import java.io.IOException;

/**
 * A Huffman encoder and decoder.
 *
 * @author Zach Tomaszewski
 */
public class ZtomaszeA10 {

  /**
   * Takes a filename to process as a command line argument.
   * If the filename ends in ".huff", decompresses it into a file with the
   * ".huff" extension removed.  If the filename does not end in ".huff",
   * compresses the file into a new file with ".huff" appended to the name.
   */
  public static void main(String[] args) {
    if (args.length == 0) {
      System.out.println("Error: No filename given.");
      System.out.println();
      System.out.println("Usage: java ZtomaszeA11 filename");
      System.out.println("If filename ends in .huff, will decompress.");
      System.out.println("If filename does not end in .huff, will compress.");
      return;
    }
    try {
      String filename = args[0];
      if (filename.endsWith(".huff")) {
        Huffman.decompress(filename);
      }else {
        Huffman.compress(filename);
      }
    }catch (IOException e) {
      System.err.println("Error: Could not complete: " + e.getMessage());
    }
  }
}