class Checker:#{{{

	'''
		Superclass for validating attributes passed to methods
		Status: TESTED
	'''

	def _check_type(self, attribute, attribute_type):#{{{

		'''
			Validation method
			Input:
			attribute - (unknown) attribute to validate
			attribute_type - (unknown) correct type
			Status: TESTED
		'''

		if attribute == None:
			return
		if not isinstance(attribute, attribute_type):
			_correct = repr(attribute_type.__name__)
			if type(attribute) == types.InstanceType:
				_passed = 'Instance of \'%s\'' % (attribute.__class__.__name__)
			else:
				_passed = repr(type(attribute))
			if type(attribute_type) == types.ClassType:
				_correct = 'instance of %s' % ( _correct)
			_reason = '%s passed instead of %s' %\
				(_passed, _correct)
			raise InvalidArgumentTypeException(_reason)

	#}}}

#}}}