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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.codec.haproxy;

import static io.netty.handler.codec.haproxy.HAProxyConstants.*;

/**
 * The HAProxy proxy protocol specification version.
 */
public enum HAProxyProtocolVersion {
    /**
     * The ONE proxy protocol version represents a version 1 (human-readable) header.
     */
    V1(VERSION_ONE_BYTE),
    /**
     * The TWO proxy protocol version represents a version 2 (binary) header.
     */
    V2(VERSION_TWO_BYTE);

    /**
     * The highest 4 bits of the protocol version and command byte contain the version
     */
    private static final byte VERSION_MASK = (byte) 0xf0;

    private final byte byteValue;

    /**
     * Creates a new instance
     */
    HAProxyProtocolVersion(byte byteValue) {
        this.byteValue = byteValue;
    }

    /**
     * Returns the {@link HAProxyProtocolVersion} represented by the higest 4 bits of the specified byte.
     *
     * @param verCmdByte protocol version and command byte
     */
    public static HAProxyProtocolVersion valueOf(byte verCmdByte) {
        int version = verCmdByte & VERSION_MASK;
        switch ((byte) version) {
            case VERSION_TWO_BYTE:
                return V2;
            case VERSION_ONE_BYTE:
                return V1;
            default:
                throw new IllegalArgumentException("unknown version: " + version);
        }
    }

    /**
     * Returns the byte value of this version.
     */
    public byte byteValue() {
        return byteValue;
    }
}