1. import java.io.*;
  2. import java.util.*;
  4. public class HeaderMerger {
  6. public static void main(String[] args) {
  7. if (args.length < 3) {
  8. System.out.println("Usage: java HeaderMerger <input1.txt> <input2.txt> <output.txt> [dry-run]");
  9. return;
  10. }
  12. String inputFile1 = args[0];
  13. String inputFile2 = args[1];
  14. String outputFile = args[2];
  15. boolean dryRun = false;
  16. if (args.length > 3 && args[3].equalsIgnoreCase("true")) {
  17. dryRun = true;
  18. }
  20. try {
  21. Map<String, Integer> headerCounts = new HashMap<>();
  23. // Read headers from the first file
  24. BufferedReader reader1 = new BufferedReader(new FileReader(inputFile1));
  25. String line;
  26. while ((line = reader1.readLine()) != null) {
  27. String[] parts = line.split(":", 2); // Split header and value
  28. if (parts.length == 2) {
  29. String header = parts[0].trim().toLowerCase(); // Normalize header
  30. headerCounts.put(header, headerCounts.getOrDefault(header, 0) + 1);
  31. }
  32. }
  33. reader1.close();
  35. // Read headers from the second file
  36. BufferedReader reader2 = new BufferedReader(new FileReader(inputFile2));
  37. while ((line = reader2.readLine()) != null) {
  38. String[] parts = line.split(":", 2);
  39. if (parts.length == 2) {
  40. String header = parts[0].trim().toLowerCase();
  41. headerCounts.put(header, headerCounts.getOrDefault(header, 0) + 1);
  42. }
  43. }
  44. reader2.close();
  46. // Merge the header counts
  47. Map<String, Integer> mergedHeaderCounts = new HashMap<>(headerCounts);
  48. for (Map.Entry<String, Integer> entry : headerCounts.entrySet()) {
  49. String header = entry.getKey();
  50. int count1 = entry.getValue();
  51. if (mergedHeaderCounts.containsKey(header)) {
  52. mergedHeaderCounts.put(header, mergedHeaderCounts.get(header) + count1);
  53. } else {
  54. mergedHeaderCounts.put(header, count1);
  55. }
  56. }
  59. // Write the merged headers to the output file
  60. BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile));
  61. for (Map.Entry<String, Integer> entry : mergedHeaderCounts.entrySet()) {
  62. writer.write(entry.getKey() + ": " + entry.getValue());
  63. writer.newLine();
  64. }
  65. writer.close();
  67. if (!dryRun) {
  68. System.out.println("Headers merged and saved to " + outputFile);
  69. } else {
  70. System.out.println("Dry run: Headers would be merged and saved to " + outputFile);
  71. }
  73. } catch (IOException e) {
  74. System.err.println("Error processing files: " + e.getMessage());
  75. }
  76. }
  77. }

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