Opération sur fichiers

Main.java

/**
 * Ce programme fait diverses opérations sur un fichier texte.
 * @author Adrien Tétar
 * @version 1.0
 *
 * Copyright © 2012, Adrien Tétar. All rights reserved.
 */
import java.awt.Component;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.IOException;
import java.util.Arrays;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileNameExtensionFilter;

class Main {
	private static final Boolean DEBUG = false;
	/*
	 * Triggers b/w simple input function and more
	 * complicated, bulletproof function.
	 */
	private static final Boolean BULLETPROOF = true;
	
	private static String[] nom = new String[10];
	private static String[] tel = new String[10];

	/* Java file chooser, for file abs. path input. */
	public static String dialogFichier(Component parent)
	{
		JFileChooser box = new JFileChooser();

		if (box.showOpenDialog(parent) == JFileChooser.APPROVE_OPTION)
		{
			return box.getSelectedFile().getAbsolutePath();
		}
		/* NOTE: 'null' case (Cancel button) is handled directly in the program. */
		
		return null;
	}
	
	/* Java file chooser, for .txt file abs. path input. */
	public static String dialogFichierTxt(Component parent)
	{
		JFileChooser box = new JFileChooser();
		box.setFileFilter(new FileNameExtensionFilter("Fichiers texte", "txt"));
		
		if (box.showOpenDialog(parent) == JFileChooser.APPROVE_OPTION)
		{
			/* Append '.txt' extension if the user didn't do it. */
			if(!box.getSelectedFile().getAbsolutePath().toLowerCase().endsWith(".txt"))
			{
				return box.getSelectedFile().getAbsolutePath() + ".txt";
			}
			else
			{
				return box.getSelectedFile().getAbsolutePath();
			}
		}
		/* NOTE: 'null' case (Cancel button) is handled directly in the program. */
		
		return null;
	}

	/* Java file chooser, for .txt file saving. */
	public static String nouveauFichierTxt(Component parent)
	{
		JFileChooser box = new JFileChooser();
		box.setFileFilter(new FileNameExtensionFilter("Fichiers texte", "txt"));
		
		if (box.showSaveDialog(parent) == JFileChooser.APPROVE_OPTION)
		{
			/* Append '.txt' extension if the user didn't do it. */
			if(!box.getSelectedFile().getAbsolutePath().toLowerCase().endsWith(".txt"))
			{
				return box.getSelectedFile().getAbsolutePath() + ".txt";
			}
			else
			{
				return box.getSelectedFile().getAbsolutePath();
			}
		}
		/* NOTE: 'null' case (Cancel button) is handled directly in the program. */
		
		return null;
	}
	
	public static BufferedReader lireFichier(String path) throws FileNotFoundException
	{
		BufferedReader Fichier = null;
		if (BULLETPROOF == false)
		{
			return Fichier = new BufferedReader(new FileReader(path));
		}
		else
		{
			path = null;
			/* Avoid crash on blank input. */
			if ((path = dialogFichierTxt(null)) != null)
			{
				Fichier = new BufferedReader(new FileReader(path));
			}
			/* 'null' value means user clicked on Cancel. Quit. */
			else
			{
				System.exit(0);
			}
		}
		
		return Fichier;
	}
	
	/* Same function as before but totally free of hardcoded path. */
	public static BufferedReader lireFichierGen() throws FileNotFoundException
	{
		BufferedReader Fichier = null;
		/* BULLETPROOF. */
		String path;
		/* Avoid crash on blank input. */
		if ((path = dialogFichierTxt(null)) != null)
		{
			Fichier = new BufferedReader(new FileReader(path));
		}
		/* 'null' value means user clicked on Cancel. Quit. */
		else
		{
			System.exit(0);
		}
		
		return Fichier;
	}
	
	/* ==================================== */
	
	/*
	 * Function n°1.
	 * Inputs a file and displays its content.
	 */
	public static void affFichier() throws IOException
	{
		BufferedReader Fichier = lireFichier("D:\\Documents and Settings\\" +
				"ISN\\Mes documents\\Téléchargements\\repertoire.txt");
		
		String ligne;
		while ((ligne = Fichier.readLine()) != null)
		{
			System.out.println(ligne);
		}
	    Fichier.close();
	}
	
	/*
	 * Function n°1.
	 * Reads a txt file which must have following properties:
	 * - 10 lines long
	 * - syntax: <Name>\n<Phone number>\n<...>
	 */
	public static void ouvertureFichier() throws IOException
	{
		BufferedReader Fichier = lireFichier("D:\\Documents and Settings\\" +
				"ISN\\Mes documents\\Téléchargements\\repertoire.txt");
		
		for (int i=0; i<10; i++)
		{
			nom[i] = Fichier.readLine();
			tel[i] = Fichier.readLine();
		}
	    Fichier.close();
	}
	
	/*
	 * Function n°1.
	 * Reads a txt file which must have following properties:
	 * - X lines long
	 * - syntax: <Name>\n<Phone number>\n<...>
	 */
	public static void ouvertureFichierGen() throws IOException
	{
		BufferedReader Fichier = lireFichierGen();
		
