Executor: handle defaultGraph properly

Author: DylanVanAssche

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 - Better handle unsupported reference formulation (See [issue 247](https://github.com/RMLio/rmlmapper-java/issues/247))
+- Graph Maps with default graph must not be ignored (See [issue 252](https://github.com/RMLio/rmlmapper-java/issues/252))
 
 ## [7.3.2] - 2025-03-04
 

src/main/java/be/ugent/rml/Executor.java

@@ -372,7 +372,13 @@ private List<PredicateObjectGraph> combineMultiplePOGs(List<ProvenancedTerm> pre
         predicates.forEach(
                 p -> objects.forEach(
                         o -> graphs.forEach(
-                                g -> results.add(new PredicateObjectGraph(p, o, g))
+                                g -> {
+                                    if (g.getTerm().equals(new NamedNode(NAMESPACES.RML2 + "defaultGraph"))) {
+                                        results.add(new PredicateObjectGraph(p, o, null));
+                                    } else {
+                                        results.add(new PredicateObjectGraph(p, o, g));
+                                    }
+                                }
                         )
                 )
         );
@@ -475,10 +481,8 @@ private void generatePredicateObjectsForSubjects(final List<ProvenancedTerm> sub
                         TermGenerator pogGraphGenerator = pogGraphMappingInfo.getTermGenerator();
                         if (pogGraphGenerator != null) {
                             pogGraphGenerator.generate(record).forEach(term -> {
-                                if (!term.equals(new NamedNode(NAMESPACES.RML2 + "defaultGraph"))) {
-                                    List<Term> graphTargets = getAllTargets(pogGraphMappingInfo, record);
-                                    poGraphs.add(new ProvenancedTerm(term, null, graphTargets));
-                                }
+                                List<Term> graphTargets = getAllTargets(pogGraphMappingInfo, record);
+                                poGraphs.add(new ProvenancedTerm(term, null, graphTargets));
                             });
                         }
                     }