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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/serializers/trix.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 rdflib.serializer import Serializer
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2 from rdflib.plugins.serializers.xmlwriter import XMLWriter
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3
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4 from rdflib.term import URIRef, Literal, BNode
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5 from rdflib.namespace import Namespace
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6
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7 from rdflib.graph import Graph, ConjunctiveGraph
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8
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9 from rdflib.py3compat import b
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10
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11 __all__ = ['TriXSerializer']
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12
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13 ## TODO: MOve this somewhere central
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14 TRIXNS = Namespace("http://www.w3.org/2004/03/trix/trix-1/")
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15 XMLNS = Namespace("http://www.w3.org/XML/1998/namespace")
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16
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17
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18 class TriXSerializer(Serializer):
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19 def __init__(self, store):
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20 super(TriXSerializer, self).__init__(store)
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21 if not store.context_aware:
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22 raise Exception(
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23 "TriX serialization only makes sense for context-aware stores")
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24
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25 def serialize(self, stream, base=None, encoding=None, **args):
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26
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27 nm = self.store.namespace_manager
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28
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29 self.writer = XMLWriter(stream, nm, encoding, extra_ns={"": TRIXNS})
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30
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31 self.writer.push(TRIXNS["TriX"])
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32 self.writer.namespaces()
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33
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34 if isinstance(self.store, ConjunctiveGraph):
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35 for subgraph in self.store.contexts():
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36 self._writeGraph(subgraph)
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37 elif isinstance(self.store, Graph):
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38 self._writeGraph(self.store)
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39 else:
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40 raise Exception("Unknown graph type: " + type(self.store))
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41
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42 self.writer.pop()
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43 stream.write(b("\n"))
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44
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45 def _writeGraph(self, graph):
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46 self.writer.push(TRIXNS["graph"])
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47 if isinstance(graph.identifier, URIRef):
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48 self.writer.element(
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49 TRIXNS["uri"], content=str(graph.identifier))
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50
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51 for triple in graph.triples((None, None, None)):
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52 self._writeTriple(triple)
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53 self.writer.pop()
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54
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55 def _writeTriple(self, triple):
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56 self.writer.push(TRIXNS["triple"])
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57 for component in triple:
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58 if isinstance(component, URIRef):
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59 self.writer.element(TRIXNS["uri"],
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60 content=str(component))
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61 elif isinstance(component, BNode):
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62 self.writer.element(TRIXNS["id"],
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63 content=str(component))
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64 elif isinstance(component, Literal):
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65 if component.datatype:
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66 self.writer.element(TRIXNS["typedLiteral"],
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67 content=str(component),
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68 attributes={TRIXNS["datatype"]:
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69 str(
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70 component.datatype)})
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71 elif component.language:
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72 self.writer.element(TRIXNS["plainLiteral"],
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73 content=str(component),
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74 attributes={XMLNS["lang"]:
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75 str(
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76 component.language)})
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77 else:
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78 self.writer.element(TRIXNS["plainLiteral"],
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79 content=str(component))
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80 self.writer.pop()