		String ligne;
		int cpt = 0;
		while ((ligne = Fichier.readLine()) != null)
		{
			/*
			 * One line out of two will contain names,
			 * the second ones will contain phone numbers.
			 */
			if (cpt % 2 == 0)
			{
				nom[cpt/2] = ligne;
			}
			else
			{
				tel[cpt/2] = ligne;
			}
			cpt++;
		}
		Fichier.close();
	}
	
	public static void affVariables()
	{
		System.out.println("nom: " + Arrays.toString(nom));
		System.out.println("tel: " + Arrays.toString(tel));
	}

	/* ==================================== */
	
	/*
	 * Function n°2.
	 * Input a name from the user, give back the corresponding
	 * phone number.
	 */
	public static void rechercheNum() throws IOException
	{
		/*
		 * If 'nom' and 'tel' haven't been filled yet,
		 * call the input function.
		 */
		if (nom[0] == null || tel[0] == null)
		{
			ouvertureFichierGen();
		}
		
		/* If nothing matches, say it to the user. */
		Boolean found = false;
		String tmp = JOptionPane.showInputDialog("Quel est le nom de la personne désirée ?");
		/* 'null' value means user clicked on Cancel. Quit. */
		if (tmp == null)
		{
			System.exit(0);
		}
		for (int i=0; i<nom.length; i++)
		{
			if (nom[i].equals(tmp))
			{
				JOptionPane.showMessageDialog(null, "Le numéro de téléphone de " + tmp + " est " + tel[i] + ".");
				found = true;
//				/*
//				 * Halt the loop to avoid further researches.
//				 * Note: this will prevent displaying every matches in case of name duplicates.
//				 */
//				i = nom.length - 1;
			}
		}
		if (found == false)
		{
			JOptionPane.showMessageDialog(null, "Aucune correspondance n'a été trouvée dans le répertoire.");
		}
	}
	
	/* ==================================== */
	
	/*
	 * Function n°3.
	 * Creates a txt file which will store a sentence given by the user,
	 * encrypted by ASCII+10 method.
	 * Then, another function will decrypt the message and display it.
	 */
	public static void cryptPhrase() throws IOException
	{
		String phrase = JOptionPane.showInputDialog("Quelle est la phrase à crypter ?");
		/* 'null' value means user clicked on Cancel. Quit. */
		if (phrase == null)
		{
			System.exit(0);
		}
		
		PrintWriter Fichier = null;
		if (BULLETPROOF == false)
		{
			Fichier = new PrintWriter(new BufferedWriter(
					new FileWriter("D:\\Documents and Settings\\" +
							"ISN\\Mes documents\\Téléchargements\\message.txt")));
		}
		else
		{
			String path;
			/* Avoid crash on blank input. */
			if ((path = nouveauFichierTxt(null)) != null)
			{
				Fichier = new PrintWriter(new BufferedWriter(new FileWriter(path)));
			}
			/* 'null' value means user clicked on Cancel. Quit. */
			else
			{
				System.exit(0);
			}
		}
		
	    StringBuffer crypt = new StringBuffer(phrase);
	    for(int i=0; i<phrase.length(); i++)
	    {
			crypt.setCharAt(i, (char)((phrase.charAt(i)+10) % 128));
	    }
	    JOptionPane.showMessageDialog(null, "La phrase a été cryptée avec succès.");
	    Fichier.println(crypt);
	    Fichier.close();
	}
	
	public static void decryptPhrase() throws IOException
	{
		BufferedReader Fichier = null;
		if (BULLETPROOF == false)
		{
			Fichier = lireFichier("D:\\Documents and Settings\\" +
					"ISN\\Mes documents\\Téléchargements\\message.txt");
		}
		else
		{
			Fichier = lireFichierGen();
		}
		
		String phrase;
		int cpt = 0;
		/* In case there's more than one line.. */
		while ((phrase = Fichier.readLine()) != null)
		{
			cpt++;
			StringBuffer decrypt = new StringBuffer(phrase);
			for(int i=0; i<phrase.length(); i++)
			{
				decrypt.setCharAt(i, (char)((phrase.charAt(i)-10) % 128));
			}
			JOptionPane.showMessageDialog(null, "La phrase [" + cpt + "] a été décryptée avec succès: " + decrypt);
		}
		Fichier.close();
	}
	
	/* ==================================== */
	
	public static void main(String[] args) throws IOException
	{
		/* TODO: add GUI. */
		/* Function n°1. */
		if (DEBUG)
		{
			System.out.println("Fonction n°1");
		}
//		affFichier();
//		ouvertureFichier();
		ouvertureFichierGen();
		
		affVariables();
		
		/* Function n°2. */
		if (DEBUG)
		{
			System.out.println("Fonction n°2");
		}
		rechercheNum();
		
		/* Function n°3. */
		if (DEBUG)
		{
			System.out.println("Fonction n°3");
		}
		cryptPhrase();
		decryptPhrase();
		
		if (DEBUG)
		{
			System.out.println("nom: " + Arrays.toString(nom));
			System.out.println("tel: " + Arrays.toString(tel));
		}
	}
}