//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//PIMS: Personal Invstment Management System
//Class : Security Manager
//This class defines two methods:-
//	1. Validate User
//	2. Change Password
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import java.lang.*;
import java.io.*;
import java.util.*;
import java.text.*;

public class SecurityManager{

	//attributes.
	private dataRepository DR;
	private String login;//login name of the user in the database
	private String password;//password of the user in the database
	private boolean debug = false;//boolean variable used for debugging this class.

	public SecurityManager(dataRepository DR){
	   try{
		this.DR = DR;

		//Read the login and password of the authorized user.
		String log_pass = DR.GetAuthentication();
		tokenize(log_pass);

	   }catch(Exception e){}
	}

	   //private method: tokenizes <login>:<password>
	   private void tokenize(String log_pass){

		StringTokenizer ST = new StringTokenizer(log_pass, ":");
		login = ST.nextToken();
		password = ST.nextToken();
	   }

	   //Method to validate user credentials entrered
	   public boolean ValidateUser(String log, String pass ){

	   	if(login.equals(log) && password.equals(pass))return(true);
		else return(false);
	   }
	   
	   //Method to validate the password of the user
	   public boolean ValidateUser(String pass){

	   	if(password.equals(pass))return(true);
		else return(false);
	   }
	   
	   //Method to change the password of the user. Returns true if the 
	   //pasword is changed, otherwise if there is an error
	   public boolean ChangePassword(String new_pass)throws Exception{

	   	password = new_pass;
		return(DR.changePassword(new_pass));
	   }
}