public final S handle(Object arg) {
        if (arg instanceof Expression) {
            ((Expression<?>) arg).accept(this, null);
        } else {
            visitConstant(arg);
        }
        return self;
    }
{@code SerializerBase} is a stub for Serializer implementations which serialize query metadata to Strings

@param <S> concrete subtype
@author tiwe
querydsl-core/src/main/java/com/querydsl/core/support/SerializerBase.java