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comparison planemo/lib/python3.7/site-packages/prov/serializers/__init__.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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0:d30785e31577 1:56ad4e20f292
1 from __future__ import (absolute_import, division, print_function,
2 unicode_literals)
3
4 from prov import Error
5
6 __author__ = 'Trung Dong Huynh'
7 __email__ = 'trungdong@donggiang.com'
8
9 __all__ = [
10 'get'
11 ]
12
13
14 class Serializer(object):
15 """Serializer for PROV documents."""
16
17 document = None
18 """PROV document to serialise."""
19
20 def __init__(self, document=None):
21 """
22 Constructor.
23
24 :param document: Document to serialize.
25 """
26 self.document = document
27
28 def serialize(self, stream, **kwargs):
29 """
30 Abstract method for serializing.
31
32 :param stream: Stream object to serialize the document into.
33 """
34
35 def deserialize(self, stream, **kwargs):
36 """
37 Abstract method for deserializing.
38
39 :param stream: Stream object to deserialize the document from.
40 """
41
42
43 class DoNotExist(Error):
44 """Exception for the case a serializer is not available."""
45 pass
46
47
48 class Registry:
49 """Registry of serializers."""
50
51 serializers = None
52 """Property caching all available serializers in a dict."""
53
54 @staticmethod
55 def load_serializers():
56 """Loads all available serializers into the registry."""
57 from prov.serializers.provjson import ProvJSONSerializer
58 from prov.serializers.provn import ProvNSerializer
59 from prov.serializers.provxml import ProvXMLSerializer
60 from prov.serializers.provrdf import ProvRDFSerializer
61
62 Registry.serializers = {
63 'json': ProvJSONSerializer,
64 'rdf': ProvRDFSerializer,
65 'provn': ProvNSerializer,
66 'xml': ProvXMLSerializer
67 }
68
69
70 def get(format_name):
71 """
72 Returns the serializer class for the specified format. Raises a DoNotExist
73 """
74 # Lazily initialize the list of serializers to avoid cyclic imports
75 if Registry.serializers is None:
76 Registry.load_serializers()
77 try:
78 return Registry.serializers[format_name]
79 except KeyError:
80 raise DoNotExist(
81 'No serializer available for the format "%s"' % format_name
82 )
83
84