/*
 * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.openflowjava.protocol.impl.deserialization;

import io.netty.buffer.ByteBuf;

import org.opendaylight.openflowjava.protocol.impl.util.EncodeConstants;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author michal.polkorab
 * @author timotej.kubas
 */
public abstract class DeserializationFactory {
    
    private static final Logger LOGGER = LoggerFactory
            .getLogger(DeserializationFactory.class);

    /**
     * Transforms ByteBuf into correct POJO message
     * @param rawMessage 
     * @param version version decoded from OpenFlow protocol message
     * @return correct POJO as DataObject
     */
    public static DataObject bufferToMessage(ByteBuf rawMessage, short version) {
        DataObject dataObject = null;
        short type = rawMessage.readUnsignedByte();
        rawMessage.skipBytes(EncodeConstants.SIZE_OF_SHORT_IN_BYTES);

        MessageTypeCodeKey msgTypeCodeKey = new MessageTypeCodeKey(version, type);
        OFDeserializer<?> decoder = DecoderTable.getInstance().getDecoder(msgTypeCodeKey);
        if (decoder != null) {
            dataObject = decoder.bufferToMessage(rawMessage, version);
        } else {
            LOGGER.warn("No correct decoder found in DecoderTable for arguments: " + msgTypeCodeKey.toString());
        }
        return dataObject;
    }
}