prog-intro-2025/java/wordStat/WordStatLengthSuffix.java

import java.io.*;
import java.util.*;

public class WordStatLengthSuffix {
  public static void main(String[] args) {
    if (args.length != 2) {
      System.err.println("incorrect input!");
      System.err.println("usage: java WordStat inputFile outputFile");
    }

    String inputFileName = args[0];
    String outputFileName = args[1];
    try {
      BufferedReader r = new BufferedReader(new FileReader(inputFileName));

      Map<String, WordInfo> wordMap = new HashMap<>();
      StringBuilder sb = new StringBuilder();
      int wordIndex = 0;

      int data = r.read();
      while (data != -1) {
        char c = (char) data;

        if (Character.getType(c) == Character.DASH_PUNCTUATION || 
            Character.isLetter(c) || c == '\'') {
          sb.append(c);
        } else {
          if (sb.length() > 0) {
            String word = sb.toString().toLowerCase();
            if (word.length() != 1) {
              word = word.substring(word.length() / 2);
              if (wordMap.containsKey(word)) {
                wordMap.get(word).count++;
              } else {
                wordMap.put(word, new WordInfo(word, 1, wordIndex));
                wordIndex++;
              }
            }
            sb.setLength(0);
          }
        }
        
        data = r.read();
      }


      if (sb.length() > 0) {
         String word = sb.toString().toLowerCase();
         if (word.length() != 1) {
           word = word.substring(word.length() / 2);
           if (wordMap.containsKey(word)) {
             wordMap.get(word).count++;
           } else {
             wordMap.put(word, new WordInfo(word, 1, wordIndex));
             wordIndex++;
           }
         }
      }

      r.close();

      List<WordInfo> sortedWords = new ArrayList<>(wordMap.values());
      sortedWords.sort(Comparator.comparingInt((WordInfo w) -> w.word.length())
                                 .thenComparingInt(w -> w.firstIndex));


      PrintWriter writer = new PrintWriter(outputFileName, "UTF-8");
      
      for (WordInfo info : sortedWords) {
        writer.println(info.word + " " + info.count);
      }

      writer.close();

    } catch (Exception ex) {
      System.err.println("An error occured: " + ex.getMessage());
    }
  }
}