spring-graphql ArgumentMethodArgumentResolver 源码
spring-graphql ArgumentMethodArgumentResolver 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/method/annotation/support/ArgumentMethodArgumentResolver.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.support;
import graphql.schema.DataFetchingEnvironment;
import org.springframework.core.MethodParameter;
import org.springframework.core.ResolvableType;
import org.springframework.graphql.data.GraphQlArgumentBinder;
import org.springframework.graphql.data.method.HandlerMethodArgumentResolver;
import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Resolver for {@link Argument @Argument} annotated method parameters, obtained
* via {@link DataFetchingEnvironment#getArgument(String)} and converted to the
* declared type of the method parameter.
*
* @author Rossen Stoyanchev
* @author Brian Clozel
* @since 1.0.0
* @see Argument
*/
public class ArgumentMethodArgumentResolver implements HandlerMethodArgumentResolver {
private final GraphQlArgumentBinder argumentBinder;
public ArgumentMethodArgumentResolver(GraphQlArgumentBinder argumentBinder) {
Assert.notNull(argumentBinder, "GraphQlArgumentBinder is required");
this.argumentBinder = argumentBinder;
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
return (parameter.getParameterAnnotation(Argument.class) != null);
}
@Override
public Object resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment) throws Exception {
String name = getArgumentName(parameter);
ResolvableType resolvableType = ResolvableType.forMethodParameter(parameter);
return this.argumentBinder.bind(environment, name, resolvableType);
}
static String getArgumentName(MethodParameter parameter) {
Argument annotation = parameter.getParameterAnnotation(Argument.class);
Assert.state(annotation != null, "Expected @Argument annotation");
if (StringUtils.hasText(annotation.name())) {
return annotation.name();
}
String parameterName = parameter.getParameterName();
if (parameterName != null) {
return parameterName;
}
throw new IllegalArgumentException(
"Name for argument of type [" + parameter.getNestedParameterType().getName() +
"] not specified, and parameter name information not found in class file either.");
}
}
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