import java.util.ArrayList;
import java.util.Map;

public class StockTracker {
    Map151<String, Integer> positions;

    public StockTracker() {
        positions = new Map151<>();
    }

    public void track(String filename) {
        ArrayList<String[]> data = new ReadCSV().csvCollection(filename);
        System.out.println("trades read: " + data.size());
        for (String[] datum : data) {
            int newamt = Integer.parseInt(datum[1]);
            Integer oldVal = positions.get(datum[0]);
            if (oldVal != null)
                newamt += oldVal;
            positions.put(datum[0], newamt);
        }
    }

    public String toString() {
        return positions.toString();
    }
    
    public static void main(String[] args) {
        StockTracker st = new StockTracker();
        st.track("bigtrades.csv");
        System.out.println(st);
    }
}