/* MovieModel - implements the movie model. Handles changes. * Copyright 2001, Bruce E. Wampler */ import java.io.*;import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class MovieModel    extends	WmvcModel{    private int currentMovieIndex;    private Vector theList;    private final int FILE_ID = 48879;	// 0xBEEF    // need two changed flags - one if a new entry has been    // added that is true only until the views update, and a    // global one that remains true if anything has changed    // until the list is saved    private boolean listChanged;   // true until views updated    private boolean editsMade;		// true until saved    private File myFile;    public ListIterator getMovieListIterator()       { return theList.listIterator();}    public boolean getListChanged() { return listChanged; }    public boolean getEditsMade() { return editsMade; }    public int getCurrentMovieIndex()       { return currentMovieIndex; }    public int getNumberOfMovies() { return theList.size(); }    public File getFile() { return myFile; }        public MovieModel()    {	editsMade = false;	listChanged = false;	theList = new Vector();	myFile = null;    }    public void setCurrentMovieIndex(int movieNumber)    {	if (theList == null || theList.size() == 0) // valid?	    return;	// Validate number passed in, wrap appropriately	if (movieNumber < 0)	    movieNumber = theList.size() - 1;	if (movieNumber >= theList.size())	    movieNumber = 0;	currentMovieIndex = movieNumber;  // change the movie	notifyViews();			  // update    }        public void addMovie(Movie movie)    {	if (movie == null)		// some validation	    return;	editsMade = true;  	   // we've made some changes	listChanged = true;	ListIterator it = getMovieListIterator();	int nextI = 0;	while (it.hasNext())	{	    // Assume list is sorted, so as soon as we find the	    // first entry that is > than this one, we insert	    // it before that one.	    nextI = it.nextIndex();	// index of next entry	    Movie m = (Movie) it.next();	    String adding = movie.getTitle();	    String curName = m.getTitle();	    if (adding.compareToIgnoreCase(curName) <= 0)	        break;			// curName > adding	}	if (!it.hasNext())	// add at end (also if 1st time)	{	    theList.add(movie);	    // make it current movie	    setCurrentMovieIndex(theList.size() - 1);	}	else			// add it before nextI	{	    theList.add(nextI,movie);	    setCurrentMovieIndex(nextI);	}    }        public void deleteCurrentMovie()    {	if (theList.size() <= 0)	    return;	editsMade = true;	// we've made some changes	listChanged = true;	theList.removeElementAt(currentMovieIndex);	setCurrentMovieIndex(currentMovieIndex);    }        public void replaceCurrentMovie(Movie movie)    {	if (movie == null)	    return;	theList.setElementAt(movie,currentMovieIndex);	editsMade = true;	// we've made some changes	listChanged = true;	notifyViews();    }        public boolean saveMovies()    {	return saveMoviesAs(myFile);    }        public boolean saveMoviesAs(File file)    {	if (file != null)	{	    try	    {	    	DataOutputStream out = new DataOutputStream(	    	        new BufferedOutputStream(	    	          new FileOutputStream(file)));	    	out.writeInt(FILE_ID);		ListIterator it = getMovieListIterator();		while (it.hasNext())		{		    Movie m = (Movie) it.next();		    m.writeMovie(out);		}		out.flush(); out.close();		myFile = file;		// remember name	    }	    catch (IOException e)	    {		JOptionPane.showMessageDialog(		    WmvcApp.getFrame(),		    "Error opening file: " + e,			 "MovieCat Error",		    JOptionPane.ERROR_MESSAGE);		return false;	    }	}	else	    return false;		editsMade = false;		// no edits now!	return true;    }    public boolean openMovies(File file)    {	if (file != null)	{	    myFile = file;		// remember the name	    try	    {	    	DataInputStream in = new DataInputStream(	    	        new BufferedInputStream(	    	          new FileInputStream(file)));		// check if file was made by us		if (in.readInt() != FILE_ID)		{		    in.close();		    myFile = null;		    JOptionPane.showMessageDialog(		        WmvcApp.getFrame(),			file.getName() +			 " is not a valid MovieCat file.",			 "MovieCat Error",			JOptionPane.ERROR_MESSAGE);		    return false;		}		for ( ; ; )	// do until catch EOF Exception		{		    Movie m = new Movie();		    if (!m.readMovie(in))		    	break;		    theList.add(m);		}	    }	    catch (IOException e)	    {		JOptionPane.showMessageDialog(		    WmvcApp.getFrame(),		    "Error reading file: " + e,			 "MovieCat Error",		    JOptionPane.ERROR_MESSAGE);		myFile = null;		return false;	    }	    editsMade = false;		// no edits to start	    listChanged = true;	    notifyViews();	    return true;	}	else	    return false;    }        public boolean closeMovies()    {	// Just close - Views responsible to save before closing	myFile = null;			// reset to empty values	theList.clear();	editsMade = false;		// no edits now!	listChanged = true;	notifyViews();	return true;    }        public Movie getCurrentMovie()    {	if (currentMovieIndex < 0 	             && currentMovieIndex >= theList.size())	    return null;	else if (theList.size() == 0)	    return null;	else	    return (Movie)theList.elementAt(currentMovieIndex);    }        public void notifyViews()    {	super.notifyViews();	// updating views makes list correct	listChanged = false;    }}