Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/google/protobuf/internal/extension_dict.py: 22%

1# Protocol Buffers - Google's data interchange format 

2# Copyright 2008 Google Inc. All rights reserved. 

3# https://developers.google.com/protocol-buffers/ 

4# 

5# Redistribution and use in source and binary forms, with or without 

6# modification, are permitted provided that the following conditions are 

7# met: 

8# 

9# * Redistributions of source code must retain the above copyright 

10# notice, this list of conditions and the following disclaimer. 

11# * Redistributions in binary form must reproduce the above 

12# copyright notice, this list of conditions and the following disclaimer 

13# in the documentation and/or other materials provided with the 

14# distribution. 

15# * Neither the name of Google Inc. nor the names of its 

16# contributors may be used to endorse or promote products derived from 

17# this software without specific prior written permission. 

18# 

19# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 

20# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 

21# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 

22# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 

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24# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 

25# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 

26# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 

27# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 

28# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 

29# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

30 

31"""Contains _ExtensionDict class to represent extensions. 

32""" 

33 

34from google.protobuf.internal import type_checkers 

35from google.protobuf.descriptor import FieldDescriptor 

36 

37 

38def _VerifyExtensionHandle(message, extension_handle): 

39 """Verify that the given extension handle is valid.""" 

40 

41 if not isinstance(extension_handle, FieldDescriptor): 

42 raise KeyError('HasExtension() expects an extension handle, got: %s' % 

43 extension_handle) 

44 

45 if not extension_handle.is_extension: 

46 raise KeyError('"%s" is not an extension.' % extension_handle.full_name) 

47 

48 if not extension_handle.containing_type: 

49 raise KeyError('"%s" is missing a containing_type.' 

50 % extension_handle.full_name) 

51 

52 if extension_handle.containing_type is not message.DESCRIPTOR: 

53 raise KeyError('Extension "%s" extends message type "%s", but this ' 

54 'message is of type "%s".' % 

55 (extension_handle.full_name, 

56 extension_handle.containing_type.full_name, 

57 message.DESCRIPTOR.full_name)) 

58 

59 

60# TODO(robinson): Unify error handling of "unknown extension" crap. 

61# TODO(robinson): Support iteritems()-style iteration over all 

62# extensions with the "has" bits turned on? 

63class _ExtensionDict(object): 

64 

65 """Dict-like container for Extension fields on proto instances. 

66 

67 Note that in all cases we expect extension handles to be 

68 FieldDescriptors. 

69 """ 

70 

71 def __init__(self, extended_message): 

72 """ 

73 Args: 

74 extended_message: Message instance for which we are the Extensions dict. 

75 """ 

76 self._extended_message = extended_message 

77 

78 def __getitem__(self, extension_handle): 

79 """Returns the current value of the given extension handle.""" 

80 

81 _VerifyExtensionHandle(self._extended_message, extension_handle) 

82 

83 result = self._extended_message._fields.get(extension_handle) 

84 if result is not None: 

85 return result 

86 

87 if extension_handle.label == FieldDescriptor.LABEL_REPEATED: 

88 result = extension_handle._default_constructor(self._extended_message) 

89 elif extension_handle.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE: 

90 message_type = extension_handle.message_type 

91 if not hasattr(message_type, '_concrete_class'): 

92 # pylint: disable=g-import-not-at-top 

93 from google.protobuf import message_factory 

94 message_factory.GetMessageClass(message_type) 

95 assert getattr(extension_handle.message_type, '_concrete_class', None), ( 

96 'Uninitialized concrete class found for field %r (message type %r)' 

97 % (extension_handle.full_name, 

98 extension_handle.message_type.full_name)) 

99 result = extension_handle.message_type._concrete_class() 

100 try: 

101 result._SetListener(self._extended_message._listener_for_children) 

102 except ReferenceError: 

103 pass 

104 else: 

105 # Singular scalar -- just return the default without inserting into the 

106 # dict. 

