Coverage for d7a/alp/operations/operation.py: 81%

16 statements  

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1# 

2# Copyright (c) 2015-2021 University of Antwerp, Aloxy NV. 

3# 

4# This file is part of pyd7a. 

5# See https://github.com/Sub-IoT/pyd7a for further info. 

6# 

7# Licensed under the Apache License, Version 2.0 (the "License"); 

8# you may not use this file except in compliance with the License. 

9# You may obtain a copy of the License at 

10# 

11# http://www.apache.org/licenses/LICENSE-2.0 

12# 

13# Unless required by applicable law or agreed to in writing, software 

14# distributed under the License is distributed on an "AS IS" BASIS, 

15# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

16# See the License for the specific language governing permissions and 

17# limitations under the License. 

18# 

19 

20# author: Christophe VG <contact@christophe.vg> 

21# abstract base-class for operations 

22 

23from abc import ABCMeta 

24 

25from d7a.support.schema import Validatable 

26 

27class Operation(Validatable, metaclass=ABCMeta): 

28 def __init__(self, operand=None): 

29 if self.operand_class is None and operand is not None: 

30 raise ValueError("{0} doesn't require an operand.".format( 

31 self.__class__.__name__ 

32 )) 

33 if (operand is None and self.operand_class is not None) or \ 

34 (operand is not None and not isinstance(operand, self.operand_class)): 

35 raise ValueError("{0} requires a {1} operand".format( 

36 self.__class__.__name__, 

37 self.operand_class.__name__ 

38 )) 

39 self.operand = operand 

40 

41 def __iter__(self): 

42 if self.operand: 

43 for byte in self.operand: yield byte 

44 

45 def __str__(self): 

46 s = self.__class__.__name__ 

47 s += ": " + str(self.operand) 

48 return s