public InputStream newInputStream() throws IOException {
   InputStream input = getBase().newInputStream();
   for (int i = 1; ; i++) {
     FilePath f = getBase(i);
     if (f.exists()) {
       InputStream i2 = f.newInputStream();
       input = new SequenceInputStream(input, i2);
     } else {
       break;
     }
   }
   return input;
 }