fixed error for mapping of open access color

dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/ResultMapper.java

@@ -56,7 +56,7 @@ public class ResultMapper implements Serializable {
 				out.setGreen(input.getIsGreen());
 				out.setInDiamondJournal(input.getIsInDiamondJournal());
 				out.setPubliclyFunded(input.getPubliclyFunded());
-				out.setOpenAccessColor(OpenAccessColor.valueOf(input.getOpenAccessColor().name()));
+				mapOpenAccessColor(out, input);
 				mapDescription(out, input);
 				mapEmbargo(out, input);
 				mapFormat(out, input);
@@ -86,6 +86,23 @@ public class ResultMapper implements Serializable {
 
 	}
 
+	private static void mapOpenAccessColor(Result out, eu.dnetlib.dhp.schema.oaf.Result input) {
+		if (Optional.ofNullable(input.getOpenAccessColor()).isPresent())
+			switch (input.getOpenAccessColor()) {
+				case bronze:
+					out.setOpenAccessColor(OpenAccessColor.bronze);
+					break;
+				case gold:
+					out.setOpenAccessColor(OpenAccessColor.gold);
+					break;
+				case hybrid:
+					out.setOpenAccessColor(OpenAccessColor.hybrid);
+					break;
+
+			}
+		out.setOpenAccessColor(OpenAccessColor.valueOf(input.getOpenAccessColor().name()));
+	}
+
 	private static void mapContext(Map<String, String> communityMap, CommunityResult out,
 		eu.dnetlib.dhp.schema.oaf.Result input) {
 		Set<String> communities = communityMap.keySet();