content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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
   *
   *     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.apache.cassandra.transport.messages;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import io.netty.buffer.ByteBuf;
  import org.apache.cassandra.transport.Message;
  import org.apache.cassandra.transport.ProtocolException;
  import org.apache.cassandra.transport.ProtocolVersion;
  
  /**
   * Catch-all codec for any unsupported legacy messages.
   */
  public class UnsupportedMessageCodec <T extends Message> implements Message.Codec<T>
  {
      public final static UnsupportedMessageCodec instance = new UnsupportedMessageCodec();
  
      private static final Logger logger = LoggerFactory.getLogger(UnsupportedMessageCodec.class);
  
      public T decode(ByteBuf body, ProtocolVersion version)
      {
          if (ProtocolVersion.SUPPORTED.contains(version))
          {
              logger.error("Received invalid message for supported protocol version {}", version);
          }
          throw new ProtocolException("Unsupported message");
      }
  
      public void encode(T t, ByteBuf dest, ProtocolVersion version)
      {
          throw new ProtocolException("Unsupported message");
      }
  
      public int encodedSize(T t, ProtocolVersion version)
      {
          return 0;
      }
  }
  