/*
    * 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;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Return Code of [email protected] MqttConnAckMessage}
   */
  public enum MqttConnectReturnCode {
      CONNECTION_ACCEPTED((byte) 0x00),
      CONNECTION_REFUSED_UNACCEPTABLE_PROTOCOL_VERSION((byte) 0X01),
      CONNECTION_REFUSED_IDENTIFIER_REJECTED((byte) 0x02),
      CONNECTION_REFUSED_SERVER_UNAVAILABLE((byte) 0x03),
      CONNECTION_REFUSED_BAD_USER_NAME_OR_PASSWORD((byte) 0x04),
      CONNECTION_REFUSED_NOT_AUTHORIZED((byte) 0x05);
  
      private static final Map<Byte, MqttConnectReturnCode> VALUE_TO_CODE_MAP;
  
      static {
          final Map<Byte, MqttConnectReturnCode> valueMap = new HashMap<Byte, MqttConnectReturnCode>();
          for (MqttConnectReturnCode code: values()) {
              valueMap.put(code.byteValue, code);
          }
          VALUE_TO_CODE_MAP = Collections.unmodifiableMap(valueMap);
      }
  
      private final byte byteValue;
  
      MqttConnectReturnCode(byte byteValue) {
          this.byteValue = byteValue;
      }
  
      public byte byteValue() {
          return byteValue;
      }
  
      public static MqttConnectReturnCode valueOf(byte b) {
          if (VALUE_TO_CODE_MAP.containsKey(b)) {
              return VALUE_TO_CODE_MAP.get(b);
          }
          throw new IllegalArgumentException("unknown connect return code: " + (b & 0xFF));
      }
  }