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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;

/**
 * The command of an HAProxy proxy protocol header
 */
public enum HAProxyCommand {
    /**
     * The LOCAL command represents a connection that was established on purpose by the proxy
     * without being relayed.
     */
    LOCAL(HAProxyConstants.COMMAND_LOCAL_BYTE),
    /**
     * The PROXY command represents a connection that was established on behalf of another node,
     * and reflects the original connection endpoints.
     */
    PROXY(HAProxyConstants.COMMAND_PROXY_BYTE);

    /**
     * The command is specified in the lowest 4 bits of the protocol version and command byte
     */
    private static final byte COMMAND_MASK = 0x0f;

    private final byte byteValue;

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

    /**
     * Returns the {@link HAProxyCommand} represented by the lowest 4 bits of the specified byte.
     *
     * @param verCmdByte protocol version and command byte
     */
    public static HAProxyCommand valueOf(byte verCmdByte) {
        int cmd = verCmdByte & COMMAND_MASK;
        switch ((byte) cmd) {
            case HAProxyConstants.COMMAND_PROXY_BYTE:
                return PROXY;
            case HAProxyConstants.COMMAND_LOCAL_BYTE:
                return LOCAL;
            default:
                throw new IllegalArgumentException("unknown command: " + cmd);
        }
    }

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