001/*
002 * Copyright 2002-2016 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.reactive.result.method;
018
019import reactor.core.publisher.Mono;
020
021import org.springframework.core.MethodParameter;
022import org.springframework.web.reactive.BindingContext;
023import org.springframework.web.server.ServerWebExchange;
024
025/**
026 * Strategy to resolve the argument value for a method parameter in the context
027 * of the current HTTP request.
028 *
029 * @author Rossen Stoyanchev
030 * @since 5.0
031 */
032public interface HandlerMethodArgumentResolver {
033
034        /**
035         * Whether this resolver supports the given method parameter.
036         * @param parameter the method parameter
037         */
038        boolean supportsParameter(MethodParameter parameter);
039
040        /**
041         * Resolve the value for the method parameter.
042         * @param parameter the method parameter
043         * @param bindingContext the binding context to use
044         * @param exchange the current exchange
045         * @return {@code Mono} for the argument value, possibly empty
046         */
047        Mono<Object> resolveArgument(
048                        MethodParameter parameter, BindingContext bindingContext, ServerWebExchange exchange);
049
050}