io.netty.handler.codec.haproxy.HAProxyProtocolVersion Maven / Gradle / Ivy
/*
* 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:
*
* 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.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 highest 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;
}
}