// When de-serializing or creating this component, we want to either restore our serialized GUID
// or create a new one.
void CreateGuid()
{
// if our serialized data is invalid, then we are a new object and need a new GUID
if (serializedGuid == null || serializedGuid.Length != 16)
{
#if UNITY_EDITOR
// if in editor, make sure we aren't a prefab of some kind
if (IsAssetOnDisk())
{
return;
}
Undo.RecordObject(this, "Added GUID");
#endif
guid = Guid.NewGuid();
serializedGuid = guid.ToByteArray();
#if UNITY_EDITOR
// If we are creating a new GUID for a prefab instance of a prefab, but we have somehow lost our prefab connection
// force a save of the modified prefab instance properties
if (PrefabUtility.IsPartOfNonAssetPrefabInstance(this))
{
PrefabUtility.RecordPrefabInstancePropertyModifications(this);
}
#endif
}
else if (guid == Guid.Empty)
{
// otherwise, we should set our system guid to our serialized guid
guid = new Guid(serializedGuid);
}
// register with the GUID Manager so that other components can access this
if (guid != Guid.Empty)
{
if (!GuidManagerSingleton.Add(guid, gameObject))
{
// if registration fails, we probably have a duplicate or invalid GUID, get us a new one.
RegenerateGuid();
}
}
}
/// <summary>
/// Sets guid. Be careful with this method. It should be called only in specific cases.
/// </summary>
/// <param name="value">New guid</param>
public void SetGuid(Guid value)
{
cachedStringGuid = null;
Guid?oldGuid = null;
if (IsGuidAssigned())
{
oldGuid = guid;
GuidManagerSingleton.Remove(guid);
}
guid = value;
if (!GuidManagerSingleton.Add(guid, gameObject))
{
Debug.LogError($"Trying to set invalid guid: {value}. Previous guid restored.");
if (oldGuid.HasValue)
{
guid = oldGuid.Value;
GuidManagerSingleton.Add(guid, gameObject);
}
}
}