[JAVA] - leggere da file di testo formattato [VERY LONG]

[tigerjack89]

import java.io.FileReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Scanner;
import javax.swing.JFileChooser;
import java.util.HashSet;
import java.util.Iterator;

/**
 * A class to read file from an input source and generate a data set
 * @author Simone
 *
 */
public class IndexReader
{
	public static HashSet<AudioFile> audioFiles = new HashSet<AudioFile>();
	public static HashSet<VideoFile> videoFiles = new HashSet<VideoFile>();
	public static HashSet<ImageFile> imageFiles = new HashSet<ImageFile>();
	public static HashSet<TextFile> textFiles = new HashSet<TextFile>();
	
	public static void main(String[] args) throws FileNotFoundException, 
		IOException
	{
		//Creo un nuovo oggetto per scegliere il percorso del file
		JFileChooser chooser = new JFileChooser();
		FileReader in = null;
		if (chooser.showOpenDialog(null) == chooser.APPROVE_OPTION)
		{
			File selectedFile = chooser.getSelectedFile();
			in = new FileReader(selectedFile);
			Scanner input = new Scanner(in);
			
			PrintStream p = System.out;
			
			for (AudioFile a : audioFiles)
				p.println(a);
			for (VideoFile a : videoFiles)
				p.println(a);
			for (ImageFile a : imageFiles)
				p.println(a);
			for (TextFile a : textFiles)
				p.println(a);
			
			
			input.close();
			in.close();
		}
	}
	
	/*
	 * Il metodo per leggere da dal file di input. In questo caso sarà proprio
	 * il nostro file index.dat
	 */
	public static void read(Scanner s)
	{
		if (!s.hasNext()) return;
		String type = s.next();
		if (!s.hasNext()) return;
		String path = s.next();
		if (!s.hasNextInt()) return;
		int size = s.nextInt();
		if (!s.hasNext()) return;
		String creationData = s.next();
		if (!s.hasNext()) return;
		String lastModifiedData = s.next();
		if (!s.hasNext()) return;
		String description = s.next();
		if (!s.hasNext()) return;
		String format = s.next();

		if (type.equalsIgnoreCase("audio"))
		{
			if (!s.hasNextInt()) return;
			int length = s.nextInt();
			audioFiles.add(new AudioFile(type, path, size, creationData, lastModifiedData,
					description, format, length));
		}
		else if (type.equalsIgnoreCase("video"))
		{
			if (!s.hasNextInt()) return;
			int length = s.nextInt();
			videoFiles.add(new VideoFile(type, path, size, creationData, lastModifiedData,
					description, format, length));
		}
		else if (type.equalsIgnoreCase("immagine"))
		{
			if (!s.hasNextInt()) return;
			int width = s.nextInt();
			if (!s.hasNextInt()) return;
			int height = s.nextInt();
			imageFiles.add(new ImageFile(type, path, size, creationData, lastModifiedData,
					description, format, width, height));
		}

		else textFiles.add(new TextFile(type, path, size, creationData, lastModifiedData,
				description, format));
	}
}