/// <summary>
/// Enumerate instances that pass the requested file
/// </summary>
/// <param name="filter">One or more state flags. Any set flag satisfies the filter</param>
public IEnumerable<KeyValuePair<ObjectType, ObjectTypeStates>> EnumerateStates(ObjectTypeStates filter)
{
foreach (KeyValuePair<ObjectType, ObjectTypeStates> pair in myStates)
{
if (0 != (CalculateState(pair.Value) & filter))
{
yield return pair;
}
}
}
/// <summary>
/// Set the specific state flag(s) for this object type and permutation
/// </summary>
/// <returns><see langword="true"/> if the state changes</returns>
private bool SetState(ObjectType objectType, ObjectTypeStates state, uint permutationIdentifier)
{
Dictionary<ObjectType, ObjectTypeStates> dictionary = myStates;
ObjectTypeStates existingState;
if (dictionary.TryGetValue(objectType, out existingState))
{
uint existingPermutationIdentifier = (uint)existingState >> PermutationIdentifierShift; // Note that shift is sufficient without mask, C# 0 fills uint right shift
if (existingPermutationIdentifier != permutationIdentifier)
{
existingState = (ObjectTypeStates)(((uint)existingState & ~(PermutationIdentifierBeforeShiftMask | (uint)ObjectTypeStates.PermutationState)) | (permutationIdentifier << PermutationIdentifierShift) | (uint)(existingState & ObjectTypeStates.PredecidedState));
}
else if ((existingState & state) == state)
{
return false;
}
state |= existingState;
}
else
{
state |= (ObjectTypeStates)(permutationIdentifier << PermutationIdentifierShift);
}
dictionary[objectType] = state;
return true;
}
private ObjectTypeStates CalculateState(ObjectTypeStates storedState)
{
if (((uint)storedState >> PermutationIdentifierShift) == myPermutationIdentifier)
{
return storedState & (ObjectTypeStates.PredecidedState | ObjectTypeStates.PermutationState);
}
return storedState & ObjectTypeStates.PredecidedState;
}
/// <summary>
/// Set the specific state flag(s) for this object type
/// </summary>
private void SetState(ObjectType objectType, ObjectTypeStates state)
{
Dictionary<ObjectType, ObjectTypeStates> dictionary = myStates;
ObjectTypeStates existingState;
if (dictionary.TryGetValue(objectType, out existingState))
{
if ((existingState & state) == state)
{
return;
}
state |= existingState;
}
dictionary[objectType] = state;
}