o <ºir ã@s8dZddlmZmZdedefdd„ZGdd„dƒZd S) a This is a singleton metaclass that can be used to cache and reuse existing objects. In the Iceberg codebase we have a lot of objects that are stateless (for example Types such as StringType, BooleanType etc). FixedTypes have arguments (eg. Fixed[22]) that we also make part of the key when caching the newly created object. The Singleton uses a metaclass which essentially defines a new type. When the Type gets created, it will first evaluate the `__call__` method with all the arguments. If we already initialized a class earlier, we'll just return it. More information on metaclasses: https://docs.python.org/3/reference/datamodel.html#metaclasses é)ÚAnyÚClassVarÚelementÚreturncCs<t|tƒrtdd„| ¡DƒƒSt|tƒrttt|ƒƒS|S)Ncss$|] \}}t|ƒt|ƒfVqdS©N)Ú_convert_to_hashable_type)Ú.0ÚkÚv©rúV/home/ubuntu/veenaModal/venv/lib/python3.10/site-packages/pyiceberg/utils/singleton.pyÚ $s€"z,_convert_to_hashable_type..)Ú isinstanceÚdictÚtupleÚitemsÚlistÚmapr)rrrrr"s rcsHeZdZUiZeeed<‡fdd„Zdeee fde fdd„Z ‡ZS)Ú SingletonÚ _instancescs8|t|ƒt|ƒf}||jvrtƒ |¡|j|<|j|Sr)rrrÚsuperÚ__new__)ÚclsÚargsÚkwargsÚkey©Ú __class__rrr-s zSingleton.__new__ÚmemorcCs|S)a¿ Prevent deep copy operations for singletons. The IcebergRootModel inherits from Pydantic RootModel, which has its own implementation of deepcopy. When deepcopy runs, it calls the RootModel __deepcopy__ method and ignores that it's a Singleton. To handle this, the order of inheritance is adjusted and a __deepcopy__ method is implemented for singletons that simply returns itself. r)ÚselfrrrrÚ__deepcopy__3szSingleton.__deepcopy__)Ú__name__Ú __module__Ú__qualname__rrrÚ__annotations__rÚintrr Ú __classcell__rrrrr*s "rN)Ú__doc__ÚtypingrrrrrrrrÚs