Ajax Framework

package org.primefaces.showcase.view.ajax;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

import jakarta.annotation.PostConstruct;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.context.FacesContext;
import jakarta.faces.view.ViewScoped;
import jakarta.inject.Named;

@Named
@ViewScoped
public class BasicView implements Serializable {

    private String text1;
    private String text2;
    private String text3;
    private String text4;
    private String text5;
    private int number;
    private Map<String, Map<String, String>> data = new HashMap<>();
    private String country;
    private String city;
    private Map<String, String> countries;
    private Map<String, String> cities;

    @PostConstruct
    public void init() {
        countries = new HashMap<>();
        countries.put("USA", "USA");
        countries.put("Germany", "Germany");
        countries.put("Brazil", "Brazil");

        Map<String, String> map = new HashMap<>();
        map.put("New York", "New York");
        map.put("San Francisco", "San Francisco");
        map.put("Denver", "Denver");
        data.put("USA", map);

        map = new HashMap<>();
        map.put("Berlin", "Berlin");
        map.put("Munich", "Munich");
        map.put("Frankfurt", "Frankfurt");
        data.put("Germany", map);

        map = new HashMap<>();
        map.put("Sao Paulo", "Sao Paulo");
        map.put("Rio de Janerio", "Rio de Janerio");
        map.put("Salvador", "Salvador");
        data.put("Brazil", map);
    }

    public void increment() {
        number++;
    }

    public void handleKeyEvent() {
        if (text5 != null) {
            text5 = text5.toUpperCase();
        }
    }

    public String getText1() {
        return text1;
    }

    public void setText1(String text1) {
        this.text1 = text1;
    }

    public String getText2() {
        return text2;
    }

    public void setText2(String text2) {
        this.text2 = text2;
    }

    public String getText3() {
        return text3;
    }

    public void setText3(String text3) {
        this.text3 = text3;
    }

    public String getText4() {
        return text4;
    }

    public void setText4(String text4) {
        this.text4 = text4;
    }

    public String getText5() {
        return text5;
    }

    public void setText5(String text5) {
        this.text5 = text5;
    }

    public int getNumber() {
        return number;
    }

    public Map<String, Map<String, String>> getData() {
        return data;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public Map<String, String> getCountries() {
        return countries;
    }

    public Map<String, String> getCities() {
        return cities;
    }

    public void onCountryChange() {
        if (country != null && !"".equals(country)) {
            cities = data.get(country);
        }
        else {
            cities = new HashMap<>();
        }
    }

    public void displayLocation() {
        FacesMessage msg;
        if (city != null && country != null) {
            msg = new FacesMessage("Selected", city + " of " + country);
        }
        else {
            msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Invalid", "City is not selected.");
        }

        FacesContext.getCurrentInstance().addMessage(null, msg);
    }
}