PersistentLogin.java (path: ../login/impl)

/**
  * Implements the Login interface. Defines a file-based set of accounts.
  */

package login.impl;
import login.*;
import java.io.*;

public class PersistentLogin implements Login
    {

    public File file;

    /**
      * Initializes the file to a given value.
      * @param f The given file.
      */

    public PersistentLogin(File f)
        {
        file = f;
        }

    /**
      * Checks the presence of a given account in the file. Returns it if present. No exceptions thrown; returns null where an IOException would be present.
      * @param login The username associated to the account.
      * @param password The password associated to the account.
      * @return The account associated to the given access credentials, if present.
      */

    public Account login(String login, String password)
        {
        try
            {
            FileReader f = new FileReader(file);
            BufferedReader br = new BufferedReader(f);
            String line = br.readLine();
            while(line != null)
                {
                if(!(line.equals("")))
                    {
                    String[] data = line.split(";");
                    if(data[0].equals(login) && data[1].equals(password))
                        return new Account(data[0], data[1], data[2]);
                    }
                line = br.readLine();
                }
            }
        catch(IOException e)
            {
            return null;
            }
        return null;
        }

    }