/** This method will process each argument and assign new varibles */
  public void processArgs(String[] args) {
    Pattern pat = Pattern.compile("-[a-z]");
    File dir = null;
    for (int i = 0; i < args.length; i++) {
      String lcArg = args[i].toLowerCase();
      Matcher mat = pat.matcher(lcArg);
      if (mat.matches()) {
        char test = args[i].charAt(1);
        try {
          switch (test) {
            case 'f':
              dir = new File(args[i + 1]);
              i++;
              break;
            case 'v':
              genomeVersion = args[i + 1];
              i++;
              break;
            case 's':
              strand = args[++i];
              break;
            case 't':
              stairStep = true;
              break;
            case 'h':
              printDocs();
              System.exit(0);
            default:
              Misc.printExit("\nError: unknown option! " + mat.group());
          }
        } catch (Exception e) {
          Misc.printExit(
              "\nSorry, something doesn't look right with this parameter: -" + test + "\n");
        }
      }
    }
    if (dir == null || dir.canRead() == false)
      Misc.printExit("\nError: cannot find or read your sgr file/ directory.\n");
    File[][] tot = new File[3][];
    tot[0] = IO.extractFiles(dir, ".sgr");
    tot[1] = IO.extractFiles(dir, ".sgr.zip");
    tot[2] = IO.extractFiles(dir, ".sgr.gz");
    sgrFiles = IO.collapseFileArray(tot);

    if (sgrFiles == null || sgrFiles.length == 0)
      Misc.printExit("\nError: cannot find your xxx.sgr.zip file(s)");
    if (genomeVersion == null)
      Misc.printExit(
          "\nError: you must supply a genome version. Goto http://genome.ucsc.edu/cgi-"
              + "bin/hgGateway load your organism to find the associated genome version.\n");
  }
  // constructor
  public Sgr2Bar(String[] args) {
    try {
      // check for args
      processArgs(args);

      System.out.println("Genome version -> " + genomeVersion);
      System.out.println("Strand -> " + strand);
      System.out.println("Stair Step? -> " + stairStep);
      System.out.println();

      // load tagValues
      if (stairStep) tagValues.put(BarParser.GRAPH_TYPE_TAG, BarParser.GRAPH_TYPE_STAIRSTEP);
      else tagValues.put(BarParser.GRAPH_TYPE_TAG, BarParser.GRAPH_TYPE_BAR);

      for (int x = 0; x < sgrFiles.length; x++) {
        System.out.println("\tLoading -> " + sgrFiles[x]);
        GrGraph[] grs = GrGraph.loadSgrFile(sgrFiles[x]);

        // make save directory
        String dirName;

        dirName = Misc.removeExtension(sgrFiles[x].getCanonicalPath());

        File dir = new File(dirName);
        dir.mkdir();
        // print bar files
        System.out.println("\tSaving...");
        for (int i = 0; i < grs.length; i++) {
          File barFile = new File(dir, grs[i].getChromosome() + ".bar");
          barParser.writeBarFile(
              barFile,
              grs[i].getChromosome(),
              genomeVersion,
              strand.charAt(0),
              grs[i].getBasePositions(),
              grs[i].getValues(),
              tagValues);
        }
      }
      System.out.println("\nDone!\n");
    } catch (IOException e) {
      e.printStackTrace();
      Misc.printErrAndExit("\nFailed to parse file!");
    }
  }