/*
* Return the object that is in this set and that is equals to the given
* object. Return null if not found.
*/
public T get(T obj) {
cleanupGarbageCollectedValues();
int valuesLength = this.values.length;
int index = (obj.hashCode() & 0x7FFFFFFF) % valuesLength;
HashedReference<T> currentValue;
while ((currentValue = this.values[index]) != null) {
T referent;
if (obj.equals(referent = currentValue.get())) {
return referent;
}
index = (index + 1) % valuesLength;
}
return null;
}
@Override
public String toString() {
StringBuffer buffer = new StringBuffer("{"); // $NON-NLS-1$
for (int i = 0, length = this.values.length; i < length; i++) {
HashedReference<T> value = this.values[i];
if (value != null) {
Object ref = value.get();
if (ref != null) {
buffer.append(ref.toString());
buffer.append(", "); // $NON-NLS-1$
}
}
}
buffer.append("}"); // $NON-NLS-1$
return buffer.toString();
}
/*
* Removes the object that is in this set and that is equals to the given
* object. Return the object that was in the set, or null if not found.
*/
public Object remove(T obj) {
cleanupGarbageCollectedValues();
int valuesLength = this.values.length;
int index = (obj.hashCode() & 0x7FFFFFFF) % valuesLength;
HashedReference<T> currentValue;
while ((currentValue = this.values[index]) != null) {
Object referent;
if (obj.equals(referent = currentValue.get())) {
this.elementSize--;
this.values[index] = null;
rehash();
return referent;
}
index = (index + 1) % valuesLength;
}
return null;
}
private void addValue(HashedReference<T> value) {
Object obj = value.get();
if (obj == null) return;
int valuesLength = this.values.length;
int index = (value.hashCode() & 0x7FFFFFFF) % valuesLength;
HashedReference<T> currentValue;
while ((currentValue = this.values[index]) != null) {
if (obj.equals(currentValue.get())) {
return;
}
index = (index + 1) % valuesLength;
}
this.values[index] = value;
// assumes the threshold is never equal to the size of the table
if (++this.elementSize > this.threshold) rehash();
}
/*
* Adds the given object to this set. If an object that is equals to the
* given object already exists, do nothing. Returns the existing object or
* the new object if not found.
*/
public T add(T obj, int referenceType) {
cleanupGarbageCollectedValues();
int index = (obj.hashCode() & 0x7FFFFFFF) % this.values.length;
HashedReference<T> currentValue;
while ((currentValue = this.values[index]) != null) {
T referent;
if (obj.equals(referent = currentValue.get())) {
return referent;
}
index = (index + 1) % this.values.length;
}
this.values[index] = toReference(referenceType, obj);
// assumes the threshold is never equal to the size of the table
if (++this.elementSize > this.threshold) rehash();
return obj;
}
private void cleanupGarbageCollectedValues() {
HashedReference<?> toBeRemoved;
while ((toBeRemoved = (HashedReference<?>) this.referenceQueue.poll()) != null) {
int hashCode = toBeRemoved.hashCode();
int valuesLength = this.values.length;
int index = (hashCode & 0x7FFFFFFF) % valuesLength;
HashedReference<T> currentValue;
while ((currentValue = this.values[index]) != null) {
if (currentValue == toBeRemoved) {
// replace the value at index with the last value with the
// same hash
int sameHash = index;
int current;
while ((currentValue = this.values[current = (sameHash + 1) % valuesLength]) != null
&& currentValue.hashCode() == hashCode) sameHash = current;
this.values[index] = this.values[sameHash];
this.values[sameHash] = null;
this.elementSize--;
break;
}
index = (index + 1) % valuesLength;
}
}
}