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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/sparql/processor.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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2 """
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3 Code for tying SPARQL Engine into RDFLib
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5 These should be automatically registered with RDFLib
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6
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7 """
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10 from rdflib.query import Processor, Result, UpdateProcessor
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11
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12 from rdflib.plugins.sparql.sparql import Query
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13
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14 from rdflib.plugins.sparql.parser import parseQuery, parseUpdate
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15 from rdflib.plugins.sparql.algebra import translateQuery, translateUpdate
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16
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17 from rdflib.plugins.sparql.evaluate import evalQuery
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18 from rdflib.plugins.sparql.update import evalUpdate
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21 def prepareQuery(queryString, initNs={}, base=None):
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22 """
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23 Parse and translate a SPARQL Query
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24 """
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25 ret = translateQuery(parseQuery(queryString), base, initNs)
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26 ret._original_args = (queryString, initNs, base)
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27 return ret
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30 def processUpdate(graph, updateString, initBindings={}, initNs={}, base=None):
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31 """
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32 Process a SPARQL Update Request
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33 returns Nothing on success or raises Exceptions on error
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34 """
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35 evalUpdate(graph, translateUpdate(
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36 parseUpdate(updateString), base, initNs), initBindings)
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38
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39 class SPARQLResult(Result):
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41 def __init__(self, res):
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42 Result.__init__(self, res["type_"])
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43 self.vars = res.get("vars_")
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44 self.bindings = res.get("bindings")
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45 self.askAnswer = res.get("askAnswer")
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46 self.graph = res.get("graph")
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47
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48 class SPARQLUpdateProcessor(UpdateProcessor):
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49 def __init__(self, graph):
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50 self.graph = graph
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51
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52 def update(self, strOrQuery, initBindings={}, initNs={}):
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53 if isinstance(strOrQuery, str):
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54 strOrQuery=translateUpdate(parseUpdate(strOrQuery), initNs=initNs)
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55
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56 return evalUpdate(self.graph, strOrQuery, initBindings)
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59 class SPARQLProcessor(Processor):
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61 def __init__(self, graph):
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62 self.graph = graph
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63
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64 def query(
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65 self, strOrQuery, initBindings={},
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66 initNs={}, base=None, DEBUG=False):
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67 """
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68 Evaluate a query with the given initial bindings, and initial
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69 namespaces. The given base is used to resolve relative URIs in
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70 the query and will be overridden by any BASE given in the query.
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71 """
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72
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73 if not isinstance(strOrQuery, Query):
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74 parsetree = parseQuery(strOrQuery)
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75 query = translateQuery(parsetree, base, initNs)
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76 else:
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77 query = strOrQuery
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78
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79 return evalQuery(self.graph, query, initBindings, base)