/**
* An example directive.
*/
public static class MyDirective extends Directive {
    public AnEnumeratedArgument myArgument;

    public MyDirective() {
        super("myDirective");
    }

    @Override
    public String toString() {
        StringBuilder _queryBuilder = new StringBuilder(super.toString());
        _queryBuilder.append("(");

        if (myArgument != null) {
            _queryBuilder.append("myArgument:");
            _queryBuilder.append(myArgument.toString());
        }

        _queryBuilder.append(")");
        return _queryBuilder.toString();
    }
}