Created
December 16, 2015 08:04
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| /** | |
| * Wires {@link Validate} annotation with rest call to perform validation on the request entity | |
| * ... | |
| * @POST | |
| * ... | |
| * @Validate(RequestValidator.class) | |
| * public Response restCall(TransportModel request) | |
| * | |
| * <aop:aspectj-autoproxy /> | |
| */ | |
| @Aspect | |
| @Component | |
| public class ValidatorAspect { | |
| @Autowired | |
| private ApplicationContext context; | |
| @Around(value = "@annotation(annotation)", argNames = "restCall,annotation") | |
| public Object validate(ProceedingJoinPoint restCall, Validate annotation) throws Throwable { | |
| // lookup for validator based on the provided by annotation | |
| final GenericValidator validator = context.getBean(annotation.value()); | |
| final Object[] arguments = restCall.getArgs(); | |
| if (arguments.length != 1) { | |
| throw new IllegalArgumentException("Expected only one argument on the method marked with @Validate " + | |
| "annotation with value [" + annotation.value() + "]"); | |
| } | |
| // transport model validation | |
| final Option<Failure> result = validator.validate(arguments[0]); | |
| // if valid proceed with the rest call otherwise proceed with validator | |
| return (result.isEmpty()) ? restCall.proceed() : validator.proceed(result.get()); | |
| } | |
| } | |
| /** | |
| * Annotates REST resource methods to provide validation for transport models | |
| */ | |
| @Target(ElementType.METHOD) | |
| @Retention(RetentionPolicy.RUNTIME) | |
| public @interface Validate | |
| { | |
| /** | |
| * Provides validator class | |
| */ | |
| Class<? extends GenericValidator> value(); | |
| } | |
| /** | |
| * Defines common operations for transport model validators | |
| */ | |
| @Component | |
| public abstract class GenericValidator<T extends GeneratedMessage, R extends GeneratedMessage> implements Validator<T> { | |
| @Autowired | |
| private HttpServerAccessor httpServerAccessor; | |
| @Autowired | |
| private FailureProvider failure; | |
| public abstract R transform(Failure failure); | |
| protected Option<Failure> reject(int errorCode, String errorMessage) { | |
| return Option.option(failure.create(errorCode, errorMessage)); | |
| } | |
| protected Option<Failure> accept() { | |
| return Option.none(); | |
| } | |
| protected Response proceed(Failure failure) { | |
| return httpServerAccessor.newPostResponse(transform(failure)).build(); | |
| } | |
| } |
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