EfficientRater.java

/**
 * Write a description of class EfficientRater here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
import java.util.HashMap;
import java.util.ArrayList;

public class EfficientRater implements Rater
{
    private String myID;
    private HashMap<String,Rating> myRatings;

    public EfficientRater(String id) {
        myID = id;
        myRatings = new HashMap<String,Rating>();
    }

    public void addRating(String item, double rating) {
        myRatings.put(item, new Rating(item, rating));
    }

    public boolean hasRating(String item) {
        return myRatings.containsKey(item);
    }

    public String getID() {
        return myID;
    }

    public double getRating(String item) {
        
        if (myRatings.containsKey(item)) {
            return myRatings.get(item).getValue();
        }
        else {
            return -1;
        }

    }

    public int numRatings() {
        return myRatings.size();
    }

    public ArrayList<String> getItemsRated() {
        ArrayList<String> list = new ArrayList<String>();
        for(String key : myRatings.keySet()){
            list.add(myRatings.get(key).getItem());
        }       
        return list;
    }
}