io.netty.handler.codec.haproxy.HAProxyCommand 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:
*
* 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;
}
}