X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.db.impl%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fimpl%2Fgraph%2FReadGraphImpl.java;h=2309af76440b10bc2a3e9d336cf2fc4bdfc14819;hp=cc15c1eac9111e063369cadd9c7167b3c843b4a9;hb=e10760b08746837538ad4c2b4c37736aa34c7a47;hpb=868b312e2dd4ab6eac787137a0caeb568f6a7c77

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/ReadGraphImpl.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/ReadGraphImpl.java
index cc15c1eac..2309af764 100644
--- a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/ReadGraphImpl.java
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/ReadGraphImpl.java
@@ -50,6 +50,7 @@ import org.simantics.db.DevelopmentKeys;
 import org.simantics.db.ExternalValueSupport;
 import org.simantics.db.ReadGraph;
 import org.simantics.db.RelationContext;
+import org.simantics.db.RelationInfo;
 import org.simantics.db.Resource;
 import org.simantics.db.Session;
 import org.simantics.db.Statement;
@@ -1849,13 +1850,42 @@ public class ReadGraphImpl implements AsyncReadGraph {
 
 		try {
 
-			Collection<Resource> objects = getObjects(subject, relation);
-			return !objects.isEmpty();
+			RelationInfo rinfo = processor.getRelationInfo(this, relation);
+			Collection<Resource> predicates = getPredicates(subject);
+
+			if (rinfo.isFinal) {
+
+				return predicates.contains(relation);
+
+			} else if (rinfo.isFunctional) {
+
+				try {
+					return processor.getSingleObject(this, subject, relation) != 0;
+				} catch (ManyObjectsForFunctionalRelationException e) {
+					return true;
+				} catch (DatabaseException e) {
+					throw new ServiceException(e);
+				}
+
+			} else {
+
+				for (Resource predicate : getPredicates(subject)) {
+					if (isSubrelationOf(predicate, relation))
+						return true;
+				}
+
+			}
+
+			return false;
 
 		} catch (ServiceException e) {
 
 			throw new ServiceException(e);
 
+		} catch (DatabaseException e) {
+
+			throw new ServiceException(INTERNAL_ERROR_STRING, e);
+
 		} 
 		
 	}