org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport Maven / Gradle / Ivy
/*
* Copyright 2002-2017 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;
import java.lang.annotation.Annotation;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.util.Assert;
/**
* Base class for {@link HandlerMethodArgumentResolver} implementations with access to a
* {@code ReactiveAdapterRegistry} and methods to check for method parameter support.
*
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 5.0
*/
public abstract class HandlerMethodArgumentResolverSupport implements HandlerMethodArgumentResolver {
private final ReactiveAdapterRegistry adapterRegistry;
protected HandlerMethodArgumentResolverSupport(ReactiveAdapterRegistry adapterRegistry) {
Assert.notNull(adapterRegistry, "ReactiveAdapterRegistry is required");
this.adapterRegistry = adapterRegistry;
}
/**
* Return the configured {@link ReactiveAdapterRegistry}.
*/
public ReactiveAdapterRegistry getAdapterRegistry() {
return this.adapterRegistry;
}
/**
* Evaluate the {@code Predicate} on the method parameter type or on
* the generic type within a reactive type wrapper.
*/
protected boolean checkParameterType(MethodParameter parameter, Predicate> predicate) {
Class type = parameter.getParameterType();
ReactiveAdapter adapter = getAdapterRegistry().getAdapter(type);
if (adapter != null) {
assertHasValues(adapter, parameter);
type = parameter.nested().getNestedParameterType();
}
return predicate.test(type);
}
private void assertHasValues(ReactiveAdapter adapter, MethodParameter param) {
if (adapter.isNoValue()) {
throw new IllegalArgumentException(
"No value reactive types not supported: " + param.getGenericParameterType());
}
}
/**
* Evaluate the {@code Predicate} on the method parameter type but raise an
* {@code IllegalStateException} if the same matches the generic type
* within a reactive type wrapper.
*/
protected boolean checkParameterTypeNoReactiveWrapper(MethodParameter parameter, Predicate> predicate) {
Class type = parameter.getParameterType();
ReactiveAdapter adapter = getAdapterRegistry().getAdapter(type);
if (adapter != null) {
assertHasValues(adapter, parameter);
type = parameter.nested().getNestedParameterType();
}
if (predicate.test(type)) {
if (adapter == null) {
return true;
}
throw buildReactiveWrapperException(parameter);
}
return false;
}
private IllegalStateException buildReactiveWrapperException(MethodParameter parameter) {
return new IllegalStateException(getClass().getSimpleName() +
" doesn't support reactive type wrapper: " + parameter.getGenericParameterType());
}
/**
* Evaluate the {@code Predicate} on the method parameter type if it has the
* given annotation, nesting within {@link java.util.Optional} if necessary,
* but raise an {@code IllegalStateException} if the same matches the generic
* type within a reactive type wrapper.
*/
protected boolean checkAnnotatedParamNoReactiveWrapper(
MethodParameter parameter, Class annotationType, BiPredicate> typePredicate) {
A annotation = parameter.getParameterAnnotation(annotationType);
if (annotation == null) {
return false;
}
parameter = parameter.nestedIfOptional();
Class type = parameter.getNestedParameterType();
ReactiveAdapter adapter = getAdapterRegistry().getAdapter(type);
if (adapter != null) {
assertHasValues(adapter, parameter);
parameter = parameter.nested();
type = parameter.getNestedParameterType();
}
if (typePredicate.test(annotation, type)) {
if (adapter == null) {
return true;
}
throw buildReactiveWrapperException(parameter);
}
return false;
}
}