/*
* Copyright 2002-2016 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.server.handler;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import reactor.core.publisher.Mono;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import org.springframework.web.server.WebHandler;
import org.springframework.web.server.ServerWebExchange;
/**
* WebHandler that delegates to a chain of {@link WebFilter} instances and then
* to the target {@link WebHandler}.
*
* @author Rossen Stoyanchev
*/
public class FilteringWebHandler extends WebHandlerDecorator {
private final List<WebFilter> filters;
public FilteringWebHandler(WebHandler targetHandler, WebFilter... filters) {
super(targetHandler);
this.filters = initList(filters);
}
private static List<WebFilter> initList(WebFilter[] list) {
return (list != null ? Collections.unmodifiableList(Arrays.asList(list)): Collections.emptyList());
}
/**
* Return a read-only list of the configured filters.
*/
public List<WebFilter> getFilters() {
return this.filters;
}
@Override
public Mono<Void> handle(ServerWebExchange exchange) {
return new DefaultWebFilterChain().filter(exchange);
}
private class DefaultWebFilterChain implements WebFilterChain {
private int index;
@Override
public Mono<Void> filter(ServerWebExchange exchange) {
if (this.index < filters.size()) {
WebFilter filter = filters.get(this.index++);
return filter.filter(exchange, this);
}
else {
return getDelegate().handle(exchange);
}
}
}
}