spring-graphql HandlerMethodArgumentResolver 源码
spring-graphql HandlerMethodArgumentResolver 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/method/HandlerMethodArgumentResolver.java
/*
* Copyright 2002-2021 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.graphql.data.method;
import graphql.schema.DataFetchingEnvironment;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
/**
* Strategy interface for resolving method parameters into argument values in
* the context of a given {@link DataFetchingEnvironment}.
*
* <p>Most implementations will be synchronous, simply resolving values from the
* {@code DataFetchingEnvironment}. However, a resolver may also return a
* {@link reactor.core.publisher.Mono} if it needs to be asynchronous.
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
public interface HandlerMethodArgumentResolver {
/**
* Whether this resolver supports the given {@link MethodParameter}.
*/
boolean supportsParameter(MethodParameter parameter);
/**
* Resolve a method parameter to a value.
*
* @param parameter the method parameter to resolve. This parameter must
* have previously checked via {@link #supportsParameter}.
* @param environment the environment to use to resolve the value
*
* @return the resolved value, which may be {@code null} if not resolved;
* the value may also be a {@link reactor.core.publisher.Mono} if it
* requires asynchronous resolution.
*
* @throws Exception in case of errors with the preparation of argument values
*/
@Nullable
Object resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment) throws Exception;
}
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