spring-graphql Argument 源码
spring-graphql Argument 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/method/annotation/Argument.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.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 org.springframework.core.annotation.AliasFor;
import org.springframework.validation.BindException;
/**
* Annotation to bind a named GraphQL
* {@link graphql.schema.DataFetchingEnvironment#getArgument(String) argument}
* onto a method parameter.
*
* <p>Binding is performed by mapping argument values to a primary data
* constructor of the expected method parameter type, or by using a default
* constructor to create it and then map values to its properties. This is
* applied recursively, using all nested values and creating nested target
* objects.
*
* <p>If binding fails, a {@link BindException} is raised with binding issues
* accumulated as {@link BindException#getFieldErrors() field errors} where the
* {@code field} of each error is the argument path where the issue occurred.
*
* <p>If the method parameter is {@link java.util.Map Map<String, Object>}
* and a parameter name is not specified, then the resolves value is the raw
* {@link graphql.schema.DataFetchingEnvironment#getArguments() arguments} map.
*
* <p>Note that this annotation has neither a "required" flag nor the option to
* specify a default value, both of which can be specified at the GraphQL schema
* level and are enforced by the GraphQL Java engine.
*
* @author Rossen Stoyanchev
* @since 1.0.0
* @see Arguments
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Argument {
/**
* Alias for {@link #name}.
*/
@AliasFor("name")
String value() default "";
/**
* The name of the input argument to bind to.
*/
@AliasFor("value")
String name() default "";
}
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