private static String getOnDemandClassName(Class<?> extensionType) {
        return getGeneratedClassName(extensionType) + "$OnDemand";
    }
Attach a sql object from a jdbi generator created class.

@param extensionType  the type of sql object to create.
@param handleSupplier the Handle instance to attach this sql object to.
@return the new sql object bound to this handle.
sqlobject/src/main/java/org/jdbi/v3/sqlobject/GeneratorSqlObjectFactory.java