@Override
 public void initializeDriver() {
   // Where are the input files?
   String dirName = getParam("japex.inputDir");
   if (dirName == null) {
     throw new RuntimeException("japex.inputFile not specified");
   }
   _inputDir = new File(dirName);
   if (!_inputDir.exists() || !_inputDir.isDirectory()) {
     throw new IllegalArgumentException(
         "No input directory '" + _inputDir.getAbsolutePath() + "'");
   }
   _streaming = getBooleanParam("streaming");
 }