spring HandlerMethodArgumentResolver 源码
spring HandlerMethodArgumentResolver 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/invocation/HandlerMethodArgumentResolver.java
/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.messaging.handler.invocation;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
/**
* Strategy interface for resolving method parameters into argument values
* in the context of a given {@link Message}.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public interface HandlerMethodArgumentResolver {
/**
* Whether the given {@linkplain MethodParameter method parameter} is
* supported by this resolver.
* @param parameter the method parameter to check
* @return {@code true} if this resolver supports the supplied parameter;
* {@code false} otherwise
*/
boolean supportsParameter(MethodParameter parameter);
/**
* Resolves a method parameter into an argument value from a given message.
* @param parameter the method parameter to resolve.
* This parameter must have previously been passed to
* {@link #supportsParameter(org.springframework.core.MethodParameter)}
* which must have returned {@code true}.
* @param message the currently processed message
* @return the resolved argument value, or {@code null}
* @throws Exception in case of errors with the preparation of argument values
*/
@Nullable
Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception;
}
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