afs commented on a change in pull request #804:
URL: https://github.com/apache/jena/pull/804#discussion_r499551523
##########
File path:
jena-shacl/src/main/java/org/apache/jena/shacl/engine/SparqlConstraints.java
##########
@@ -91,6 +94,27 @@ public static Constraint parseSparqlConstraint(Graph
shapesGraph, Node shape, No
throw new ShaclParseException("SPARQL parse error:
"+ex.getMessage()+"\n"+qs);
}
}
+
+ /**
+ * Test for zero or one occurrences of a tripel pattern that is expected
to be
+ * Returns false for zero, true for one.
+ * Throws an exception on two or more.
+ */
+ private static boolean absentOrOne(Graph g, Node s, Node p, Node o) {
+ ExtendedIterator<Triple> iter = G.find(g, s, p, null);
+ try {
+ if ( ! iter.hasNext() )
+ return false;
+ iter.next();
+ if ( ! iter.hasNext() )
+ return true;
+ long x = Iter.count(G.find(g, s, p, null));
+ throw new ShaclParseException("More then one (" + x + ") of " +
String.format("(%s %s %s)", s, p, o));
Review comment:
Done
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