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Asynchronous PostgreSQL Java driver

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/*
 * 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 com.github.pgasync.impl.netty;

import com.github.pgasync.impl.io.*;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Decodes incoming bytes to PostgreSQL V3 protocol message instances.
 * 
 * @author Antti Laisi
 */
class ByteBufMessageDecoder extends ByteToMessageDecoder {

    static final Map> DECODERS = new HashMap<>();
    static {
        for (Decoder decoder : new Decoder[] { 
                new ErrorResponseDecoder(), 
                new AuthenticationDecoder(),
                new ReadyForQueryDecoder(), 
                new RowDescriptionDecoder(), 
                new CommandCompleteDecoder(),
                new DataRowDecoder(),
                new NotificationResponseDecoder() }) {
            DECODERS.put(decoder.getMessageId(), decoder);
        }
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List