import java.io.File;
import java.util.ArrayList;
import java.util.Scanner;


/**
* Abstract sort class.
* @author cs416
* @version 1
*/
public abstract class Sort {
    ArrayList<Sample> samples = new ArrayList<>();

    /**
    * Constuctor - opens the passed in filename parameter, parses into
    * Sample objects and adds to internal collection.
    * @param fileName The filename to open
    */
    public Sort(String fileName) {
        try {
            Scanner s = new Scanner(new File(fileName));
            while (s.hasNextLine()) {
                Scanner line = new Scanner(s.nextLine());
                samples.add(new Sample(line.nextInt(), line.nextDouble()));
            }
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
    }

    /**
    * toString - returns the string format of this Sort object.
    * @return String
    */
    public String toString() {
        if (samples.size() == 0) {
            return "[]";
        }

        String retVal = "[";
        for (Sample s : samples) {
            retVal += s.toString() + ",";
        }
        return retVal.substring(0, retVal.length() - 1) + "]";
    }


    /**
    * Sort samples by default in descending order based on
    * measurement.
    */
    public abstract void sort();

}