/// <summary>
/// Either get the existing value or create a
/// new one in a single operation.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
private void AddUnique(DDIndex key, WeakReference <DD> value)
{
int hashCode = key.GetHashCode() & 0x7FFFFFFF;
int targetBucket = hashCode & this.mask;
int index = this.Count;
this.Count++;
this.entries[index] = new Entry {
Next = this.buckets[targetBucket], Key = key, Value = value
};
this.buckets[targetBucket] = index;
}
/// <summary>
/// Either get the existing value or create a
/// new one in a single operation.
/// </summary>
/// <param name="key">The key.</param>
/// <returns>The value, possibly freshly created.</returns>
public DD GetOrAdd(DDIndex key)
{
int hashCode = key.GetHashCode() & 0x7FFFFFFF;
int targetBucket = hashCode & this.mask;
for (int i = this.buckets[targetBucket]; i >= 0; i = this.entries[i].Next)
{
if (this.entries[i].Key.Equals(key))
{
var wref = this.entries[i].Value;
if (!wref.TryGetTarget(out DD target))
{
target = new DD(this.manager.Uid, key);
wref.SetTarget(target);
}
return(target);
}
}
int index;
if (this.Count == this.entries.Length)
{
this.Resize();
targetBucket = hashCode & this.mask;
}
index = this.Count;
this.Count++;
var dd = new DD(this.manager.Uid, key);
var value = new WeakReference <DD>(dd);
this.entries[index] = new Entry {
Next = this.buckets[targetBucket], Key = key, Value = value
};
this.buckets[targetBucket] = index;
return(dd);
}
