spring-graphql DataFetchingEnvironmentMethodArgumentResolver 源码
spring-graphql DataFetchingEnvironmentMethodArgumentResolver 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/method/annotation/support/DataFetchingEnvironmentMethodArgumentResolver.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 java.util.Locale;
import java.util.Optional;
import graphql.GraphQLContext;
import graphql.schema.DataFetchingEnvironment;
import graphql.schema.DataFetchingFieldSelectionSet;
import org.springframework.core.MethodParameter;
import org.springframework.graphql.data.method.HandlerMethodArgumentResolver;
/**
* Resolver for {@link DataFetchingEnvironment} and related values that can be
* accessed through the {@link DataFetchingEnvironment} such as:
* <ul>
* <li>{@link GraphQLContext}
* <li>{@link DataFetchingFieldSelectionSet}
* <li>{@link Locale} or {@code Optional<Locale>}
* </ul>as well as arguments of type
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
public class DataFetchingEnvironmentMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
Class<?> type = parameter.getParameterType();
return (type.equals(DataFetchingEnvironment.class) || type.equals(GraphQLContext.class) ||
type.equals(DataFetchingFieldSelectionSet.class) ||
type.equals(Locale.class) || isOptionalLocale(parameter));
}
private static boolean isOptionalLocale(MethodParameter parameter) {
return parameter.nestedIfOptional().getNestedParameterType().equals(Locale.class);
}
@Override
public Object resolveArgument(MethodParameter parameter, DataFetchingEnvironment environment) {
Class<?> type = parameter.getParameterType();
if (type.equals(GraphQLContext.class)) {
return environment.getGraphQlContext();
}
else if (type.equals(DataFetchingFieldSelectionSet.class)) {
return environment.getSelectionSet();
}
else if (type.equals(Locale.class)) {
return environment.getLocale();
}
else if (isOptionalLocale(parameter)) {
return Optional.ofNullable(environment.getLocale());
}
else if (type.equals(DataFetchingEnvironment.class)) {
return environment;
}
else {
throw new IllegalStateException("Unexpected method parameter type: " + parameter);
}
}
}
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