/*
    * 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;
  
  /**
   * See <a href="https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#unsuback">
   *     MQTTV3.1/unsuback</a>
   */
  public final class MqttUnsubAckMessage extends MqttMessage {
  
      public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
                                 MqttMessageIdAndPropertiesVariableHeader variableHeader,
                                 MqttUnsubAckPayload payload) {
          super(mqttFixedHeader, variableHeader, MqttUnsubAckPayload.withEmptyDefaults(payload));
      }
  
      public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
                                 MqttMessageIdVariableHeader variableHeader,
                                 MqttUnsubAckPayload payload) {
          this(mqttFixedHeader, fallbackVariableHeader(variableHeader), payload);
      }
      public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
                                 MqttMessageIdVariableHeader variableHeader) {
          this(mqttFixedHeader, variableHeader, null);
      }
  
      private static MqttMessageIdAndPropertiesVariableHeader fallbackVariableHeader(
              MqttMessageIdVariableHeader variableHeader) {
          if (variableHeader instanceof MqttMessageIdAndPropertiesVariableHeader) {
              return (MqttMessageIdAndPropertiesVariableHeader) variableHeader;
          }
          return new MqttMessageIdAndPropertiesVariableHeader(variableHeader.messageId(), MqttProperties.NO_PROPERTIES);
      }
  
      @Override
      public MqttMessageIdVariableHeader variableHeader() {
          return (MqttMessageIdVariableHeader) super.variableHeader();
      }
  
      public MqttMessageIdAndPropertiesVariableHeader idAndPropertiesVariableHeader() {
          return (MqttMessageIdAndPropertiesVariableHeader) super.variableHeader();
      }
  
      @Override
      public MqttUnsubAckPayload payload() {
          return (MqttUnsubAckPayload) super.payload();
      }
  }