 == null) {
keyTable[index1] = key;
if (size++ >= threshold) resize(capacity << 1);
return true;
}
if (key2 == null) {
keyTable[index2] = key;
if (size++ >= threshold) resize(capacity << 1);
return true;
}
if (key3 == null) {
keyTable[index3] = key;
if (size++ >= threshold) resize(capacity << 1);
return true;
}
push(key, index1, key1, index2, key2, index3, key3);
return true;
}
