io.netty.handler.codec.mqtt.MqttVersion 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.mqtt;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.ObjectUtil;
/**
* Mqtt version specific constant values used by multiple classes in mqtt-codec.
*/
public enum MqttVersion {
MQTT_3_1("MQIsdp", (byte) 3),
MQTT_3_1_1("MQTT", (byte) 4);
private final String name;
private final byte level;
MqttVersion(String protocolName, byte protocolLevel) {
name = ObjectUtil.checkNotNull(protocolName, "protocolName");
level = protocolLevel;
}
public String protocolName() {
return name;
}
public byte[] protocolNameBytes() {
return name.getBytes(CharsetUtil.UTF_8);
}
public byte protocolLevel() {
return level;
}
public static MqttVersion fromProtocolNameAndLevel(String protocolName, byte protocolLevel) {
for (MqttVersion mv : values()) {
if (mv.name.equals(protocolName)) {
if (mv.level == protocolLevel) {
return mv;
} else {
throw new MqttUnacceptableProtocolVersionException(protocolName + " and " +
protocolLevel + " are not match");
}
}
}
throw new MqttUnacceptableProtocolVersionException(protocolName + "is unknown protocol name");
}
}