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Path: /lib/python2.7/site-packages/google/protobuf/

Viewing File: message_factory.py

# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# http://code.google.com/p/protobuf/
#
# 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 factory class for generating dynamic messages."""

__author__ = 'matthewtoia@google.com (Matt Toia)'

from google.protobuf import descriptor_database
from google.protobuf import descriptor_pool
from google.protobuf import message
from google.protobuf import reflection


class MessageFactory(object):
  """Factory for creating Proto2 messages from descriptors in a pool."""

  def __init__(self):
    """Initializes a new factory."""
    self._classes = {}

  def GetPrototype(self, descriptor):
    """Builds a proto2 message class based on the passed in descriptor.

    Passing a descriptor with a fully qualified name matching a previous
    invocation will cause the same class to be returned.

    Args:
      descriptor: The descriptor to build from.

    Returns:
      A class describing the passed in descriptor.
    """

    if descriptor.full_name not in self._classes:
      result_class = reflection.GeneratedProtocolMessageType(
          descriptor.name.encode('ascii', 'ignore'),
          (message.Message,),
          {'DESCRIPTOR': descriptor})
      self._classes[descriptor.full_name] = result_class
      for field in descriptor.fields:
        if field.message_type:
          self.GetPrototype(field.message_type)
    return self._classes[descriptor.full_name]


_DB = descriptor_database.DescriptorDatabase()
_POOL = descriptor_pool.DescriptorPool(_DB)
_FACTORY = MessageFactory()


def GetMessages(file_protos):
  """Builds a dictionary of all the messages available in a set of files.

  Args:
    file_protos: A sequence of file protos to build messages out of.

  Returns:
    A dictionary containing all the message types in the files mapping the
    fully qualified name to a Message subclass for the descriptor.
  """

  result = {}
  for file_proto in file_protos:
    _DB.Add(file_proto)
  for file_proto in file_protos:
    for desc in _GetAllDescriptors(file_proto.message_type, file_proto.package):
      result[desc.full_name] = _FACTORY.GetPrototype(desc)
  return result


def _GetAllDescriptors(desc_protos, package):
  """Gets all levels of nested message types as a flattened list of descriptors.

  Args:
    desc_protos: The descriptor protos to process.
    package: The package where the protos are defined.

  Yields:
    Each message descriptor for each nested type.
  """

  for desc_proto in desc_protos:
    name = '.'.join((package, desc_proto.name))
    yield _POOL.FindMessageTypeByName(name)
    for nested_desc in _GetAllDescriptors(desc_proto.nested_type, name):
      yield nested_desc