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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:
*
* 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 net.dreamlu.iot.mqtt.codec;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
/**
* Mqtt version specific constant values used by multiple classes in mqtt-codec.
*
* @author netty
*/
public enum MqttVersion {
/**
* mqtt 协议
*/
MQTT_3_1("MQIsdp", (byte) 3, "MQTT 3.1"),
MQTT_3_1_1("MQTT", (byte) 4, "MQTT 3.1.1"),
MQTT_5("MQTT", (byte) 5, "MQTT 5.0");
private final String name;
private final byte level;
private final String fullName;
MqttVersion(String protocolName, byte protocolLevel, String fullName) {
this.name = Objects.requireNonNull(protocolName, "protocolName is null.");
this.level = protocolLevel;
this.fullName = fullName;
}
public String protocolName() {
return name;
}
public byte[] protocolNameBytes() {
return name.getBytes(StandardCharsets.UTF_8);
}
public byte protocolLevel() {
return level;
}
public String fullName() {
return fullName;
}
public static MqttVersion fromProtocolNameAndLevel(String protocolName, byte protocolLevel) {
MqttVersion mv;
switch (protocolLevel) {
case 3:
mv = MQTT_3_1;
break;
case 4:
mv = MQTT_3_1_1;
break;
case 5:
mv = MQTT_5;
break;
default:
throw new MqttUnacceptableProtocolVersionException(protocolName + " is an unknown protocol name");
}
if (mv.name.equals(protocolName)) {
return mv;
}
throw new MqttUnacceptableProtocolVersionException(protocolName + " and " + protocolLevel + " don't match");
}
}