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-# Protocol Buffers - Google's data interchange format
-# Copyright 2008 Google Inc. All rights reserved.
-# https://developers.google.com/protocol-buffers/
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-# * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-# * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-# * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Provides a container for DescriptorProtos."""
-
-__author__ = 'matthewtoia@google.com (Matt Toia)'
-
-
-class Error(Exception):
- pass
-
-
-class DescriptorDatabaseConflictingDefinitionError(Error):
- """Raised when a proto is added with the same name & different descriptor."""
-
-
-class DescriptorDatabase(object):
- """A container accepting FileDescriptorProtos and maps DescriptorProtos."""
-
- def __init__(self):
- self._file_desc_protos_by_file = {}
- self._file_desc_protos_by_symbol = {}
-
- def Add(self, file_desc_proto):
- """Adds the FileDescriptorProto and its types to this database.
-
- Args:
- file_desc_proto: The FileDescriptorProto to add.
- Raises:
- DescriptorDatabaseException: if an attempt is made to add a proto
- with the same name but different definition than an exisiting
- proto in the database.
- """
- proto_name = file_desc_proto.name
- if proto_name not in self._file_desc_protos_by_file:
- self._file_desc_protos_by_file[proto_name] = file_desc_proto
- elif self._file_desc_protos_by_file[proto_name] != file_desc_proto:
- raise DescriptorDatabaseConflictingDefinitionError(
- '%s already added, but with different descriptor.' % proto_name)
-
- # Add the top-level Message, Enum and Extension descriptors to the index.
- package = file_desc_proto.package
- for message in file_desc_proto.message_type:
- self._file_desc_protos_by_symbol.update(
- (name, file_desc_proto) for name in _ExtractSymbols(message, package))
- for enum in file_desc_proto.enum_type:
- self._file_desc_protos_by_symbol[
- '.'.join((package, enum.name))] = file_desc_proto
- for extension in file_desc_proto.extension:
- self._file_desc_protos_by_symbol[
- '.'.join((package, extension.name))] = file_desc_proto
-
- def FindFileByName(self, name):
- """Finds the file descriptor proto by file name.
-
- Typically the file name is a relative path ending to a .proto file. The
- proto with the given name will have to have been added to this database
- using the Add method or else an error will be raised.
-
- Args:
- name: The file name to find.
-
- Returns:
- The file descriptor proto matching the name.
-
- Raises:
- KeyError if no file by the given name was added.
- """
-
- return self._file_desc_protos_by_file[name]
-
- def FindFileContainingSymbol(self, symbol):
- """Finds the file descriptor proto containing the specified symbol.
-
- The symbol should be a fully qualified name including the file descriptor's
- package and any containing messages. Some examples:
-
- 'some.package.name.Message'
- 'some.package.name.Message.NestedEnum'
-
- The file descriptor proto containing the specified symbol must be added to
- this database using the Add method or else an error will be raised.
-
- Args:
- symbol: The fully qualified symbol name.
-
- Returns:
- The file descriptor proto containing the symbol.
-
- Raises:
- KeyError if no file contains the specified symbol.
- """
-
- return self._file_desc_protos_by_symbol[symbol]
-
-
-def _ExtractSymbols(desc_proto, package):
- """Pulls out all the symbols from a descriptor proto.
-
- Args:
- desc_proto: The proto to extract symbols from.
- package: The package containing the descriptor type.
-
- Yields:
- The fully qualified name found in the descriptor.
- """
-
- message_name = '.'.join((package, desc_proto.name))
- yield message_name
- for nested_type in desc_proto.nested_type:
- for symbol in _ExtractSymbols(nested_type, message_name):
- yield symbol
- for enum_type in desc_proto.enum_type:
- yield '.'.join((message_name, enum_type.name))