/***
 * Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
 * All rights reserved.
 *
 * 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 br.com.caelum.vraptor.controller;

import java.io.IOException;
import java.util.Set;

import javax.enterprise.context.ApplicationScoped;
import javax.servlet.http.HttpServletResponse;

import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.http.MutableRequest;
import br.com.caelum.vraptor.http.MutableResponse;

import com.google.common.base.Joiner;

/**
 * Default implementation which sets the header and send an error response.
 * @author guilherme
 *
 */
@ApplicationScoped
public class DefaultMethodNotAllowedHandler implements MethodNotAllowedHandler {

	@Override
	public void deny(MutableRequest request, MutableResponse response, Set<HttpMethod> allowedMethods) {
		response.addHeader("Allow", Joiner.on(", ").join(allowedMethods));
		try {
			if (!"OPTIONS".equalsIgnoreCase(request.getMethod())) {
				response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
			}
		} catch (IOException e) {
			throw new InterceptionException(e);
		}
	}
}