org.springframework.web.servlet.function

Interface RequestPredicate

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface RequestPredicate

Represents a function that evaluates on a given ServerRequest. Instances of this function that evaluate on common request properties can be found in RequestPredicates.

Since:

5.2

Author:

Arjen Poutsma

See Also:

RequestPredicates, RouterFunctions.route(RequestPredicate, HandlerFunction), RouterFunctions.nest(RequestPredicate, RouterFunction)

Method Summary

Modifier and Type	Method and Description
default void	accept(RequestPredicates.Visitor visitor) Accept the given visitor.
default RequestPredicate	and(RequestPredicate other) Return a composed request predicate that tests against both this predicate AND the other predicate.
default RequestPredicate	negate() Return a predicate that represents the logical negation of this predicate.
default Optional<ServerRequest>	nest(ServerRequest request) Transform the given request into a request used for a nested route.
default RequestPredicate	or(RequestPredicate other) Return a composed request predicate that tests against both this predicate OR the other predicate.
boolean	test(ServerRequest request) Evaluate this predicate on the given request.

Method Detail

test

boolean test(ServerRequest request)

Evaluate this predicate on the given request.

Parameters:

request - the request to match against

Returns:

true if the request matches the predicate; false otherwise

and

default RequestPredicate and(RequestPredicate other)

Return a composed request predicate that tests against both this predicate AND the other predicate. When evaluating the composed predicate, if this predicate is false, then the other predicate is not evaluated.

Parameters:

other - a predicate that will be logically-ANDed with this predicate

Returns:

a predicate composed of this predicate AND the other predicate

negate

default RequestPredicate negate()

Return a predicate that represents the logical negation of this predicate.

Returns:

a predicate that represents the logical negation of this predicate

or

default RequestPredicate or(RequestPredicate other)

Return a composed request predicate that tests against both this predicate OR the other predicate. When evaluating the composed predicate, if this predicate is true, then the other predicate is not evaluated.

Parameters:

other - a predicate that will be logically-ORed with this predicate

Returns:

a predicate composed of this predicate OR the other predicate

nest

default Optional<ServerRequest> nest(ServerRequest request)

Transform the given request into a request used for a nested route. For instance, a path-based predicate can return a ServerRequest with a path remaining after a match.

The default implementation returns an Optional wrapping the given request if test(ServerRequest) evaluates to true; or Optional.empty() if it evaluates to false.

Parameters:

request - the request to be nested

Returns:

the nested request

See Also:

RouterFunctions.nest(RequestPredicate, RouterFunction)

accept

default void accept(RequestPredicates.Visitor visitor)

Accept the given visitor. Default implementation calls RequestPredicates.Visitor.unknown(RequestPredicate); composed RequestPredicate implementations are expected to call accept for all components that make up this request predicate.

Parameters:

visitor - the visitor to accept