1. import org.json.JSONObject;
  2. import org.json.JSONArray;
  4. public class ResponseTransformer {
  6. /**
  7. * Transforms a JSON response to a specific format.
  8. * @param jsonString The JSON string to transform.
  9. * @param transformationType The type of transformation to perform (e.g., "user", "product").
  10. * @return A transformed JSON string, or null if transformation fails.
  11. */
  12. public static String transformResponse(String jsonString, String transformationType) {
  13. try {
  14. JSONObject json = new JSONObject(jsonString);
  16. if (transformationType.equals("user")) {
  17. // Example: Transform to a user-specific format
  18. JSONObject transformedJson = new JSONObject();
  19. transformedJson.put("userId", json.getString("id"));
  20. transformedJson.put("userName", json.getString("name"));
  21. transformedJson.put("userEmail", json.getString("email"));
  22. return transformedJson.toString();
  23. } else if (transformationType.equals("product")) {
  24. // Example: Transform to a product-specific format
  25. JSONObject transformedJson = new JSONObject();
  26. transformedJson.put("productId", json.getString("product_id"));
  27. transformedJson.put("productName", json.getString("product_name"));
  28. transformedJson.put("productPrice", Double.parseDouble(json.getString("price"))); // Parse price as double
  29. return transformedJson.toString();
  30. } else {
  31. // Unknown transformation type
  32. return null;
  33. }
  34. } catch (Exception e) {
  35. // Handle potential JSON parsing errors
  36. System.err.println("Error transforming response: " + e.getMessage());
  37. return null;
  38. }
  39. }
  41. /**
  42. * Transforms a JSON response with array of data.
  43. * @param jsonString The JSON string to transform.
  44. * @param transformationType The type of transformation to perform (e.g., "user", "product").
  45. * @return A transformed JSON string, or null if transformation fails.
  46. */
  47. public static String transformResponseArray(String jsonString, String transformationType) {
  48. try {
  49. JSONArray jsonArray = new JSONArray(jsonString);
  50. JSONObject transformedArray = new JSONObject();
  51. JSONArray transformedArrayData = new JSONArray();
  53. for (int i = 0; i < jsonArray.length(); i++) {
  54. JSONObject item = jsonArray.getJSONObject(i);
  55. if (transformationType.equals("user")) {
  56. JSONObject transformedItem = new JSONObject();
  57. transformedItem.put("userId", item.getString("id"));
  58. transformedItem.put("userName", item.getString("name"));
  59. transformedItem.put("userEmail", item.getString("email"));
  60. transformedArrayData.put(transformedItem);
  61. } else if (transformationType.equals("product")) {
  62. JSONObject transformedItem = new JSONObject();
  63. transformedItem.put("productId", item.getString("product_id"));
  64. transformedItem.put("productName", item.getString("product_name"));
  65. transformedItem.put("productPrice", Double.parseDouble(item.getString("price")));
  66. transformedArrayData.put(transformedItem);
  67. }
  68. else {
  69. return null;
  70. }
  71. }
  72. transformedArray.put(transformedArrayData);
  73. return transformedArray.toString();
  75. } catch (Exception e) {
  76. System.err.println("Error transforming response: " + e.getMessage());
  77. return null;
  78. }
  79. }
  82. public static void main(String[] args) {
  83. // Example Usage
  84. String userJson = "{\"id\": 123, \"name\": \"John Doe\", \"email\": \"john.doe@example.com\"}";
  85. String transformedUserJson = transformResponse(userJson, "user");
  86. System.out.println("Transformed User: " + transformedUserJson);
  88. String productJson = "{\"product_id\": \"456\", \"product_name\": \"Awesome Gadget\", \"price\": \"99.99\"}";
  89. String transformedProductJson = transformResponse(productJson, "product");
  90. System.out.println("Transformed Product: " + transformedProductJson);
  92. String userJsonArray = "[{\"id\": 123, \"name\": \"John Doe\", \"email\": \"john.doe@example.com\"}, {\"id\": 456, \"name\": \"Jane Smith\", \"email\": \"jane.smith@example.

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