e8efcd82a8
Motivation: We can just use Objects.requireNonNull(...) as a replacement for ObjectUtil.checkNotNull(....) Modifications: - Use Objects.requireNonNull(...) Result: Less code to maintain.
64 lines
1.9 KiB
Java
64 lines
1.9 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.mqtt;
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import static java.util.Objects.requireNonNull;
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import io.netty.util.CharsetUtil;
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/**
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* Mqtt version specific constant values used by multiple classes in mqtt-codec.
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*/
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public enum MqttVersion {
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MQTT_3_1("MQIsdp", (byte) 3),
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MQTT_3_1_1("MQTT", (byte) 4);
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private final String name;
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private final byte level;
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MqttVersion(String protocolName, byte protocolLevel) {
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name = requireNonNull(protocolName, "protocolName");
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level = protocolLevel;
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}
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public String protocolName() {
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return name;
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}
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public byte[] protocolNameBytes() {
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return name.getBytes(CharsetUtil.UTF_8);
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}
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public byte protocolLevel() {
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return level;
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}
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public static MqttVersion fromProtocolNameAndLevel(String protocolName, byte protocolLevel) {
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for (MqttVersion mv : values()) {
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if (mv.name.equals(protocolName)) {
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if (mv.level == protocolLevel) {
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return mv;
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} else {
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throw new MqttUnacceptableProtocolVersionException(protocolName + " and " +
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protocolLevel + " are not match");
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}
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}
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}
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throw new MqttUnacceptableProtocolVersionException(protocolName + "is unknown protocol name");
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}
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}
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