1. import java.io.BufferedReader;
  2. import java.io.FileReader;
  3. import java.io.IOException;
  4. import java.util.HashMap;
  5. import java.util.Map;
  7. public class LogFileHasher {
  9. public static void main(String[] args) {
  10. if (args.length != 1) {
  11. System.out.println("Usage: java LogFileHasher <log_file_path>");
  12. return;
  13. }
  15. String logFilePath = args[0];
  16. String hash = calculateLogFileHash(logFilePath);
  18. if (hash != null) {
  19. System.out.println("Log file hash: " + hash);
  20. } else {
  21. System.err.println("Error processing log file: " + logFilePath);
  22. }
  23. }
  25. public static String calculateLogFileHash(String logFilePath) {
  26. HashMap<String, Integer> charCounts = new HashMap<>();
  28. try (BufferedReader reader = new BufferedReader(new FileReader(logFilePath))) {
  29. String line;
  30. while ((line = reader.readLine()) != null) {
  31. for (int i = 0; i < line.length(); i++) {
  32. char c = line.charAt(i);
  33. charCounts.put(String.valueOf(c), charCounts.getOrDefault(String.valueOf(c), 0) + 1);
  34. }
  35. }
  36. } catch (IOException e) {
  37. System.err.println("Error reading file: " + e.getMessage());
  38. return null; // Indicate error
  39. }
  41. // Simple hash calculation - sum of character counts (can be improved)
  42. int hash = 0;
  43. for (int count : charCounts.values()) {
  44. hash += count;
  45. }
  47. return String.valueOf(hash);
  48. }
  49. }

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