br.com.caelum.vraptor.interceptor

Interface Interceptor

All Known Subinterfaces:

MultipartInterceptor

All Known Implementing Classes:

CommonsUploadMultipartInterceptor, DeserializingInterceptor, DownloadInterceptor, ExceptionHandlerInterceptor, ExecuteMethodInterceptor, FlashInterceptor, ForwardToDefaultViewInterceptor, InstantiateInterceptor, MethodValidatorInterceptor, NullMultipartInterceptor, OutjectResult, ParametersInstantiatorInterceptor, ResourceControllerInterceptor, ResourceLookupInterceptor, Servlet3MultipartInterceptor

public interface Interceptor

Whenever an interceptor accepts a resource method, its intercept method is invoked to intercept the process of request parsing in order to allow the software to do some specific tasks.
Common usage for interceptors for end-users (end-programmers) are security constraint checks, database session (open session in view) opening and much more. If you have an interceptor A which depends on an interceptor B, i.e, interceptor B must be executed before interceptor A, use InterceptorSequence. If the accepts(ResourceMethod) method only depends on received ResourceMethod, you can annotate the interceptor with @Lazy, so the Interceptor will only be instantiated if the accepts returns true. You should not use @Lazy if accepts is constant, or depends on any constructor parameter.

Author:

Guilherme Silveira

See Also:

InterceptorSequence, Lazy

Method Summary

Methods

Modifier and Type	Method and Description
boolean	accepts(ResourceMethod method)
void	intercept(InterceptorStack stack, ResourceMethod method, java.lang.Object resourceInstance)

Method Detail

intercept

void intercept(InterceptorStack stack,
             ResourceMethod method,
             java.lang.Object resourceInstance)
               throws InterceptionException

Throws:

InterceptionException

accepts

boolean accepts(ResourceMethod method)