* javacc output yet, but it will).
*/
final Set staleTrees = searchStaleGrammars(new File(sourceDirectory), ".jjt");
for (final Iterator it=staleTrees.iterator(); it.hasNext();) {
final File sourceFile = (File) it.next();
final JJTree parser = new JJTree();
final String[] args = generateJJTreeArgumentList(sourceFile.getPath());
final int status = parser.main(args);
if (status != 0) {
throw new MojoFailureException("JJTree failed with error code " + status + '.');
}
try {
FileUtils.copyFileToDirectory(sourceFile, new File(timestampDirectory));