public TComponentGroup GetComponentGroup <TComponentGroup>() where TComponentGroup : class, IComponentGroup
{
ComponentGroupKey groupKey = new ComponentGroupKey(typeof(TComponentGroup).GetGenericArguments());
IComponentGroup group;
if (componentGroups.TryGetValue(groupKey, out group))
{
return((TComponentGroup)group);
}
TComponentGroup componentGroup = (TComponentGroup)Activator.CreateInstance(typeof(TComponentGroup), this);
foreach (var componentTypes in entityComponentTypes)
{
Entity entity = componentTypes.Key;
HashSet <Type> entityComponents = componentTypes.Value;
if (IsComponentTypesMatchGroup(entityComponents, groupKey))
{
componentGroup.AddEntity(entity);
}
}
componentGroups.Add(groupKey, componentGroup);
return(componentGroup);
}
private bool IsComponentTypesMatchGroup(HashSet <Type> componentTypes, ComponentGroupKey groupKey)
{
foreach (Type componentType in groupKey.Types)
{
if (!componentTypes.Contains(componentType))
{
return(false);
}
}
return(true);
}
