1# Protocol Buffers - Google's data interchange format
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3# http://code.google.com/p/protobuf/
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30
31"""A simple wrapper around enum types to expose utility functions.
32
33Instances are created as properties with the same name as the enum they wrap
34on proto classes.  For usage, see:
35  reflection_test.py
36"""
37
38__author__ = 'rabsatt@google.com (Kevin Rabsatt)'
39
40
41class EnumTypeWrapper(object):
42  """A utility for finding the names of enum values."""
43
44  DESCRIPTOR = None
45
46  def __init__(self, enum_type):
47    """Inits EnumTypeWrapper with an EnumDescriptor."""
48    self._enum_type = enum_type
49    self.DESCRIPTOR = enum_type;
50
51  def Name(self, number):
52    """Returns a string containing the name of an enum value."""
53    if number in self._enum_type.values_by_number:
54      return self._enum_type.values_by_number[number].name
55    raise ValueError('Enum %s has no name defined for value %d' % (
56        self._enum_type.name, number))
57
58  def Value(self, name):
59    """Returns the value coresponding to the given enum name."""
60    if name in self._enum_type.values_by_name:
61      return self._enum_type.values_by_name[name].number
62    raise ValueError('Enum %s has no value defined for name %s' % (
63        self._enum_type.name, name))
64
65  def keys(self):
66    """Return a list of the string names in the enum.
67
68    These are returned in the order they were defined in the .proto file.
69    """
70
71    return [value_descriptor.name
72            for value_descriptor in self._enum_type.values]
73
74  def values(self):
75    """Return a list of the integer values in the enum.
76
77    These are returned in the order they were defined in the .proto file.
78    """
79
80    return [value_descriptor.number
81            for value_descriptor in self._enum_type.values]
82
83  def items(self):
84    """Return a list of the (name, value) pairs of the enum.
85
86    These are returned in the order they were defined in the .proto file.
87    """
88    return [(value_descriptor.name, value_descriptor.number)
89            for value_descriptor in self._enum_type.values]
90