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/*
 * Copyright 2017-2020 original 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
 *
 * https://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 io.micronaut.http.server.netty.handler.accesslog.element;

import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpHeaders;

import java.util.Set;

/**
 * RequestProtocolElement LogElement. The request protocol.
 *
 * @author croudet
 * @since 2.0
 */
final class RequestProtocolElement implements LogElement {
    /**
     * The request protocol marker.
     */
    public static final String REQUEST_PROTOCOL = "H";

    /**
     * The RequestProtocolElement instance.
     */
    static final RequestProtocolElement INSTANCE = new RequestProtocolElement();

    private RequestProtocolElement() {

    }

    @Override
    public LogElement copy() {
        return this;
    }

    @Override
    public String onRequestHeaders(SocketChannel channel, String method, HttpHeaders headers, String uri, String protocol) {
        return protocol;
    }

    @Override
    public Set events() {
        return Event.REQUEST_HEADERS_EVENTS;
    }

    @Override
    public String toString() {
        return 'H' + REQUEST_PROTOCOL;
    }
}