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49
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1 import logging
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2 from rdflib import URIRef, ConjunctiveGraph
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3 log = logging.getLogger()
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48
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4
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5 def graphWithoutMetadata(g, ignorePredicates=[]):
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6 """
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7 graph filter that removes any statements whose subjects are
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8 contexts in the graph and also any statements with the given
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9 predicates
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10 """
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11 ctxs = map(URIRef, set(g.contexts())) # weird they turned to strings
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12
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13 out = ConjunctiveGraph()
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14 for stmt in g.quads((None, None, None)):
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15 if stmt[0] not in ctxs and stmt[1] not in ignorePredicates:
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16 out.addN([stmt])
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17 return out
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18
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19 def graphEqual(a, b, ignorePredicates=[]):
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20 """
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21 compare graphs, omitting any metadata statements about contexts
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22 (especially modification times) and also any statements using the
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23 given predicates
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24 """
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25 stmtsA = set(graphWithoutMetadata(a, ignorePredicates))
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26 stmtsB = set(graphWithoutMetadata(b, ignorePredicates))
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27 if stmtsA == stmtsB:
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28 return True
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29
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30 if log.getEffectiveLevel() <= logging.INFO:
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31 lost = stmtsA - stmtsB
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32 if lost:
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33 log.info("lost statements:")
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34 for s in lost:
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35 log.info(" %s", s)
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36 new = stmtsB - stmtsA
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37 if new:
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38 log.info("new statements:")
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39 for s in new:
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40 log.info(" %s", s)
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41 return False
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