protected static File createRelativePath()

in samoa-api/src/main/java/org/apache/samoa/moa/core/Utils.java [1780:1843]
62 lines of code
10 McCabe index (conditional complexity)

  protected static File createRelativePath(File absolute) throws Exception {
    File userDir = new File(System.getProperty("user.dir"));
    String userPath = userDir.getAbsolutePath() + File.separator;
    String targetPath = (new File(absolute.getParent())).getPath()
        + File.separator;
    String fileName = absolute.getName();
    StringBuffer relativePath = new StringBuffer();
    // relativePath.append("."+File.separator);
    // System.err.println("User dir "+userPath);
    // System.err.println("Target path "+targetPath);

    // file is in user dir (or subdir)
    int subdir = targetPath.indexOf(userPath);
    if (subdir == 0) {
      if (userPath.length() == targetPath.length()) {
        relativePath.append(fileName);
      } else {
        int ll = userPath.length();
        relativePath.append(targetPath.substring(ll));
        relativePath.append(fileName);
      }
    } else {
      int sepCount = 0;
      String temp = new String(userPath);
      while (temp.indexOf(File.separator) != -1) {
        int ind = temp.indexOf(File.separator);
        sepCount++;
        temp = temp.substring(ind + 1, temp.length());
      }

      String targetTemp = new String(targetPath);
      String userTemp = new String(userPath);
      int tcount = 0;
      while (targetTemp.indexOf(File.separator) != -1) {
        int ind = targetTemp.indexOf(File.separator);
        int ind2 = userTemp.indexOf(File.separator);
        String tpart = targetTemp.substring(0, ind + 1);
        String upart = userTemp.substring(0, ind2 + 1);
        if (tpart.compareTo(upart) != 0) {
          if (tcount == 0) {
            tcount = -1;
          }
          break;
        }
        tcount++;
        targetTemp = targetTemp.substring(ind + 1, targetTemp.length());
        userTemp = userTemp.substring(ind2 + 1, userTemp.length());
      }
      if (tcount == -1) {
        // then target file is probably on another drive (under windows)
        throw new Exception("Can't construct a path to file relative to user "
            + "dir.");
      }
      if (targetTemp.indexOf(File.separator) == -1) {
        targetTemp = "";
      }
      for (int i = 0; i < sepCount - tcount; i++) {
        relativePath.append(".." + File.separator);
      }
      relativePath.append(targetTemp + fileName);
    }
    // System.err.println("new path : "+relativePath.toString());
    return new File(relativePath.toString());
  }