cassandra-trunk/src/java/org/apache/cassandra/transport/messages/UnsupportedMessageCodec.java
/*
 * 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;
    }
}
