private void writeDefAssignment(TreeLogger logger, SourceWriter sw,
JMethod toImplement, CssStylesheet cssStylesheet)
throws UnableToCompleteException {
SubstitutionCollector collector = new SubstitutionCollector();
collector.accept(cssStylesheet);
String name = toImplement.getName();
// TODO: Annotation for override
CssDef def = collector.getSubstitutions().get(name);