spring-graphql LocalContextValueMethodArgumentResolver 源码
spring-graphql LocalContextValueMethodArgumentResolver 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/method/annotation/support/LocalContextValueMethodArgumentResolver.java
/*
* Copyright 2002-2022 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.annotation.support;
import graphql.GraphQLContext;
import graphql.schema.DataFetchingEnvironment;
import org.springframework.core.MethodParameter;
import org.springframework.graphql.data.method.HandlerMethodArgumentResolver;
import org.springframework.graphql.data.method.annotation.LocalContextValue;
import org.springframework.util.Assert;
/**
* Resolver for a {@link LocalContextValue @LocalContextValue} annotated method
* parameter.
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
public class LocalContextValueMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
return (parameter.getParameterAnnotation(LocalContextValue.class) != null);
}
@Override
public Object resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment) {
LocalContextValue annotation = parameter.getParameterAnnotation(LocalContextValue.class);
Assert.state(annotation != null, "Expected @LocalContextValue annotation");
String name = ContextValueMethodArgumentResolver.getContextValueName(parameter, annotation.name(), annotation);
Object localContext = environment.getLocalContext();
Assert.state(localContext == null || localContext instanceof GraphQLContext,
"Local context is not an instance of graphql.GraphQLContext");
return ContextValueMethodArgumentResolver.resolveContextValue(
name, annotation.required(), parameter, (GraphQLContext) localContext);
}
}
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