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   /*
    * Copyright 2016 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.redis;
  
  import io.netty.util.internal.UnstableApi;
  
  /**
   * The header of Bulk Strings in <a href="https://redis.io/topics/protocol">RESP</a>.
   */
  @UnstableApi
  public class BulkStringHeaderRedisMessage implements RedisMessage {
  
      private final int bulkStringLength;
  
      /**
       * Creates a {@link BulkStringHeaderRedisMessage}.
       *
       * @param bulkStringLength follow content length.
       */
      public BulkStringHeaderRedisMessage(int bulkStringLength) {
          if (bulkStringLength <= 0) {
              throw new RedisCodecException("bulkStringLength: " + bulkStringLength + " (expected: > 0)");
          }
          this.bulkStringLength = bulkStringLength;
      }
  
      /**
       * Return {@code bulkStringLength} for this content.
       */
      public final int bulkStringLength() {
          return bulkStringLength;
      }
  
      /**
       * Returns whether the content of this message is {@code null}.
       *
       * @return indicates whether the content of this message is {@code null}.
       */
      public boolean isNull() {
          return bulkStringLength == RedisConstants.NULL_VALUE;
      }
  }