SONAR-17287 Fix conversion of flow types

server/sonar-ce-task-projectanalysis/src/main/java/org/sonar/ce/task/projectanalysis/issue/TrackerRawInputFactory.java

@@ -263,8 +263,10 @@ public class TrackerRawInputFactory {
           return Optional.of(DbIssues.FlowType.DATA);
         case EXECUTION:
           return Optional.of(DbIssues.FlowType.EXECUTION);
-        default:
+        case UNDEFINED:
           return Optional.empty();
+        default:
+          throw new IllegalArgumentException("Unrecognized type: " + flowType);
       }
     }
 

server/sonar-webserver-webapi/src/main/java/org/sonar/server/issue/TextRangeResponseFormatter.java

@@ -71,8 +71,10 @@ public class TextRangeResponseFormatter {
         return Optional.of(Common.FlowType.DATA);
       case EXECUTION:
         return Optional.of(Common.FlowType.EXECUTION);
+      case UNDEFINED:
+        // we should only get this value if no type was set (since it's the default value of the enum), in which case this method shouldn't be called.
       default:
-        return Optional.empty();
+        throw new IllegalArgumentException("Unrecognized flow type: " + flowType);
     }
   }
 

sonar-scanner-engine/src/main/java/org/sonar/scanner/issue/IssuePublisher.java

@@ -195,8 +195,10 @@ public class IssuePublisher {
         return ScannerReport.FlowType.EXECUTION;
       case DATA:
         return ScannerReport.FlowType.DATA;
-      default:
+      case UNDEFINED:
         return ScannerReport.FlowType.UNDEFINED;
+      default:
+        throw new IllegalArgumentException("Unrecognized flow type: " + flowType);
     }
   }