/*
    * 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 io.netty.handler.codec.mqtt;
  
  /**
   * MQTT Message Types.
   */
  public enum MqttMessageType {
      CONNECT(1),
      CONNACK(2),
      PUBLISH(3),
      PUBACK(4),
      PUBREC(5),
      PUBREL(6),
      PUBCOMP(7),
      SUBSCRIBE(8),
      SUBACK(9),
      UNSUBSCRIBE(10),
      UNSUBACK(11),
      PINGREQ(12),
      PINGRESP(13),
      DISCONNECT(14),
      AUTH(15);
  
      private static final MqttMessageType[] VALUES;
  
      static {
          // this prevent values to be assigned with the wrong order
          // and ensure valueOf to work fine
          final MqttMessageType[] values = values();
          VALUES = new MqttMessageType[values.length + 1];
          for (MqttMessageType mqttMessageType : values) {
              final int value = mqttMessageType.value;
              if (VALUES[value] != null) {
                  throw new AssertionError("value already in use: " + value);
              }
              VALUES[value] = mqttMessageType;
          }
      }
  
      private final int value;
  
      MqttMessageType(int value) {
          this.value = value;
      }
  
      public int value() {
          return value;
      }
  
      public static MqttMessageType valueOf(int type) {
          if (type <= 0 || type >= VALUES.length) {
              throw new IllegalArgumentException("unknown message type: " + type);
          }
          return VALUES[type];
      }
  }