code: private void cleanDirectory(File dir) {
  		if (isVerbose() || getLog().isDebugEnabled()) {
  			getLog().info("Deleting previously generated files in directory: " + dir.getPath());
  		}
  		if (dir.exists()) {
  			try {
  				FileUtils.cleanDirectory(dir);
  			} catch (IOException e) {
  				getLog().warn("Cleaning directory failed: " + e.getMessage());
  			}
  		}
  	}
docs: Deletes all files within the given directory.