parameters: (self, value, message, field)
docstring: Convert map field value for a message map field.
  
      Args:
        value: A JSON object to convert the map field value.
        message: A protocol message to record the converted data.
        field: The descriptor of the map field to be converted.
  
      Raises:
        ParseError: In case of convert problems.
docstring_summary: Convert map field value for a message map field.
docstring_tokens: Convert map field value for a message map field .
function: def _ConvertMapFieldValue(self, value, message, field):
      """Convert map field value for a message map field.
  
      Args:
        value: A JSON object to convert the map field value.
        message: A protocol message to record the converted data.
        field: The descriptor of the map field to be converted.
  
      Raises:
        ParseError: In case of convert problems.
      """
      if not isinstance(value, dict):
        raise ParseError(
            'Map field {0} must be in a dict which is {1}.'.format(
                field.name, value))
      key_field = field.message_type.fields_by_name['key']
      value_field = field.message_type.fields_by_name['value']
      for key in value:
        key_value = _ConvertScalarFieldValue(key, key_field, True)
        if value_field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
          self.ConvertMessage(value[key], getattr(
              message, field.name)[key_value])
        else:
          getattr(message, field.name)[key_value] = _ConvertScalarFieldValue(
              value[key], value_field)
function_tokens: def _ConvertMapFieldValue ( self , value , message , field ) : if not isinstance ( value , dict ) : raise ParseError ( 'Map field {0} must be in a dict which is {1}.' . format ( field . name , value ) ) key_field = field . message_type . fields_by_name [ 'key' ] value_field = field . message_type . fields_by_name [ 'value' ] for key in value : key_value = _ConvertScalarFieldValue ( key , key_field , True ) if value_field . cpp_type == descriptor . FieldDescriptor . CPPTYPE_MESSAGE : self . ConvertMessage ( value [ key ] , getattr ( message , field . name ) [ key_value ] ) else : getattr ( message , field . name ) [ key_value ] = _ConvertScalarFieldValue ( value [ key ] , value_field )