javax.ws.rs.container
Interface ContainerRequestFilter

public interface ContainerRequestFilter

An extension interface implemented by container request filters. By default, i.e. if no name binding is applied to the filter implementation class, the filter(...) method is called at the pre-match extension point, i.e. prior to the actual resource matching takes place in the JAX-RS runtime. If there is a @NameBinding annotation applied to the filter, the filter will be executed at the post-match extension point, i.e. after a request was successfully matched with a resource method.

Use a pre-match request filter to update the input to the JAX-RS matching algorithm, e.g., the HTTP method, Accept header, return cached responses etc. Otherwise, the use of a request filter invoked at the post-match extension point (after a successful resource method matching) is recommended.

Filters implementing this interface must be annotated with @Provider to be discovered by the JAX-RS runtime. Container request filter instances may also be discovered and bound dynamically to particular resource methods.

Since:

2.0

Author:

Marek Potociar, Santiago Pericas-Geertsen

See Also:

PostMatching, ContainerResponseFilter

Method Summary

void	filter(ContainerRequestContext requestContext) Filter method called before a request has been dispatched to a resource.

Method Detail

filter

void filter(ContainerRequestContext requestContext)
            throws java.io.IOException

Filter method called before a request has been dispatched to a resource. By default, i.e. if no name binding is applied to the filter implementation class, the filter(...) method is called at the pre-match extension point, i.e. prior to the actual resource matching takes place in the JAX-RS runtime. If there is a @NameBinding annotation applied to the filter, the filter will be executed at the post-match extension point, i.e. after a request was successfully matched with a resource method.

Filters in the filter chain are ordered according to their binding priority (see BindingPriority). If a request filter produces a response by calling ContainerRequestContext.abortWith(javax.ws.rs.core.Response) method, the execution of the (either pre-match or post-match) request filter chain is stopped and the response is passed to the corresponding response filter chain (either pre-match or post-match). For example, a pre-match caching filter may produce a response in this way, which would effectively skip any post-match request filters as well as post-match response filters. Note however that a responses produced in this manner would still be processed by the pre-match response filter chain.

Parameters:

requestContext - request context.

Throws:

java.io.IOException - if an I/O exception occurs.

See Also:

PostMatching