AOT for Spring ViewComponents with Thomas

VcConfiguration.java

@Configuration
class VcConfiguration {
    
    @Bean
    static ViewComponentResourceAotProcessor viewComponentResourceAotProcessor() {
        return new ViewComponentResourceAotProcessor();
    }
}

class ViewComponentResourceAotProcessor implements BeanRegistrationAotProcessor {

    // todo share this logic with the AOP aspect
    private static Resource viewComponentTemplateResourceFor(Class<?> clzz) {
        var name = '/' + clzz.getPackage().getName().replace(".", "/") + '/' + clzz.getSimpleName() + ".html";
        return new ClassPathResource(name);
    }

    @Override
    public BeanRegistrationAotContribution processAheadOfTime(RegisteredBean registeredBean) {
        var clzz = registeredBean.getBeanClass();
        var isViewComponent = MergedAnnotations.from(clzz).isPresent(ViewComponent.class);
        if (isViewComponent) {
            return (generationContext, beanRegistrationCode) -> {
                var resource = viewComponentTemplateResourceFor(clzz);
                Assert.state(resource.exists(), "the resource for the @ViewComponent class %s could not be found!".formatted(clzz.getName()));
                generationContext.getRuntimeHints().resources().registerResource(resource);
            };
        }
        return null;
    }
}