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package com.paritytrading.parity.net.pmr;

import static com.paritytrading.parity.net.pmr.PMR.*;

import com.paritytrading.nassau.MessageListener;
import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * A parser for inbound messages.
 */
public class PMRParser implements MessageListener {

    private Order  order;
    private Cancel cancel;
    private Trade  trade;

    private PMRListener listener;

    /**
     * Create a parser for inbound messages.
     *
     * @param listener the message listener
     */
    public PMRParser(PMRListener listener) {
        this.order  = new Order();
        this.cancel = new Cancel();
        this.trade  = new Trade();

        this.listener = listener;
    }

    @Override
    public void message(ByteBuffer buffer) throws IOException {
        byte messageType = buffer.get();

        switch (messageType) {
        case MESSAGE_TYPE_ORDER:
            order.get(buffer);
            listener.order(order);
            break;
        case MESSAGE_TYPE_CANCEL:
            cancel.get(buffer);
            listener.cancel(cancel);
            break;
        case MESSAGE_TYPE_TRADE:
            trade.get(buffer);
            listener.trade(trade);
            break;
        default:
            throw new PMRException("Unknown message type: " + (char)messageType);
        }
    }

}