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