moviemodel.java

一个简单的浏览器

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;
	
	private boolean listChanged;
	private boolean editsMade;
	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 index){
		if(theList==null||theList.size()==0)
			return;
		if(index<0)
			index=theList.size()-1;
		if(index>=theList.size())
			index=0;
		currentMovieIndex=index;
		notifyViews();			
	}
	
	public void addMovie(Movie movie){
		if(movie==null)
			return;
		editsMade=true;
		listChanged=true;
		
		ListIterator it=getMovieListIterator();
		int nextI=0;
		while(it.hasNext()){
			nextI=it.nextIndex();
			Movie m=(Movie)it.next();
			String adding=movie.getTitle();
			String curName=m.getTitle();
			if(adding.compareToIgnoreCase(curName)<=0)
				break;
		}
		if(!it.hasNext()){
			theList.add(movie);
			setCurrentMovieIndex(theList.size()-1);
		}else{
			theList.add(nextI,movie);
			setCurrentMovieIndex(nextI);
		}	
	}
	
	public void deleteCurrentMovie(){
		if(theList.size()<=0){
			return;
		}
		editsMade=true;
		listChanged=true;
		theList.removeElementAt(currentMovieIndex);
		setCurrentMovieIndex(currentMovieIndex-1);
	}
	
	public void replaceCurrentMovie(Movie movie){
		if(movie==null)
			return;
		theList.setElementAt(movie,currentMovieIndex);
		editsMade=true;
		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;	
			}catch(IOException e){
				JOptionPane.showMessageDialog(
					WmvcApp.getFrame(),
					"Error opening file:"+e,
					"MovieCat Error",
					JOptionPane.ERROR_MESSAGE);
				return false;	
			}
		}else{
			return false;
		}
		editsMade=false;
		return true;
	}
	
	public boolean openMovies(File file){
		if(file!=null){
			myFile=file;
			try{
				DataInputStream in=new DataInputStream(
					new BufferedInputStream(
						new FileInputStream(file)));
				if(in.readInt()!=FILE_ID){
					in.close();
					myFile=null;
					JOptionPane.showMessageDialog(
						WmvcApp.getFrame(),
						file.getName()+
						"is not a valid MovieCat file.",
						"Movie Error",
						JOptionPane.ERROR_MESSAGE);
					return false;	
				}
				while(true){
					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;
			listChanged=true;
			notifyViews();
			return true;
		}else{
			return false;
		}
	}
	
	public boolean closeMovies(){
		myFile=null;
		theList.clear();
		editsMade=false;
		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();
		listChanged=false;
	}
}