/*
 * 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Mono;

import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebExceptionHandler;

/**
 * Handle {@link ResponseStatusException} by setting the response status.
 *
 * @author Rossen Stoyanchev
 * @author Sebastien Deleuze
 * @since 5.0
 */
public class ResponseStatusExceptionHandler implements WebExceptionHandler {

	private static final Log logger = LogFactory.getLog(ResponseStatusExceptionHandler.class);

	@Override
	public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
		if (ex instanceof ResponseStatusException) {
			exchange.getResponse().setStatusCode(((ResponseStatusException) ex).getStatus());
			if (ex.getMessage() != null) {
				logger.error(ex.getMessage());
			}
			return Mono.empty();
		}
		return Mono.error(ex);
	}

}
