X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.objmap2%2Fsrc%2Forg%2Fsimantics%2Fobjmap%2Fgraph%2Frules%2FMappedElementRule.java;h=251895ad72a1aedc7aac9966b5f51b5bc83aa08b;hp=9761f555568fbc6b3827eaa2d6cd7ee77e9ad884;hb=0cb9829cf7fbee31bbc952c6313b01e195e8d010;hpb=6838557ccc94ba62e167fe3da59e04629f5cf9f6

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementRule.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementRule.java
index 9761f5555..251895ad7 100644
--- a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementRule.java
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementRule.java
@@ -11,6 +11,8 @@
  *******************************************************************************/
 package org.simantics.objmap.graph.rules;
 
+import java.util.Objects;
+
 import org.simantics.db.ReadGraph;
 import org.simantics.db.WriteGraph;
 import org.simantics.objmap.backward.IBackwardMapping;
@@ -61,10 +63,19 @@ public class MappedElementRule<Domain, Range> implements IBidirectionalMappingRu
         return rangeAccessor.set(rangeElement, mappedValue);
 	}	
 	
+	@Override
+	public boolean checkChanges(ReadGraph g, IForwardMapping<Domain, Range> map, Domain domainElement, Range rangeElement) throws MappingException {
+	    Domain value = domainAccessor.get(g, domainElement);
+	    Range mappedValue = value == null ? null : map.map(g, value);
+	    return mappedValue != rangeAccessor.get(rangeElement);
+	}
+	
+    @Override
 	public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
 		updateDomain(g, map, domainElement, rangeElement);
 	};
 	
+    @Override
 	public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
 		updateRange(g, map, domainElement, rangeElement);
 	};