71 lines
2.1 KiB
Java
71 lines
2.1 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.haproxy;
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import static io.netty.handler.codec.haproxy.HAProxyConstants.*;
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/**
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* The HAProxy proxy protocol specification version.
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*/
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public enum HAProxyProtocolVersion {
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/**
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* The ONE proxy protocol version represents a version 1 (human-readable) header.
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*/
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V1(VERSION_ONE_BYTE),
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/**
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* The TWO proxy protocol version represents a version 2 (binary) header.
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*/
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V2(VERSION_TWO_BYTE);
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/**
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* The highest 4 bits of the protocol version and command byte contain the version
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*/
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private static final byte VERSION_MASK = (byte) 0xf0;
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private final byte byteValue;
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/**
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* Creates a new instance
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*/
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HAProxyProtocolVersion(byte byteValue) {
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this.byteValue = byteValue;
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}
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/**
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* Returns the {@link HAProxyProtocolVersion} represented by the highest 4 bits of the specified byte.
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*
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* @param verCmdByte protocol version and command byte
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*/
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public static HAProxyProtocolVersion valueOf(byte verCmdByte) {
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int version = verCmdByte & VERSION_MASK;
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switch ((byte) version) {
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case VERSION_TWO_BYTE:
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return V2;
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case VERSION_ONE_BYTE:
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return V1;
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default:
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throw new IllegalArgumentException("unknown version: " + version);
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}
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}
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/**
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* Returns the byte value of this version.
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*/
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public byte byteValue() {
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return byteValue;
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}
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}
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