/
HandlerMethodArgumentResolverComposite.java
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/
HandlerMethodArgumentResolverComposite.java
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/*
* Copyright 2002-2020 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.web.method.support;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
/**
* Resolves method parameters by delegating to a list of registered
* {@link HandlerMethodArgumentResolver HandlerMethodArgumentResolvers}.
* Previously resolved method parameters are cached for faster lookups.
*
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.1
*/
public class HandlerMethodArgumentResolverComposite implements HandlerMethodArgumentResolver {
private final List<HandlerMethodArgumentResolver> argumentResolvers = new ArrayList<>();
private final Map<MethodParameter, HandlerMethodArgumentResolver> argumentResolverCache =
new ConcurrentHashMap<>(256);
/**
* Add the given {@link HandlerMethodArgumentResolver}.
*/
public HandlerMethodArgumentResolverComposite addResolver(HandlerMethodArgumentResolver resolver) {
this.argumentResolvers.add(resolver);
return this;
}
/**
* Add the given {@link HandlerMethodArgumentResolver HandlerMethodArgumentResolvers}.
* @since 4.3
*/
public HandlerMethodArgumentResolverComposite addResolvers(
@Nullable HandlerMethodArgumentResolver... resolvers) {
if (resolvers != null) {
Collections.addAll(this.argumentResolvers, resolvers);
}
return this;
}
/**
* Add the given {@link HandlerMethodArgumentResolver HandlerMethodArgumentResolvers}.
*/
public HandlerMethodArgumentResolverComposite addResolvers(
@Nullable List<? extends HandlerMethodArgumentResolver> resolvers) {
if (resolvers != null) {
this.argumentResolvers.addAll(resolvers);
}
return this;
}
/**
* Return a read-only list with the contained resolvers, or an empty list.
*/
public List<HandlerMethodArgumentResolver> getResolvers() {
return Collections.unmodifiableList(this.argumentResolvers);
}
/**
* Clear the list of configured resolvers.
* @since 4.3
*/
public void clear() {
this.argumentResolvers.clear();
}
/**
* Whether the given {@linkplain MethodParameter method parameter} is
* supported by any registered {@link HandlerMethodArgumentResolver}.
*/
@Override
public boolean supportsParameter(MethodParameter parameter) {
return getArgumentResolver(parameter) != null;
}
/**
* Iterate over registered
* {@link HandlerMethodArgumentResolver HandlerMethodArgumentResolvers}
* and invoke the one that supports it.
* @throws IllegalArgumentException if no suitable argument resolver is found
*/
@Override
@Nullable
public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {
HandlerMethodArgumentResolver resolver = getArgumentResolver(parameter);
if (resolver == null) {
throw new IllegalArgumentException("Unsupported parameter type [" +
parameter.getParameterType().getName() + "]. supportsParameter should be called first.");
}
return resolver.resolveArgument(parameter, mavContainer, webRequest, binderFactory);
}
/**
* Find a registered {@link HandlerMethodArgumentResolver} that supports
* the given method parameter.
*/
@Nullable
private HandlerMethodArgumentResolver getArgumentResolver(MethodParameter parameter) {
HandlerMethodArgumentResolver result = this.argumentResolverCache.get(parameter);
if (result == null) {
for (HandlerMethodArgumentResolver resolver : this.argumentResolvers) {
if (resolver.supportsParameter(parameter)) {
result = resolver;
this.argumentResolverCache.put(parameter, result);
break;
}
}
}
return result;
}
}