UserData.java

package dashboard;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import java.io.FileWriter;
import java.io.IOException;

class UserData {
    private String ID;
    private String Email;
    private String Password;
    private String Name;
    private String Status;

    private static final String DELIMITER = ",";
    private static final int USER_LIMIT = 10;

    private UserData[] users;

    public void create(String dest){
        
        // Data for the CSV file:
        String[] headers = {"ID", "UserEmail", "Password", "Name", "Designation"};
        String[][] data = {
                {"000", "admin@sql", "0000", "Admin", "admin"},
                {"001", "eng1@sql", "pass1", "Mr.Eng", "engineer"},
                {"002", "eng2@sql", "pass2", "Ms.Eng", "engineer"}
        };

        createCsvFile(dest, headers, data);

        System.out.println("users.csv file created successfully.");
    }

    private static void createCsvFile(String fileName, String[] headers, String[][] data) {
        try (FileWriter writer = new FileWriter(fileName)) {
            // Write headers to the CSV file
            for (String header : headers) {
                writer.append(header).append(",");
            }
            writer.append("\n");

            // Write data to the CSV file
            for (String[] row : data) {
                for (String value : row) {
                    writer.append(value).append(",");
                }
                writer.append("\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public void load(String source) {
        File sourceFile = new File(source);

        try {
            Scanner sc = new Scanner(sourceFile);
            sc.useDelimiter(DELIMITER);

            // Skip the header line
            if (sc.hasNextLine()) {
                sc.nextLine();
            }

            //Storing in an array list:

            ArrayList<UserData> userList = new ArrayList<>();

            while (sc.hasNextLine() && userList.size() < USER_LIMIT) {
                String line = sc.nextLine();

                // Split the line into individual fields using ","
                String[] fields = line.split(DELIMITER);

                // Check if the line has the expected number of fields
                if (fields.length == 5) {
                    String id = fields[0].trim();
                    String email = fields[1].trim();
                    String password = fields[2].trim();
                    String name = fields[3].trim();
                    String status = fields[4].trim();

                    userList.add(new UserData(id, email, password, name, status));
                } else {
                    System.out.println("Error: Missing tokens in the input file. Skipping the current line.");
                }
            }

            users = userList.toArray(new UserData[0]);

            System.out.println("\nNo. of users: " + userList.size());

            sc.close();
        } catch (FileNotFoundException e) {
            System.out.println("Error: File not found.");
            System.out.println("Creating file...");
            create(source);
            load(source);
            
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
            e.printStackTrace();
        }
    }

    //Constructors:

    public UserData(String ID, String Email, String Password, String Name, String Status) {
        this.ID = ID;
        this.Email = Email;
        this.Password = Password;
        this.Name = Name;
        this.Status = Status;
    }

    public UserData[] getUsers() {
        return users;
    }

    public String getEmail() {
        return Email;
    }

    public String getPassword() {
        return Password;
    }

    public String getName() {
        return Name;
    }

    public String getID() {
        return ID;
    }

    public String getStatus() {
        return Status;
    }
    
}