org.springframework.web.reactive.result.method.annotation.ServerWebExchangeArgumentResolver Maven / Gradle / Ivy
/*
* 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.time.ZoneId;
import java.util.Locale;
import java.util.TimeZone;
import org.springframework.context.i18n.LocaleContext;
import org.springframework.context.i18n.TimeZoneAwareLocaleContext;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.HttpMethod;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport;
import org.springframework.web.reactive.result.method.SyncHandlerMethodArgumentResolver;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.util.UriBuilder;
import org.springframework.web.util.UriComponentsBuilder;
/**
* Resolves ServerWebExchange-related method argument values of the following types:
*
* - {@link ServerWebExchange}
*
- {@link ServerHttpRequest}
*
- {@link ServerHttpResponse}
*
- {@link HttpMethod}
*
- {@link Locale}
*
- {@link TimeZone}
*
- {@link ZoneId}
*
- {@link UriBuilder} or {@link UriComponentsBuilder} -- for building URL's
* relative to the current request
*
*
* For the {@code WebSession} see {@link WebSessionArgumentResolver}
* and for the {@code Principal} see {@link PrincipalArgumentResolver}.
*
* @author Rossen Stoyanchev
* @since 5.0
* @see WebSessionArgumentResolver
* @see PrincipalArgumentResolver
*/
public class ServerWebExchangeArgumentResolver extends HandlerMethodArgumentResolverSupport
implements SyncHandlerMethodArgumentResolver {
public ServerWebExchangeArgumentResolver(ReactiveAdapterRegistry adapterRegistry) {
super(adapterRegistry);
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
return checkParameterTypeNoReactiveWrapper(parameter,
type -> ServerWebExchange.class.isAssignableFrom(type) ||
ServerHttpRequest.class.isAssignableFrom(type) ||
ServerHttpResponse.class.isAssignableFrom(type) ||
HttpMethod.class == type ||
Locale.class == type ||
TimeZone.class == type ||
ZoneId.class == type ||
UriBuilder.class == type || UriComponentsBuilder.class == type);
}
@Override
public Object resolveArgumentValue(
MethodParameter methodParameter, BindingContext context, ServerWebExchange exchange) {
Class paramType = methodParameter.getParameterType();
if (ServerWebExchange.class.isAssignableFrom(paramType)) {
return exchange;
}
else if (ServerHttpRequest.class.isAssignableFrom(paramType)) {
return exchange.getRequest();
}
else if (ServerHttpResponse.class.isAssignableFrom(paramType)) {
return exchange.getResponse();
}
else if (HttpMethod.class == paramType) {
return exchange.getRequest().getMethod();
}
else if (Locale.class == paramType) {
return exchange.getLocaleContext().getLocale();
}
else if (TimeZone.class == paramType) {
LocaleContext localeContext = exchange.getLocaleContext();
TimeZone timeZone = getTimeZone(localeContext);
return timeZone != null ? timeZone : TimeZone.getDefault();
}
else if (ZoneId.class == paramType) {
LocaleContext localeContext = exchange.getLocaleContext();
TimeZone timeZone = getTimeZone(localeContext);
return timeZone != null ? timeZone.toZoneId() : ZoneId.systemDefault();
}
else if (UriBuilder.class == paramType || UriComponentsBuilder.class == paramType) {
return UriComponentsBuilder.fromHttpRequest(exchange.getRequest());
}
else {
// should never happen...
throw new IllegalArgumentException("Unknown parameter type: " +
paramType + " in method: " + methodParameter.getMethod());
}
}
@Nullable
private TimeZone getTimeZone(LocaleContext localeContext) {
TimeZone timeZone = null;
if (localeContext instanceof TimeZoneAwareLocaleContext) {
timeZone = ((TimeZoneAwareLocaleContext) localeContext).getTimeZone();
}
return timeZone;
}
}