/*
* 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.function.server;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Stream;
import org.springframework.http.codec.CodecConfigurer;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.util.Assert;
import org.springframework.web.reactive.result.view.ViewResolver;
import org.springframework.web.server.WebExceptionHandler;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.handler.ResponseStatusExceptionHandler;
/**
* Default implementation of {@link HandlerStrategies.Builder}.
*
* @author Arjen Poutsma
* @since 5.0
*/
class DefaultHandlerStrategiesBuilder implements HandlerStrategies.Builder {
static final Function<ServerRequest, Optional<Locale>> DEFAULT_LOCALE_RESOLVER =
request -> request.headers().acceptLanguage().stream()
.map(Locale.LanguageRange::getRange)
.map(Locale::forLanguageTag).findFirst();
private final ServerCodecConfigurer codecConfigurer = ServerCodecConfigurer.create();
private final List<ViewResolver> viewResolvers = new ArrayList<>();
private Function<ServerRequest, Optional<Locale>> localeResolver;
private final List<WebFilter> webFilters = new ArrayList<>();
private final List<WebExceptionHandler> exceptionHandlers = new ArrayList<>();
public DefaultHandlerStrategiesBuilder() {
this.codecConfigurer.registerDefaults(false);
}
public void defaultConfiguration() {
this.codecConfigurer.registerDefaults(true);
localeResolver(DEFAULT_LOCALE_RESOLVER);
exceptionHandler(new ResponseStatusExceptionHandler());
}
@Override
public HandlerStrategies.Builder defaultCodecs(
Consumer<ServerCodecConfigurer.ServerDefaultCodecsConfigurer> consumer) {
Assert.notNull(consumer, "'consumer' must not be null");
consumer.accept(this.codecConfigurer.defaultCodecs());
return this;
}
@Override
public HandlerStrategies.Builder customCodecs(
Consumer<CodecConfigurer.CustomCodecsConfigurer> consumer) {
Assert.notNull(consumer, "'consumer' must not be null");
consumer.accept(this.codecConfigurer.customCodecs());
return this;
}
@Override
public HandlerStrategies.Builder viewResolver(ViewResolver viewResolver) {
Assert.notNull(viewResolver, "'viewResolver' must not be null");
this.viewResolvers.add(viewResolver);
return this;
}
@Override
public HandlerStrategies.Builder localeResolver(Function<ServerRequest, Optional<Locale>> localeResolver) {
Assert.notNull(localeResolver, "'localeResolver' must not be null");
this.localeResolver = localeResolver;
return this;
}
@Override
public HandlerStrategies.Builder webFilter(WebFilter filter) {
Assert.notNull(filter, "'filter' must not be null");
this.webFilters.add(filter);
return this;
}
@Override
public HandlerStrategies.Builder exceptionHandler(WebExceptionHandler exceptionHandler) {
Assert.notNull(exceptionHandler, "'exceptionHandler' must not be null");
this.exceptionHandlers.add(exceptionHandler);
return this;
}
@Override
public HandlerStrategies build() {
return new DefaultHandlerStrategies(this.codecConfigurer.getReaders(),
this.codecConfigurer.getWriters(), this.viewResolvers, this.localeResolver,
this.webFilters, this.exceptionHandlers);
}
private static class DefaultHandlerStrategies implements HandlerStrategies {
private final List<HttpMessageReader<?>> messageReaders;
private final List<HttpMessageWriter<?>> messageWriters;
private final List<ViewResolver> viewResolvers;
private final Function<ServerRequest, Optional<Locale>> localeResolver;
private final List<WebFilter> webFilters;
private final List<WebExceptionHandler> exceptionHandlers;
public DefaultHandlerStrategies(
List<HttpMessageReader<?>> messageReaders,
List<HttpMessageWriter<?>> messageWriters,
List<ViewResolver> viewResolvers,
Function<ServerRequest, Optional<Locale>> localeResolver,
List<WebFilter> webFilters,
List<WebExceptionHandler> exceptionHandlers) {
this.messageReaders = unmodifiableCopy(messageReaders);
this.messageWriters = unmodifiableCopy(messageWriters);
this.viewResolvers = unmodifiableCopy(viewResolvers);
this.localeResolver = localeResolver;
this.webFilters = unmodifiableCopy(webFilters);
this.exceptionHandlers = unmodifiableCopy(exceptionHandlers);
}
private static <T> List<T> unmodifiableCopy(List<? extends T> list) {
return Collections.unmodifiableList(new ArrayList<>(list));
}
@Override
public Supplier<Stream<HttpMessageReader<?>>> messageReaders() {
return this.messageReaders::stream;
}
@Override
public Supplier<Stream<HttpMessageWriter<?>>> messageWriters() {
return this.messageWriters::stream;
}
@Override
public Supplier<Stream<ViewResolver>> viewResolvers() {
return this.viewResolvers::stream;
}
@Override
public Supplier<Function<ServerRequest, Optional<Locale>>> localeResolver() {
return () -> this.localeResolver;
}
@Override
public Supplier<Stream<WebFilter>> webFilters() {
return this.webFilters::stream;
}
@Override
public Supplier<Stream<WebExceptionHandler>> exceptionHandlers() {
return this.exceptionHandlers::stream;
}
}
}