View

package il.ac.hit;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.*;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;
import org.apache.log4j.BasicConfigurator;


import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Logger;
import org.apache.log4j.SimpleLayout;


public class View {

    private JPanel mainP;       // that panel will have all the currencies operations
    private JPanel dateP;       // that panel will have the details about the current date
    private JFrame frame;       // the frame

    private JTable currencyT;   // the currency table
                                // all the titles\labels :
    private JLabel l_title;
    private JLabel l_date;
    private JLabel l_convert;
    private JLabel l_from;
    private JLabel l_to;

    private JButton b_calc;                 // the calculate button

    private JTextField tf_amount;           // in this textField the user enter the amount to calculate
    private JTextField tf_result;           // in this textField the user will get the answer

    private JComboBox<?> cb_from;           // this comboBox will include all the currencies that the xml have
    private JComboBox<?> cb_to;             // this comboBox will include all the currencies that the xml have
    private DateFormat currentDateUpdated;  // the current date
    private Date date;                      // the current date
    private ActionListener al;              // will listen to any operation that the user do
    private String[] curreciesNames;        // will include all the currenciesNames that the xml have
    private double[] curreciesRate;         // will include all the currenciesRates that the xml have
    private Timer timer;                    // will care the data update every scheduled time
    public static Logger logger;           // will manage the log4j


    public View()
    {
        al = new ButtonListener();          // initialize the listener to be ButtonListener
        timer = new Timer();                // initialize the timer object
        logger = Logger.getLogger("View");  // set the Logger object to this ( class View )
        BasicConfigurator.configure();      // configure the Logger object
        try {                               // create new log text file
            logger.addAppender(new FileAppender(new SimpleLayout(), "logFile.txt"));
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        logger.info("\n\nEnterence time: " + new Date());   // write in the log file the enterence time
    }


    // in this function the 2 arrays of currencies data will be initialize
    public void initializeCurrenciesArrays() {       // maybe change it
        int numOfCurrencies = XMLreader.connectToUrl();
        curreciesNames = new String[numOfCurrencies];
        curreciesRate = new double[numOfCurrencies];

            currentDateUpdated = new SimpleDateFormat("yyyy-MM-dd");// define format for date
            date =  XMLreader.updateData(curreciesNames, curreciesRate);
    }


    // find specific element in the CurrencyNames array
    public int findCurrencyNameInArray(String toFind){

        int ans = -1;   // -1 means doesn't found
        for(int i = 0 ; i < curreciesNames.length ; i++){   // check any cell to find
            if ( curreciesNames[i].equals(toFind) )         // the "toFind" in currency
                ans = i;                                    // names array
        }
        return ans;
    }


    // this class role is to handle buttons press
    public class ButtonListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent arg0)
        {
            Object pressed = arg0.getSource();                  // to know what button was clicked
            Object cb_toSelected = cb_to.getSelectedItem();     // to know which element was
            Object cb_fromSelected = cb_from.getSelectedItem(); // chosen from the comboBoxes

            if ( pressed == b_calc ){   // if calculate button was pressed
                String temp = tf_amount.getText();  // get the amount
                if (temp.equals("") || temp.equals("insert amount"))    // if the amount textFiled is empty
                {
                    JOptionPane.showMessageDialog(null,"Please Enter Amount To Convert From");
                }
                else {  // if the amount textFiled isn't empty

                    int toIndex = findCurrencyNameInArray(cb_toSelected.toString());    // find that specific currency index
                    int fromIndex = findCurrencyNameInArray(cb_fromSelected.toString());// from the currencyName array
                    tf_result.setText( Double.toString  // Calculate currency
                            (Double.parseDouble(tf_amount.getText()) * curreciesRate[fromIndex] / curreciesRate[toIndex])  );
                }   // end of else
            }   // end if

        }   // end of actionPerformed
    }   // end of ButtonListener


    public void fillTabel(){

        // fill names
        for ( int i = 0 ; i < curreciesRate.length ; i++){
            currencyT.setValueAt(curreciesNames[i], i+1, 0);
            currencyT.setValueAt(curreciesNames[i], 0, i+1);
        }

        // fill rates
        for ( int i = 0 ; i < curreciesRate.length ; i++){
            for ( int j = 0 ; j < curreciesRate.length ; j++){
                currencyT.setValueAt(curreciesRate[i] / curreciesRate[j], i+1, j+1);
            }
        }
    }


    // the main method goal is to run the GUI
    public void start()
    {
        initializeCurrenciesArrays();
        mainP = new JPanel();
        dateP = new JPanel();
        l_title = new JLabel("Currency Table");
        l_title.setFont(new Font("Serif", Font.BOLD, 15));
        l_date = new JLabel(currentDateUpdated.format(date));
        l_date.setFont(new Font("Serif", Font.BOLD, 15));
        l_convert = new JLabel("Convert");
        l_from = new JLabel("From");
        l_to = new JLabel("To");

        b_calc = new JButton("Calculate");
        b_calc.addActionListener(al);
        cb_from = new JComboBox<String>(curreciesNames);
        cb_to = new JComboBox<String>(curreciesNames);
        cb_from.addActionListener(al);
        cb_to.addActionListener(al);
        tf_amount = new JTextField(10);

        tf_result = new JTextField(10);
        frame = new JFrame("Currency converter");

        tf_amount.addFocusListener(new FocusListener(){     // this lines purpose
            // is to set the words
            @Override                                       // insert currency in
            public void focusGained(FocusEvent arg0) {      // the amount text field
                tf_amount.setText("");                      // when there is no text
            }                                               // there at all.

            @Override
            public void focusLost(FocusEvent arg0) {
                if (tf_amount.getText().equals(""))
                    tf_amount.setText("insert amount");
            }

        }
        );


        currencyT = new JTable(curreciesNames.length+1, curreciesNames.length+1);
        currencyT.setEnabled(false);

        fillTabel();

        frame.setLayout(new BorderLayout());
        dateP.setLayout(new FlowLayout());

        frame.add(dateP, BorderLayout.NORTH);
        dateP.add(l_title);
        dateP.add(l_date);

        frame.add(currencyT, BorderLayout.SOUTH);

        mainP.setLayout(new GridLayout(6, 1));
        tf_amount.setFont(new Font("Serif", Font.BOLD, 15));
        mainP.add(l_convert);
        mainP.add(tf_amount);
        mainP.add(l_from);
        mainP.add(cb_from);
        mainP.add(l_to);
        mainP.add(cb_to);
        mainP.add(b_calc);

        mainP.add(tf_result);

        frame.pack();

        frame.add(mainP, BorderLayout.CENTER);
        frame.setResizable(false);
        frame.setVisible(true);     // set the frame to be visible
        frame.setSize(600, 400);    // set the frame default size

        frame.addWindowListener(new WindowAdapter()
        {
            @Override
            public void windowClosing(WindowEvent e) {
                logger.info("Exit time: " + new Date());
                System.exit(0);
            }
        }
        );


        timer.schedule(new TimerTask() {

            @Override
            public void run() {

                date = XMLreader.updateData(curreciesNames, curreciesRate);
                logger.info("UPDATE AT: " + date);   // write in the log file the update time
                fillTabel();
            }

        }, 0, 10000000);


    }

}