# HG changeset patch
# User Drew Perttula <drewp@bigasterisk.com>
# Date 1402816029 0
# Node ID eccb02a704cf6525c8d48aca9ac0398fca7bd606
# Parent  c78a8f8a08ecb6b5a7d6bea8c7bddfd75587a266
big speedup on graph.contains
Ignore-this: 53c970be29bac62467052ba11cedce53

diff -r c78a8f8a08ec -r eccb02a704cf light9/rdfdb/rdflibpatch.py
--- a/light9/rdfdb/rdflibpatch.py	Sun Jun 15 06:50:04 2014 +0000
+++ b/light9/rdfdb/rdflibpatch.py	Sun Jun 15 07:07:09 2014 +0000
@@ -53,7 +53,11 @@
     c is just a URIRef.
     Workaround for https://github.com/RDFLib/rdflib/issues/398
     """
-    return (spoc[:3] + (Graph(identifier=spoc[3]),)) in graph.quads()
+    spoi = spoc[:3] + (Graph(identifier=spoc[3]),)
+    if spoi not in graph:
+        # this is a huge speedup, avoid many whole-graph scans
+        return False
+    return spoi in graph.quads()
 
 
 def graphFromQuads(q):