// AnimalSounds.java
// by Scot Drysdale on 11/25/04
// modified to use Scanner and generics by Scot Drysdale on 5/21/08

// Demonstrates the use of a Map to associate animals with the sounds
// that they make.

import java.util.*;

public class AnimalSounds {
  public static void main(String args[]) {
    // A map to play with, initially empty.
    Map<String,String> animalMap = new HashMap<String,String>();
    char command = ' ';   // a command
    String animal;        // an animal's name
    String sound;         // sound that the animal makes
    Scanner input = new Scanner(System.in);

    while (command != 'q') {
      System.out.print("Command (q, p, g, r, P, ?): ");
      command = input.nextLine().charAt(0);

      switch (command) {
      case 'q':   // quit
        System.out.println("Bye!");
        break;

      case 'p':   // put
        System.out.print("Enter an animal: ");
        animal = input.nextLine();
        if (animal.length() > 0) {
          System.out.print("Enter the sound that " + getArticle(animal)
              + " " + animal + " makes: ");
          sound = input.nextLine();
          while (sound.length() <= 0) {
            System.out.print("Enter the sound that " + getArticle(animal)
                + " " + animal + " makes: ");
            sound = input.nextLine();         
          }
          animalMap.put(animal, sound);
        }
        break;

      case 'g':   // get
        System.out.print("Enter an animal: ");
        animal = input.nextLine();
        if (animal.length() > 0) {
          Object obj = animalMap.get(animal);
          if (obj == null)
            System.out.println("I do not know the sound that " + getArticle(animal)
                + " " + animal + " makes.");
          else
            System.out.println(toTitleCase(getArticle(animal)) + " "
                + animal + " says " + obj + ".");
        }
        break;

      case 'r':   // remove
        System.out.print("Enter which animal to remove: ");
        animal = input.nextLine();
        if (animal.length() > 0)
          animalMap.remove(animal);
        break;

      case 'P':   // print
        if (animalMap.isEmpty())
          System.out.println("The map is empty");
        else {
          System.out.println("Here are the animals and their sounds:");

          Set<String> animalNames = animalMap.keySet();
          Iterator<String> iter = animalNames.iterator();

          while (iter.hasNext()) {
            animal = iter.next();
            System.out.println(toTitleCase(getArticle(animal)) + " "
                + animal + " says " + animalMap.get(animal) + ".");
          }
        }
        break;

      case '?':   // print all the commands
        System.out.println("Commands are\n  q: quit\n  p: put\n  g: get\n  " +
        "r: remove\n  P: print\n  ?: print all commands\n");
        break;

      default:
        System.out.println("Huh?");
      }
    }
  }
  
  // Return "an" if the first character of s is a vowel, "a" otherwise.
  private static String getArticle(String s) {
    char c = Character.toLowerCase(s.charAt(0));
    if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
      return "an";
    else
      return "a";
  }
  
  // Return the title-case version of s.
  private static String toTitleCase(String s) {
    return Character.toTitleCase(s.charAt(0)) +
        (s.length() <= 0 ? "" : s.substring(1));
  }
}