107 return extension_handle.default_value 

108 

109 # Atomically check if another thread has preempted us and, if not, swap 

110 # in the new object we just created. If someone has preempted us, we 

111 # take that object and discard ours. 

112 # WARNING: We are relying on setdefault() being atomic. This is true 

113 # in CPython but we haven't investigated others. This warning appears 

114 # in several other locations in this file. 

115 result = self._extended_message._fields.setdefault( 

116 extension_handle, result) 

117 

118 return result 

119 

120 def __eq__(self, other): 

121 if not isinstance(other, self.__class__): 

122 return False 

123 

124 my_fields = self._extended_message.ListFields() 

125 other_fields = other._extended_message.ListFields() 

126 

127 # Get rid of non-extension fields. 

128 my_fields = [field for field in my_fields if field.is_extension] 

129 other_fields = [field for field in other_fields if field.is_extension] 

130 

131 return my_fields == other_fields 

132 

133 def __ne__(self, other): 

134 return not self == other 

135 

136 def __len__(self): 

137 fields = self._extended_message.ListFields() 

138 # Get rid of non-extension fields. 

139 extension_fields = [field for field in fields if field[0].is_extension] 

140 return len(extension_fields) 

141 

142 def __hash__(self): 

143 raise TypeError('unhashable object') 

144 

145 # Note that this is only meaningful for non-repeated, scalar extension 

146 # fields. Note also that we may have to call _Modified() when we do 

147 # successfully set a field this way, to set any necessary "has" bits in the 

148 # ancestors of the extended message. 

149 def __setitem__(self, extension_handle, value): 

150 """If extension_handle specifies a non-repeated, scalar extension 

151 field, sets the value of that field. 

152 """ 

153 

154 _VerifyExtensionHandle(self._extended_message, extension_handle) 

155 

156 if (extension_handle.label == FieldDescriptor.LABEL_REPEATED or 

157 extension_handle.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE): 

158 raise TypeError( 

159 'Cannot assign to extension "%s" because it is a repeated or ' 

160 'composite type.' % extension_handle.full_name) 

161 

162 # It's slightly wasteful to lookup the type checker each time, 

163 # but we expect this to be a vanishingly uncommon case anyway. 

164 type_checker = type_checkers.GetTypeChecker(extension_handle) 

165 # pylint: disable=protected-access 

166 self._extended_message._fields[extension_handle] = ( 

167 type_checker.CheckValue(value)) 

168 self._extended_message._Modified() 

169 

170 def __delitem__(self, extension_handle): 

171 self._extended_message.ClearExtension(extension_handle) 

172 

173 def _FindExtensionByName(self, name): 

174 """Tries to find a known extension with the specified name. 

175 

176 Args: 

177 name: Extension full name. 

178 

179 Returns: 

180 Extension field descriptor. 

181 """ 

182 return self._extended_message._extensions_by_name.get(name, None) 

183 

184 def _FindExtensionByNumber(self, number): 

185 """Tries to find a known extension with the field number. 

186 

187 Args: 

188 number: Extension field number. 

189 

190 Returns: 

191 Extension field descriptor. 

192 """ 

193 return self._extended_message._extensions_by_number.get(number, None) 

194 

195 def __iter__(self): 

196 # Return a generator over the populated extension fields 

197 return (f[0] for f in self._extended_message.ListFields() 

198 if f[0].is_extension) 

199 

200 def __contains__(self, extension_handle): 

201 _VerifyExtensionHandle(self._extended_message, extension_handle) 

202 

203 if extension_handle not in self._extended_message._fields: 

204 return False 

205 

206 if extension_handle.label == FieldDescriptor.LABEL_REPEATED: 

207 return bool(self._extended_message._fields.get(extension_handle)) 

208 

209 if extension_handle.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE: 

210 value = self._extended_message._fields.get(extension_handle) 

211 # pylint: disable=protected-access 

212 return value is not None and value._is_present_in_parent 

213 

214 return True