public void Delete(int id)
{
if (!aliveEntities.Remove(id))
{
throw new InvalidOperationException($"entity {id} not alive");
}
// Notify events.
deletedEvents.Publish(id, e => e(id));
// Delete and unpair children.
if (entityChildren.TryGetValue(id, out var children))
{
foreach (var childId in children)
{
Unpair(id, childId);
Delete(childId);
}
entityChildren.Remove(id);
}
// Unpair from parents.
if (entityParents.TryGetValue(id, out var parents))
{
foreach (var parentId in parents)
{
Unpair(parentId, id);
}
parents.Remove(id);
}
// Clear rest of the state and return id to pool.
deletedEvents.Delete(id);
unpairedFromChildEvents.Delete(id);
unpairedFromParentEvents.Delete(id);
madeParentOfEvents.Delete(id);
madeChildOfEvents.Delete(id);
entityTags.Remove(id);
entityAnnotations.Remove(id);
freeEntities.Return(id);
}