1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.Arrays;
  5. public class HeaderParser {
  7. /**
  8. * Parses header arguments for staging environments with fallback logic.
  9. *
  10. * @param headers A map of header names to values.
  11. * @param stagingValues A map of staging environment specific values.
  12. * @param defaultValues A map of default values to use if staging values are not found.
  13. * @return A map of header names to their parsed values.
  14. */
  15. public static Map<String, String> parseHeaders(Map<String, String> headers,
  16. Map<String, String> stagingValues,
  17. Map<String, String> defaultValues) {
  19. Map<String, String> parsedHeaders = new HashMap<>();
  21. for (Map.Entry<String, String> entry : headers.entrySet()) {
  22. String headerName = entry.getKey();
  23. String headerValue = entry.getValue().trim(); // Trim whitespace
  25. // Check for staging value
  26. if (stagingValues != null && stagingValues.containsKey(headerName)) {
  27. parsedHeaders.put(headerName, stagingValues.get(headerName).trim());
  28. continue;
  29. }
  31. // Check for default value
  32. if (defaultValues != null && defaultValues.containsKey(headerName)) {
  33. parsedHeaders.put(headerName, defaultValues.get(headerName).trim());
  34. continue;
  35. }
  37. // If neither staging nor default value is found, use the original header value
  38. parsedHeaders.put(headerName, headerValue);
  39. }
  41. return parsedHeaders;
  42. }
  44. public static void main(String[] args) {
  45. // Example Usage
  46. Map<String, String> headers = new HashMap<>();
  47. headers.put("X-Staging-Value", "staging_data");
  48. headers.put("Content-Type", "application/json");
  49. headers.put("User-Agent", "MyApplication");
  51. Map<String, String> stagingValues = new HashMap<>();
  52. stagingValues.put("X-Staging-Value", "staging_data_override");
  53. stagingValues.put("Cache-Control", "no-cache");
  55. Map<String, String> defaultValues = new HashMap<>();
  56. defaultValues.put("Retry-After", "60");
  58. Map<String, String> parsedHeaders = parseHeaders(headers, stagingValues, defaultValues);
  60. System.out.println(parsedHeaders);
  61. }
  62. }

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