Java tutorial
/* * 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; public enum MqttQoS { AT_MOST_ONCE(0), AT_LEAST_ONCE(1), EXACTLY_ONCE(2), FAILURE(0x80); private final int value; MqttQoS(int value) { this.value = value; } public int value() { return value; } public static MqttQoS valueOf(int value) { for (MqttQoS q : values()) { if (q.value == value) { return q; } } throw new IllegalArgumentException("invalid QoS: " + value); } }