spring-graphql ContextValue 源码
spring-graphql ContextValue 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/method/annotation/ContextValue.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;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import graphql.schema.DataFetchingEnvironment;
import org.springframework.core.annotation.AliasFor;
/**
* Annotation to bind a method parameter to an attribute from the
* {@link DataFetchingEnvironment#getGraphQlContext() main} {@code GraphQLContext}.
*
* <p>To bind to an attribute from the local context instead, see
* {@link LocalContextValue @LocalContextValue}.
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ContextValue {
/**
* Alias for {@link #name}.
*/
@AliasFor("name")
String value() default "";
/**
* The name of the value to bind to.
*/
@AliasFor("value")
String name() default "";
/**
* Whether the value is required.
* <p>Defaults to "true", leading to an exception thrown if the value is
* missing. Switch to "false" if you prefer {@code null} if the value is
* not present, or use {@link java.util.Optional}.
*/
boolean required() default true;
}
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