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   /*
    * 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;
  
  import io.netty.util.internal.StringUtil;
  
  /**
   * Variable header of {@link MqttConnectMessage}
   */
  public final class MqttConnAckVariableHeader {
  
      private final MqttConnectReturnCode connectReturnCode;
  
      private final boolean sessionPresent;
  
      private final MqttProperties properties;
  
      public MqttConnAckVariableHeader(MqttConnectReturnCode connectReturnCode, boolean sessionPresent) {
          this(connectReturnCode, sessionPresent, MqttProperties.NO_PROPERTIES);
      }
  
      public MqttConnAckVariableHeader(MqttConnectReturnCode connectReturnCode, boolean sessionPresent,
                                       MqttProperties properties) {
          this.connectReturnCode = connectReturnCode;
          this.sessionPresent = sessionPresent;
          this.properties = MqttProperties.withEmptyDefaults(properties);
      }
  
      public MqttConnectReturnCode connectReturnCode() {
          return connectReturnCode;
      }
  
      public boolean isSessionPresent() {
          return sessionPresent;
      }
  
      public MqttProperties properties() {
          return properties;
      }
  
      @Override
      public String toString() {
          return new StringBuilder(StringUtil.simpleClassName(this))
              .append('[')
              .append("connectReturnCode=").append(connectReturnCode)
              .append(", sessionPresent=").append(sessionPresent)
              .append(']')
              .toString();
      }
  }