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/*
* Copyright 2002-2018 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
*
* http://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.web.reactive.result.method.annotation;
import java.beans.ConstructorProperties;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import reactor.core.publisher.Mono;
import reactor.core.publisher.MonoProcessor;
import org.springframework.beans.BeanUtils;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.MethodParameter;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.ReactiveAdapter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.core.ResolvableType;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.lang.Nullable;
import org.springframework.ui.Model;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.support.WebExchangeBindException;
import org.springframework.web.bind.support.WebExchangeDataBinder;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport;
import org.springframework.web.server.ServerWebExchange;
/**
* Resolve {@code @ModelAttribute} annotated method arguments.
*
*
Model attributes are sourced from the model, or created using a default
* constructor and then added to the model. Once created the attribute is
* populated via data binding to the request (form data, query params).
* Validation also may be applied if the argument is annotated with
* {@code @javax.validation.Valid} or Spring's own
* {@code @org.springframework.validation.annotation.Validated}.
*
*
When this handler is created with {@code useDefaultResolution=true}
* any non-simple type argument and return value is regarded as a model
* attribute with or without the presence of an {@code @ModelAttribute}.
*
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 5.0
*/
public class ModelAttributeMethodArgumentResolver extends HandlerMethodArgumentResolverSupport {
private static final ParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer();
private final boolean useDefaultResolution;
/**
* Class constructor with a default resolution mode flag.
* @param adapterRegistry for adapting to other reactive types from and to Mono
* @param useDefaultResolution if "true", non-simple method arguments and
* return values are considered model attributes with or without a
* {@code @ModelAttribute} annotation present.
*/
public ModelAttributeMethodArgumentResolver(ReactiveAdapterRegistry adapterRegistry,
boolean useDefaultResolution) {
super(adapterRegistry);
this.useDefaultResolution = useDefaultResolution;
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
if (parameter.hasParameterAnnotation(ModelAttribute.class)) {
return true;
}
else if (this.useDefaultResolution) {
return checkParameterType(parameter, type -> !BeanUtils.isSimpleProperty(type));
}
return false;
}
@Override
public Mono
