1. import java.util.HashMap;
  2. import java.util.Map;
  4. public class RuntimeMapper {
  6. /**
  7. * Maps runtime environment fields to data migration fields with graceful failure handling.
  8. *
  9. * @param runtimeEnv A map containing runtime environment variables.
  10. * @param mapping A map defining the mapping between runtime fields and data migration fields.
  11. * @return A map containing the mapped data, or an empty map if mapping fails.
  12. */
  13. public static Map<String, String> mapRuntimeToData(Map<String, String> runtimeEnv, Map<String, String> mapping) {
  14. Map<String, String> data = new HashMap<>();
  16. if (runtimeEnv == null || mapping == null) {
  17. System.err.println("Error: Runtime environment or mapping is null.");
  18. return data; // Return empty map on error
  19. }
  21. for (Map.Entry<String, String> entry : mapping.entrySet()) {
  22. String runtimeField = entry.getKey();
  23. String dataField = entry.getValue();
  25. if (runtimeEnv.containsKey(runtimeField)) {
  26. String runtimeValue = runtimeEnv.get(runtimeField);
  28. //Basic validation, add more as needed.
  29. if (runtimeValue != null && !runtimeValue.isEmpty()) {
  30. data.put(dataField, runtimeValue);
  31. } else {
  32. System.err.println("Warning: Missing or empty value for runtime field: " + runtimeField);
  33. }
  35. } else {
  36. System.err.println("Warning: Runtime field not found: " + runtimeField);
  37. }
  38. }
  40. return data;
  41. }
  43. public static void main(String[] args) {
  44. //Example usage
  45. Map<String, String> runtimeEnv = new HashMap<>();
  46. runtimeEnv.put("DATABASE_URL", "jdbc:mysql://localhost:3306/mydatabase");
  47. runtimeEnv.put("USER", "myuser");
  48. runtimeEnv.put("PASSWORD", "mypassword");
  50. Map<String, String> mapping = new HashMap<>();
  51. mapping.put("DATABASE_URL", "db_url");
  52. mapping.put("USER", "username");
  53. mapping.put("PASSWORD", "password");
  54. mapping.put("API_KEY", "api_key"); //This will generate a warning
  56. Map<String, String> mappedData = mapRuntimeToData(runtimeEnv, mapping);
  58. System.out.println("Mapped Data: " + mappedData);
  59. }
  60. }

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