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3 ���h � @ sH d Z ddlmZ ddlmZ G dd� dej�Zeej� d�Zdd� Zd S ) aR A database of Python protocol buffer generated symbols. SymbolDatabase is the MessageFactory for messages generated at compile time, and makes it easy to create new instances of a registered type, given only the type's protocol buffer symbol name. Example usage: db = symbol_database.SymbolDatabase() # Register symbols of interest, from one or multiple files. db.RegisterFileDescriptor(my_proto_pb2.DESCRIPTOR) db.RegisterMessage(my_proto_pb2.MyMessage) db.RegisterEnumDescriptor(my_proto_pb2.MyEnum.DESCRIPTOR) # The database can be used as a MessageFactory, to generate types based on # their name: types = db.GetMessages(['my_proto.proto']) my_message_instance = types['MyMessage']() # The database's underlying descriptor pool can be queried, so it's not # necessary to know a type's filename to be able to generate it: filename = db.pool.FindFileContainingSymbol('MyMessage') my_message_instance = db.GetMessages([filename])['MyMessage']() # This functionality is also provided directly via a convenience method: my_message_instance = db.GetSymbol('MyMessage')() � )�descriptor_pool)�message_factoryc @ sH e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dS )�SymbolDatabasez'A database of Python generated symbols.c C s |j }|| j|< | j|� |S )z�Registers the given message type in the local database. Calls to GetSymbol() and GetMessages() will return messages registered here. Args: message: a message.Message, to be registered. Returns: The provided message. )Z DESCRIPTOR�_classes�RegisterMessageDescriptor)�self�message�desc� r �%/usr/lib/python3.6/symbol_database.py�RegisterMessageD s z SymbolDatabase.RegisterMessagec C s | j j|� dS )z�Registers the given message descriptor in the local database. Args: message_descriptor: a descriptor.MessageDescriptor. N)�poolZ AddDescriptor)r Zmessage_descriptorr r r r U s z(SymbolDatabase.RegisterMessageDescriptorc C s | j j|� |S )z�Registers the given enum descriptor in the local database. Args: enum_descriptor: a descriptor.EnumDescriptor. Returns: The provided descriptor. )r ZAddEnumDescriptor)r Zenum_descriptorr r r �RegisterEnumDescriptor] s z%SymbolDatabase.RegisterEnumDescriptorc C s | j j|� dS )z�Registers the given service descriptor in the local database. Args: service_descriptor: a descriptor.ServiceDescriptor. Returns: The provided descriptor. N)r ZAddServiceDescriptor)r Zservice_descriptorr r r �RegisterServiceDescriptori s z(SymbolDatabase.RegisterServiceDescriptorc C s | j j|� dS )z�Registers the given file descriptor in the local database. Args: file_descriptor: a descriptor.FileDescriptor. Returns: The provided descriptor. N)r ZAddFileDescriptor)r Zfile_descriptorr r r �RegisterFileDescriptort s z%SymbolDatabase.RegisterFileDescriptorc C s | j | jj|� S )ax Tries to find a symbol in the local database. Currently, this method only returns message.Message instances, however, if may be extended in future to support other symbol types. Args: symbol: A str, a protocol buffer symbol. Returns: A Python class corresponding to the symbol. Raises: KeyError: if the symbol could not be found. )r r ZFindMessageTypeByName)r Zsymbolr r r � GetSymbol s zSymbolDatabase.GetSymbolc s� � fdd�� i }xl|D ]d}| j j|�}xRt|jj� �D ]@}x:� |�D ].}y| j| ||j< W qD tk rp Y qDX qDW q6W qW |S )a Gets all registered messages from a specified file. Only messages already created and registered will be returned; (this is the case for imported _pb2 modules) But unlike MessageFactory, this version also returns already defined nested messages, but does not register any message extensions. Args: files: The file names to extract messages from. Returns: A dictionary mapping proto names to the message classes. Raises: KeyError: if a file could not be found. c 3 s2 | V x&| j D ] }x� |�D ] }|V q W qW dS )zCWalk a message Descriptor and recursively yields all message names.N)Z nested_types)r �msg_descZ nested_desc)�_GetAllMessagesr r r � s z3SymbolDatabase.GetMessages.<locals>._GetAllMessages)r ZFindFileByName�listZmessage_types_by_name�valuesr Z full_name�KeyError)r �files�result� file_nameZ file_descr r r )r r � GetMessages� s zSymbolDatabase.GetMessagesN) �__name__� __module__� __qualname__�__doc__r r r r r r r r r r r r A s r )r c C s t S )z#Returns the default SymbolDatabase.)�_DEFAULTr r r r �Default� s r N)r Zgoogle.protobufr r ZMessageFactoryr r r r r r r �<module>: s w
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