import java.io.IOException;

public class StockTracker {
    Map151Impl<String, Integer> positions;

    public StockTracker() {
        positions = new Map151Impl<>();
    }

    public void track(String filename) {
        ReadCSV csvReader;
        try {
            csvReader = new ReadCSV(filename, 4000);
        }
        catch (IOException ioe) {
            System.err.println("Ending. Cannot read. " + ioe.toString());
            return;
        }

        for (String[] datum : csvReader) {
            int newamt = Integer.parseInt(datum[1]);
            Integer oldVal = positions.get(datum[0]);
            if (oldVal != null)
                newamt += oldVal;
            positions.put(datum[0], newamt);
        }
        System.out.println(positions);
    }

    public static void main(String[] args) {
        StockTracker st = new StockTracker();
        st.track("./trades.txt");
    }

}