private void checkForGzippedVcf() {
   String vcfName = finalVcf.getName();
   if (vcfName.endsWith(".gz")) {
     File uncomp = new File(finalVcf.getParentFile(), vcfName.substring(0, vcfName.length() - 3));
     if (uncomp.exists() == false) {
       deleteTempVcf = true;
       if (IO.uncompress(finalVcf, uncomp) == null)
         Misc.printErrAndExit("ERROR: failed to uncompress -> " + finalVcf);
     }
     finalVcf = uncomp;
   }
 }