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   /*
    * Copyright 2022 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.channel.unix;
  
  
  import io.netty.util.internal.ObjectUtil;
  
  import java.nio.ByteBuffer;
  
  /**
   * A {@link GenericUnixChannelOption} which uses an {@link ByteBuffer} as {@code optval}. The user is responsible
   * to fill the {@link ByteBuffer} in a correct manner, so it works with the {@param level} and {@param optname}.
   */
  public final class RawUnixChannelOption extends GenericUnixChannelOption<ByteBuffer> {
  
      private final int length;
  
      /**
       * Creates a new instance.
       *
       * @param name      the name that is used.
       * @param level     the level.
       * @param length    the expected length of the optvalue.
       * @param optname   the optname.
       */
      public RawUnixChannelOption(String name, int level, int optname, int length) {
          super(name, level, optname);
          this.length = ObjectUtil.checkPositive(length, "length");
      }
  
      /**
       * The length of the optval.
       *
       * @return the length.
       */
      public int length() {
          return length;
      }
  
      @Override
      public void validate(ByteBuffer value) {
          super.validate(value);
          if (value.remaining() != length) {
              throw new IllegalArgumentException("Length of value does not match. Expected "
                      + length + ", but got " + value.remaining());
          }
      }
  }