# Protocol Buffers - Google's data interchange format
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"""Protocol message implementation hooks for C++ implementation.

Contains helper functions used to create protocol message classes from
Descriptor objects at runtime backed by the protocol buffer C++ API.
"""

__author__ = 'tibell@google.com (Johan Tibell)'

from google.protobuf.pyext import _message
from google.protobuf import message


def NewMessage(bases, message_descriptor, dictionary):
  """Creates a new protocol message *class*."""
  new_bases = []
  for base in bases:
    if base is message.Message:
      # _message.Message must come before message.Message as it
      # overrides methods in that class.
      new_bases.append(_message.Message)
    new_bases.append(base)
  return tuple(new_bases)


def InitMessage(message_descriptor, cls):
  """Constructs a new message instance (called before instance's __init__)."""

  def SubInit(self, **kwargs):
    super(cls, self).__init__(message_descriptor, **kwargs)
  cls.__init__ = SubInit
  cls.AddDescriptors(message_descriptor)