moviestore.java

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import java.util.*;
public class MovieStore {
    //实例属性
    private Hashtable     movieList, actorList, typeList;
    //get方法
    public Hashtable getMovieList() { return movieList; }
    public Hashtable getActorList() { return actorList; }
    public Hashtable getTypeList() { return typeList; }
    //构造方法
    public MovieStore() {
        movieList = new Hashtable();
        actorList = new Hashtable();
        typeList  = new Hashtable();
    }
    //toString方法
    public String toString() {
        return ("MovieStore with " + movieList.size() + " movies.");
    }
    public void addMovie(Movie aMovie) {
         movieList.put(aMovie.getTitle(), aMovie);
     if (!typeList.containsKey(aMovie.getType()))
        typeList.put(aMovie.getType(), new Vector());
     ((Vector)typeList.get(aMovie.getType())).add(aMovie);
     for (int i=0; i<aMovie.getActors().size(); i++) {
        String anActor = (String)aMovie.getActors().get(i);
        if (!actorList.containsKey(anActor))
            actorList.put(anActor, new Vector());
        ((Vector)actorList.get(anActor)).add(aMovie);
     }
    }
    private void removeMovie(Movie aMovie) {
    movieList.remove(aMovie.getTitle());
    ((Vector)typeList.get(aMovie.getType())).remove(aMovie);
    if (((Vector)typeList.get(aMovie.getType())).isEmpty())
        typeList.remove(aMovie.getType());
    for(int i=0; i<aMovie.getActors().size(); i++) {
        String anActor = (String)aMovie.getActors().get(i);
        ((Vector)actorList.get(anActor)).remove(aMovie);
        if (((Vector)actorList.get(anActor)).isEmpty())
            actorList.remove(anActor);
    }
  }
  public void removeMovie(String aTitle) {
      if (movieList.get(aTitle) == null)
           System.out.println("No movie with that title");
       else
           removeMovie((Movie)movieList.get(aTitle));
    }
    public void listMovies() {
      Enumeration  titles = movieList.keys();
      while(titles.hasMoreElements())
         System.out.println(titles.nextElement());
    }
    public void listMoviesWithActor(String anActor) {
      Enumeration someMovies = ((Vector)actorList.get(anActor)).elements();
      while(someMovies.hasMoreElements())
         System.out.println(someMovies.nextElement());
   }
   public void listMoviesOfType(String aType) {
        Enumeration  someMovies = ((Vector)typeList.get(aType)).elements();
        while(someMovies.hasMoreElements())
           System.out.println(someMovies.nextElement());
      }




}