import java.io.*;
//import java.util.*;   
import java.util.Enumeration;   

import COM.odi.*;
import COM.odi.util.*;
import COM.odi.util.query.Query;

public class readData {

  public static void main(String argv[]){
    String dbName = argv[0];

    try {
      // initialize the objectStore database
      ObjectStore.initialize(null,null);
      Database db= Database.open(dbName,ObjectStore.OPEN_READONLY);
      readDatabase(db);
    } catch (Throwable throwable) {
        java.io.ByteArrayOutputStream stream
          = new java.io.ByteArrayOutputStream();
        java.io.PrintWriter writer = new java.io.PrintWriter(stream);
        throwable.printStackTrace(writer);
        writer.flush();
        System.err.println("An unhandled throw occurred " +
                           "while executing the Movie Read program:\n" +
                            stream);
        System.exit(1);
      }

     ObjectStore.shutdown(true);
   }

  static void readDatabase(Database db) {
    // start the transaction
    Transaction tr =Transaction.begin(ObjectStore.READONLY);

    // get database roots
    OSTreeSet allMovies = (OSTreeSet) db.getRoot("allMovies");
    OSTreeSet allStars = (OSTreeSet) db.getRoot("allStars");

    System.out.println("------------------------------------");

    // create an iterator to go through all the objects
    System.out.println("The title of movies are:");
    Iterator movieIterator = allMovies.iterator();
    int i=1;
    while(movieIterator.hasNext()) {
      Movie m = (Movie) movieIterator.next();
      System.out.println("  " + i++ + "." + " " + m.getTitle());
    }

    System.out.println("------------------------------------");

    //create iterator to go through all Star objects
    Iterator starIterator = allStars.iterator();
    System.out.println("The stars are:");
    i=1;
    while(starIterator.hasNext()){
      Star s = (Star) starIterator.next();
      System.out.println("  " + i++ + "." + " " + s.getStarName());
    }

    System.out.println("------------------------------------");
    System.out.println();

    // This a query. Get the movies in which "tina" has acted
    Query q = new Query(Star.class, "getStarName() == \"tina\"");
    Collection stars = (Collection) db.getRoot("allStars");
    Set result = q.select(stars);
    Iterator qryIterator = result.iterator();
    while(qryIterator.hasNext()){
      Star s1 = (Star) qryIterator.next();
      System.out.println("The number of movies acted by tina are:"+
         s1.getNumMovies());
      System.out.println("They are:");
      Enumeration m = s1.getMovies().elements();
      while (m.hasMoreElements()) {
        Movie x = (Movie) m.nextElement();
        System.out.println(x.getTitle());
      }
    }

    System.out.println("-----------------------------------");
    System.out.println();

    // Query to get names of all stars who have acted in movie bugs life
    Query q1 = new Query(Movie.class,"getTitle() == \"bugs life\"");
    Collection mvs = (Collection) db.getRoot("allMovies");
    Set result1 = q1.select(mvs);
    Iterator q1Iterator = result1.iterator();
    while(q1Iterator.hasNext()){
      Movie mv = (Movie) q1Iterator.next();
      System.out.println("The number of stars in bugs life are "+
         mv.getNumStars());
      System.out.println("They are:");
      Enumeration strs = mv.getStars().elements();
      while (strs.hasMoreElements()) {
        Star s = (Star) strs.nextElement();
        System.out.println(s.getStarName() + "  " + s.getStarAddress());
      }
    }
    System.out.println("------------------------------------");
    System.out.println();

    // commit the transation
    tr.current().commit();

    // close the database
    db.close();
  }  
}