org.springframework.web.server.handler.DefaultWebFilterChain 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.server.handler;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import reactor.core.publisher.Mono;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import org.springframework.web.server.WebHandler;
/**
* Default implementation of {@link WebFilterChain}.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public class DefaultWebFilterChain implements WebFilterChain {
private final List filters;
private final WebHandler handler;
private final int index;
public DefaultWebFilterChain(WebHandler handler, WebFilter... filters) {
Assert.notNull(handler, "WebHandler is required");
this.filters = ObjectUtils.isEmpty(filters) ? Collections.emptyList() : Arrays.asList(filters);
this.handler = handler;
this.index = 0;
}
private DefaultWebFilterChain(DefaultWebFilterChain parent, int index) {
this.filters = parent.getFilters();
this.handler = parent.getHandler();
this.index = index;
}
public List getFilters() {
return this.filters;
}
public WebHandler getHandler() {
return this.handler;
}
@Override
public Mono filter(ServerWebExchange exchange) {
return Mono.defer(() -> {
if (this.index < this.filters.size()) {
WebFilter filter = this.filters.get(this.index);
WebFilterChain chain = new DefaultWebFilterChain(this, this.index + 1);
return filter.filter(exchange, chain);
}
else {
return this.handler.handle(exchange);
}
});
}
}