src/main/java/com/example/demo/RoleService.java

@@ -0,0 +1,24 @@
+package com.example.demo;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class RoleService {
+
+    public String getRoleName(String roleId) {
+        if (roleId == null || roleId.isBlank()) {
+            return "UNKNOWN";
+        }
+        return switch (roleId.toUpperCase()) {
+            case "ADMIN" -> "Administrator";
+            case "DEVELOPER" -> "Developer";
+            case "VIEWER" -> "Viewer";
+            default -> "Role: " + roleId;
+        };
+    }
+
+    public boolean isValidRole(String roleId) {
+        return roleId != null && !roleId.isBlank() &&
+               roleId.matches("^[A-Z_]+$");
+    }
+}