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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.buffer.ByteBuf;
  import io.netty.buffer.DefaultByteBufHolder;
  import io.netty.buffer.Unpooled;
  import io.netty.util.internal.StringUtil;
  import io.netty.util.internal.UnstableApi;
  
  /**
   * An aggregated bulk string of <a href="https://redis.io/topics/protocol">RESP</a>.
   */
  @UnstableApi
  public class FullBulkStringRedisMessage extends DefaultByteBufHolder implements LastBulkStringRedisContent {
  
      private FullBulkStringRedisMessage() {
          this(Unpooled.EMPTY_BUFFER);
      }
  
      /**
       * Creates a {@link FullBulkStringRedisMessage} for the given {@code content}.
       *
       * @param content the content, must not be {@code null}. If content is null or empty,
       * use {@link FullBulkStringRedisMessage#NULL_INSTANCE} or {@link FullBulkStringRedisMessage#EMPTY_INSTANCE}
       * instead of constructor.
       */
      public FullBulkStringRedisMessage(ByteBuf content) {
          super(content);
      }
  
      /**
       * 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 false;
      }
  
      @Override
      public String toString() {
          return new StringBuilder(StringUtil.simpleClassName(this))
                  .append('[')
                  .append("content=")
                  .append(content())
                  .append(']').toString();
      }
  
      /**
       * A predefined null instance of {@link FullBulkStringRedisMessage}.
       */
      public static final FullBulkStringRedisMessage NULL_INSTANCE = new FullBulkStringRedisMessage() {
          @Override
          public boolean isNull() {
              return true;
          }
  
          @Override
          public ByteBuf content() {
              return Unpooled.EMPTY_BUFFER;
          }
  
          @Override
          public FullBulkStringRedisMessage copy() {
              return this;
          }
  
          @Override
          public FullBulkStringRedisMessage duplicate() {
              return this;
          }
  
          @Override
          public FullBulkStringRedisMessage retainedDuplicate() {
              return this;
          }
  
          @Override
          public int refCnt() {
              return 1;
          }
  
          @Override
          public FullBulkStringRedisMessage retain() {
              return this;
         }
 
         @Override
         public FullBulkStringRedisMessage retain(int increment) {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage touch() {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage touch(Object hint) {
             return this;
         }
 
         @Override
         public boolean release() {
             return false;
         }
 
         @Override
         public boolean release(int decrement) {
             return false;
         }
     };
 
     /**
      * A predefined empty instance of {@link FullBulkStringRedisMessage}.
      */
     public static final FullBulkStringRedisMessage EMPTY_INSTANCE = new FullBulkStringRedisMessage() {
         @Override
         public ByteBuf content() {
             return Unpooled.EMPTY_BUFFER;
         }
 
         @Override
         public FullBulkStringRedisMessage copy() {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage duplicate() {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage retainedDuplicate() {
             return this;
         }
 
         @Override
         public int refCnt() {
             return 1;
         }
 
         @Override
         public FullBulkStringRedisMessage retain() {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage retain(int increment) {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage touch() {
             return this;
         }
 
         @Override
         public FullBulkStringRedisMessage touch(Object hint) {
             return this;
         }
 
         @Override
         public boolean release() {
             return false;
         }
 
         @Override
         public boolean release(int decrement) {
             return false;
         }
     };
 
     @Override
     public FullBulkStringRedisMessage copy() {
         return (FullBulkStringRedisMessage) super.copy();
     }
 
     @Override
     public FullBulkStringRedisMessage duplicate() {
         return (FullBulkStringRedisMessage) super.duplicate();
     }
 
     @Override
     public FullBulkStringRedisMessage retainedDuplicate() {
         return (FullBulkStringRedisMessage) super.retainedDuplicate();
     }
 
     @Override
     public FullBulkStringRedisMessage replace(ByteBuf content) {
         return new FullBulkStringRedisMessage(content);
     }
 
     @Override
     public FullBulkStringRedisMessage retain() {
         super.retain();
         return this;
     }
 
     @Override
     public FullBulkStringRedisMessage retain(int increment) {
         super.retain(increment);
         return this;
     }
 
     @Override
     public FullBulkStringRedisMessage touch() {
         super.touch();
         return this;
     }
 
     @Override
     public FullBulkStringRedisMessage touch(Object hint) {
         super.touch(hint);
         return this;
     }
 }