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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty.handler.codec.mqtt;
18  
19  /**
20   * See <a href="https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#unsuback">
21   *     MQTTV3.1/unsuback</a>
22   */
23  public final class MqttUnsubAckMessage extends MqttMessage {
24  
25      public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
26                                 MqttMessageIdAndPropertiesVariableHeader variableHeader,
27                                 MqttUnsubAckPayload payload) {
28          super(mqttFixedHeader, variableHeader, MqttUnsubAckPayload.withEmptyDefaults(payload));
29      }
30  
31      public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
32                                 MqttMessageIdVariableHeader variableHeader,
33                                 MqttUnsubAckPayload payload) {
34          this(mqttFixedHeader, fallbackVariableHeader(variableHeader), payload);
35      }
36      public MqttUnsubAckMessage(MqttFixedHeader mqttFixedHeader,
37                                 MqttMessageIdVariableHeader variableHeader) {
38          this(mqttFixedHeader, variableHeader, null);
39      }
40  
41      private static MqttMessageIdAndPropertiesVariableHeader fallbackVariableHeader(
42              MqttMessageIdVariableHeader variableHeader) {
43          if (variableHeader instanceof MqttMessageIdAndPropertiesVariableHeader) {
44              return (MqttMessageIdAndPropertiesVariableHeader) variableHeader;
45          }
46          return new MqttMessageIdAndPropertiesVariableHeader(variableHeader.messageId(), MqttProperties.NO_PROPERTIES);
47      }
48  
49      @Override
50      public MqttMessageIdVariableHeader variableHeader() {
51          return (MqttMessageIdVariableHeader) super.variableHeader();
52      }
53  
54      public MqttMessageIdAndPropertiesVariableHeader idAndPropertiesVariableHeader() {
55          return (MqttMessageIdAndPropertiesVariableHeader) super.variableHeader();
56      }
57  
58      @Override
59      public MqttUnsubAckPayload payload() {
60          return (MqttUnsubAckPayload) super.payload();
61      }
62  }