text: /**
   * Copyright (c) 2013-2020 Nikita Koksharov
   *
   * Licensed 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 org.redisson.codec;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import org.redisson.client.codec.BaseCodec;
  import org.redisson.client.codec.Codec;
  import org.redisson.client.handler.State;
  import org.redisson.client.protocol.Decoder;
  import org.redisson.client.protocol.Encoder;
  import org.xerial.snappy.Snappy;
  
  import java.io.IOException;
  
  /**
   * Google's Snappy compression codec.
   * Uses inner <code>Codec</code> to convert object to binary stream.
   * <code>FstCodec</code> used by default.
   * <p>
   * Based on <a href="https://github.com/xerial/snappy-java">https://github.com/xerial/snappy-java</a>
   *
   * @see org.redisson.codec.FstCodec
   *
   * @author Nikita Koksharov
   *
   */
  public class SnappyCodecV2 extends BaseCodec {
  
      private final Codec innerCodec;
  
      public SnappyCodecV2() {
          this(new MarshallingCodec());
      }
  
      public SnappyCodecV2(Codec innerCodec) {
          this.innerCodec = innerCodec;
      }
  
      public SnappyCodecV2(ClassLoader classLoader) {
          this(new MarshallingCodec(classLoader));
      }
      
      public SnappyCodecV2(ClassLoader classLoader, SnappyCodecV2 codec) throws ReflectiveOperationException {
          this(copy(classLoader, codec.innerCodec));
      }
      
      private final Decoder<Object> decoder = new Decoder<Object>() {
          
          @Override
          public Object decode(ByteBuf buf, State state) throws IOException {
              byte[] bytes = new byte[buf.readableBytes()];
              buf.readBytes(bytes);
              bytes = Snappy.uncompress(bytes);
              ByteBuf bf = Unpooled.wrappedBuffer(bytes);
              try {
                  return innerCodec.getValueDecoder().decode(bf, state);
              } finally {
                  bf.release();
              }
          }
      };
  
      private final Encoder encoder = new Encoder() {
  
          @Override
          public ByteBuf encode(Object in) throws IOException {
              ByteBuf encoded = innerCodec.getValueEncoder().encode(in);
              byte[] bytes = new byte[encoded.readableBytes()];
              encoded.readBytes(bytes);
              encoded.release();
              byte[] res = Snappy.compress(bytes);
              return Unpooled.wrappedBuffer(res);
          }
      };
  
      @Override
      public Decoder<Object> getValueDecoder() {
          return decoder;
      }
  
      @Override
      public Encoder getValueEncoder() {
          return encoder;
      }
      
  }
  