Responder Tugas 5

import java.util.Random;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;

/**
 * The responder class represents a response-generator object.
 * It is used to generate an automatic response by randomly
 * selecting a phrase from a predefined list of responses.
 *
 * @author Muhammad Naufaldillah
 * @version 16 November 2020
 */
public class Responder
{
    private Random randomGenerator;
    private ArrayList<String> responses;
    private HashMap<String, String> responseMap;

    /**
     * Construct a Responder
     */
    public Responder()
    {
        randomGenerator = new Random();
        responses = new ArrayList<String>();
        responseMap = new HashMap<String, String>();
        fillResponses();
        fillResponseMap();
    }

    /**
     * Generate a response
     * @return  A string that should be displayed as the response
     */
    public String generateResponse(HashSet<String> words)
    {
        for(String word : words)
        {
            String response = responseMap.get(word);
            if(response != null)
            {
                return response;
            }
        }
        // Pick a random number for the index in the default response
        // list. The number will be between 0 (inclusive) and the size
        // of the list (exclusive).
        return pickDefaultResponse();
    }

    /**
     * Build up a list of default responses from which we can
     * pick one if we don't know what else to say.
     */
    private void fillResponses()
    {
        responses.add("That sounds odd. Could you describe \n" +
                      "that problem in more detail?");
        responses.add("No other customer has ever \n" +
                      "complained about this before. \n" +
                      "What is your system configuration?");
        responses.add("That’s a known problem with Vista." +
                      "Windows 7 is much better.");
        responses.add("I need a bit more information on that.");
        responses.add("Have you checked that you do not \n" +
                      "have a dll conflict?");
        responses.add("That is explained in the manual. \n" +
                      "Have you read the manual?");
        responses.add("Your description is a bit \n" +
                      "wishy-washy. Have you got an expert \n" +
                      "there with you who could describe \n" +
                      "this more precisely?");
        responses.add("That’s not a bug, it’s a feature!");
        responses.add("Could you elaborate on that?");
    }

    /**
     * Enter all the known keywords and their associated
     * responses into our response map.
     */
    private void fillResponseMap()
    {
        responseMap.put("slow",
            "I think this has to do with your hardware. \n" +
            "Upgrading your processor should solve all " +
            "performance problems. \n" +
            "Have you got a problem with our software?");
        responseMap.put("bug",
            "Well, you know, all software has some bugs. \n" +
            "But our software engineers are working very " +
            "hard to fix them. \n" +
            "Can you describe the problem a bit further?");
        responseMap.put("expensive",
            "The cost of our product is quite competitive. \n" +
            "Have you looked around and " +
            "really compared our features?");
    }

    private String pickDefaultResponse()
    {
        int index = randomGenerator.nextInt(responses.size());
        return responses.get(index);
    }
}