Package rospy :: Package impl :: Module validators

Source Code for Module rospy.impl.validators

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34   
35  """Internal-use Python decorators for parameter validation""" 
36   
37 -class ParameterInvalid(Exception):
38 """Exception that is raised when a parameter fails validation checks"""
39 - def __init__(self, message):
40 self._message = message
41
42 - def __str__(self):
43 return str(self._message)
44
45 -def non_empty(param_name):
46 """Validator that checks that parameter is not empty""" 47 def validator(param, context): 48 if not param: 49 raise ParameterInvalid("ERROR: parameter [%s] must be specified and non-empty"%param_name) 50 return param
51 return validator 52