public File findFile(String relativePath) {
    relativePath = trimStartSlash(relativePath);
    String prefix = myPrefix;
    if (prefix != null) {
      prefix = trimStartSlash(ensureEndsWithSlash(prefix));
      if (!relativePath.toLowerCase(Locale.ENGLISH).startsWith(prefix.toLowerCase(Locale.ENGLISH))) {
        return null;
      }
      relativePath = relativePath.substring(prefix.length());
    }

    String[] dirsList = list();
    for (String aDirsList : dirsList) {
      String fullPath = ensureEndsWithSlash(aDirsList) + relativePath;
      File file = new File(fullPath.replace('/', File.separatorChar));
      if (file.isFile()) {
        return file;
      }
    }
    return null;
  }
public File findFile(String relativePath)