UaJSONDecoder.dict_to_object() - Code Metrics - Inspection of "Implement Event History" - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#172)

unknown

created 2016-05-02 02:20 UTC

UaJSONDecoder.dict_to_object() A

↳ Parent: UaJSONDecoder

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	4
c	1
b	0
f	0
dl	0
loc	13
rs	9.2

"""
JSON encoder / decoder for OPC UA objects
Not yet used anywhere, but could be useful in the future for sending data to
external system such as a web based app
"""

from json import JSONEncoder, JSONDecoder

from opcua import ua
from datetime import datetime

# FIXME this JSON utility is not finished, should implement encoding / decoding of useful UA types


class UaJSONEncoder(JSONEncoder):
    """
    JSON encoder utility which is extended to handle opc ua objects
    """
    def default(self, o):
        if isinstance(o, datetime):
            return {
                '__type__': 'datetime',
                'year': o.year,
                'month': o.month,
                'day': o.day,
                'hour': o.hour,
                'minute': o.minute,
                'second': o.second,
                'microsecond': o.microsecond
            }
        elif isinstance(o, ua.NodeId):
            return {
                '__type__': 'NodeId',
                'Identifier': o.Identifier,
                'NamespaceIndex': o.NamespaceIndex,
            }
        else:
            return JSONEncoder.default(self, o)


class UaJSONDecoder(JSONDecoder):
    """
    JSON decoder utility which is extended to handle opc ua objects
    """
    def __init__(self):
        JSONDecoder.__init__(self, object_hook=self.dict_to_object)

    def dict_to_object(self, d):
        if '__type__' not in d:
            return d

        type = d.pop('__type__')
        if type == 'datetime':
            return datetime(**d)
        elif type == 'NodeId':
            return ua.NodeId(**d)
        else:
            #  decoder subclass can't handle this object type; put it back in the dict so super throws TypeError
            d['__type__'] = type
            return d


1			"""
2			JSON encoder / decoder for OPC UA objects
3			Not yet used anywhere, but could be useful in the future for sending data to
4			external system such as a web based app
5			"""
6
7			from json import JSONEncoder, JSONDecoder
8
9			from opcua import ua
10			from datetime import datetime
11
12			# FIXME this JSON utility is not finished, should implement encoding / decoding of useful UA types
13
14
15			class UaJSONEncoder(JSONEncoder):
16			"""
17			JSON encoder utility which is extended to handle opc ua objects
18			"""
19			def default(self, o):
20			if isinstance(o, datetime):
21			return {
22			'__type__': 'datetime',
23			'year': o.year,
24			'month': o.month,
25			'day': o.day,
26			'hour': o.hour,
27			'minute': o.minute,
28			'second': o.second,
29			'microsecond': o.microsecond
30			}
31			elif isinstance(o, ua.NodeId):
32			return {
33			'__type__': 'NodeId',
34			'Identifier': o.Identifier,
35			'NamespaceIndex': o.NamespaceIndex,
36			}
37			else:
38			return JSONEncoder.default(self, o)
39
40
41			class UaJSONDecoder(JSONDecoder):
42			"""
43			JSON decoder utility which is extended to handle opc ua objects
44			"""
45			def __init__(self):
46			JSONDecoder.__init__(self, object_hook=self.dict_to_object)
47
48			def dict_to_object(self, d):
49			if '__type__' not in d:
50			return d
51
52			type = d.pop('__type__')
53			if type == 'datetime':
54			return datetime(**d)
55			elif type == 'NodeId':
56			return ua.NodeId(**d)
57			else:
58			# decoder subclass can't handle this object type; put it back in the dict so super throws TypeError
59			d['__type__'] = type
60			return d
61

FreeOpcUa / python-opcua

Pull Request — master (#172)

UaJSONDecoder.dict_to_object() A

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