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   /*
    * Copyright 2012 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.socks;
  
  import io.netty.util.internal.ObjectUtil;
  
  /**
   * An abstract class that defines a SocksRequest, providing common properties for
   * {@link SocksInitRequest}, {@link SocksAuthRequest}, {@link SocksCmdRequest} and {@link UnknownSocksRequest}.
   *
   * @see SocksInitRequest
   * @see SocksAuthRequest
   * @see SocksCmdRequest
   * @see UnknownSocksRequest
   */
  public abstract class SocksRequest extends SocksMessage {
      private final SocksRequestType requestType;
  
      protected SocksRequest(SocksRequestType requestType) {
          super(SocksMessageType.REQUEST);
          this.requestType = ObjectUtil.checkNotNull(requestType, "requestType");
      }
  
      /**
       * Returns socks request type
       *
       * @return socks request type
       */
      public SocksRequestType requestType() {
          return requestType;
      }
  }