package model;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Schueler implements Serializable{
    private String nr;
    private String nachname;
    private String vorname;
    private char geschlecht;

    private static final List<Schueler> klasse;

    static {
        klasse = new ArrayList<>();

        klasse.add(new Schueler(1, "Nachname1", "Vorname1", 'M'));
        klasse.add(new Schueler(2, "Nachname2", "Vorname2", 'W'));
        klasse.add(new Schueler(3, "Nachname3", "Vorname3", 'M'));
        klasse.add(new Schueler(4, "Nachname4", "Vorname4", 'M'));
        klasse.add(new Schueler(5, "Nachname5", "Vorname5", 'M'));
        klasse.add(new Schueler(6, "Nachname6", "Vorname6", 'M'));
    }

    public Schueler() {
        this(0, "Name", "Name", 'M');
    }

    private Schueler(int nr, String nachname, String vorname, char geschlecht) {
        this.nr = nr + "";
        this.nachname = nachname;
        this.vorname = vorname;
        this.geschlecht = geschlecht;
    }

    public static List<Schueler> getKlasse() {
        return klasse;
    }

    public String getNachname() {
        return nachname;
    }

    public String getNr() {
        return nr;
    }

    public int getNrInt(){
        return Integer.parseInt(nr);
    }
    public String getVorname() {
        return vorname;
    }

    public char getGeschlecht() {
        return geschlecht;
    }

    public void setNr(String nr) {
        this.nr = nr;
    }

    public void setGeschlecht(char geschlecht) {
        this.geschlecht = geschlecht;
    }

    public void setNachname(String nachname) {
        this.nachname = nachname;
    }

    public void setVorname(String vorname) {
        this.vorname = vorname;
    }

    @Override
    public String toString() {
        return vorname + " " + nachname;
    }


}

package controller;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.inject.Named;
import javax.enterprise.context.SessionScoped;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;
import model.Schueler;

@Named(value = "schuelerCon")
@ManagedBean
@SessionScoped
public class SchuelerController implements Serializable {

    List<Schueler> klasse = new ArrayList<>();
    List<Schueler> filteredKlasse;
    List<Schueler> selectedKlasse = new ArrayList<>();
    String username;
    String password;
    boolean loggedIn = false;
    Schueler newSchueler = new Schueler();
    boolean weiblich;

    public List<Schueler> getFilteredKlasse() {
        return filteredKlasse;
    }

    public void setFilteredKlasse(List<Schueler> filteredKlasse) {
        this.filteredKlasse = filteredKlasse;
    }

    public SchuelerController() {
    }

    public List<Schueler> getKlasse() {
        return klasse;
    }

    public void setKlasse(List<Schueler> klasse) {
        this.klasse = klasse;
    }

    public List<Schueler> getSelectedKlasse() {
        return selectedKlasse;
    }

    public void setSelectedKlasse(List<Schueler> selectedKlasse) {
        this.selectedKlasse = selectedKlasse;
    }

    public void loadKlasse() {
        klasse = Schueler.getKlasse();
        filteredKlasse = klasse;
    }

    public void login() {
        FacesMessage message = null;

        if (username != null && username.equals("admin") && password != null && password.equals("pwd01")) {
            loggedIn = true;
            loadKlasse();
            message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Welcome", username);
        } else {
            loggedIn = false;
            message = new FacesMessage(FacesMessage.SEVERITY_WARN, "Loggin Error", "Invalid credentials");
        }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public boolean isLoggedIn() {
        return loggedIn;
    }

    public void setLoggedIn(boolean loggedIn) {
        this.loggedIn = loggedIn;
    }

    public void addSchueler() {
        if (weiblich) {
            newSchueler.setGeschlecht('W');
        } else {
            newSchueler.setGeschlecht('M');
        }
        String nr = "" + (klasse.stream().max((x1, x2) -> x1.getNrInt() - x2.getNrInt()).get().getNrInt() + 1);
        newSchueler.setNr(nr);
        klasse.add(newSchueler);
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Saved", "Benutzer added!: " + newSchueler);
        FacesContext.getCurrentInstance().addMessage(null, message);
        newSchueler = new Schueler();
    }

    public void deleteSchueler() {
        if (!loggedIn) {
            System.out.println("Not logged in");
            return;
        }
        if (!klasse.isEmpty()) {
            System.out.println("remove Klasse");
            klasse.removeAll(selectedKlasse);
        }
    }

    public Schueler getNewSchueler() {
        return newSchueler;
    }

    public void setNewSchueler(Schueler newSchueler) {
        this.newSchueler = newSchueler;
    }

    public boolean isWeiblich() {
        return weiblich;
    }

    public void setWeiblich(boolean weiblich) {
        this.weiblich = weiblich;
    }

}

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui">

    <h:head>
        <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
        <title>PrimeFaces Dialog</title>
        <style>
            body{
                background-color: appworkspace;
            }
        </style>
        <script type="text/javascript">
            function handleLoginRequest(xhr, status, args) {
                if (args.validationFailed || !args.loggedIn) {
                    PF('dlg').jq.effect("shake", {times: 5}, 100);
                } else {
                    PF('dlg').hide();
                }
            }
        </script>
    </h:head>

    <h:body>
        <h:form id="loginForm">
            <h:panelGrid columns="1">
                <p:outputLabel value="LoggedIn: #{schuelerCon.loggedIn}" style="color: whitesmoke"/>
                <p:commandButton type="button" value="Login" onclick="PF('dlg').show();" title="login"/>
            </h:panelGrid>

            <p:growl id="growl" sticky="true" showDetail="true" life="3000" />

            <p:dialog header="Login" widgetVar="dlg" resizable="false">
                <h:panelGrid columns="2" cellpadding="5">
                    <h:outputLabel for="username" value="Username:" />
                    <p:inputText id="username" value="#{schuelerCon.username}" required="true" label="username" />

                    <h:outputLabel for="password" value="Password:" />
                    <p:password id="password" value="#{schuelerCon.password}" required="true" label="password" />

                    <f:facet name="footer">
                        <p:commandButton value="Login" update="growl loginForm :dataForm" actionListener="#{schuelerCon.login()}"
                                         oncomplete="handleLoginRequest(xhr, status, args)"/>
                    </f:facet>
                </h:panelGrid>
            </p:dialog>
        </h:form>

        <h:form id="dataForm" style="position: absolute; top: 5px; left: 350px;">
            <p:dataTable value="#{schuelerCon.klasse}"
                         var="schueler"

                         filteredValue="#{schuelerCon.filteredKlasse}"
                         emptyMessage="Kein Schüler gefunden!"

                         selection="#{schuelerCon.selectedKlasse}"
                         rowKey="#{schueler}"

                         style="width:800px;height:100px; text-align: center;"
                         >

                <f:facet name="header">
                    Schüler
                </f:facet>

                <p:column selectionMode="multiple" style="width:18px;"/>

                <p:column>
                    <f:facet name="header">Katalognummer</f:facet>
                    <h:outputText value="#{schueler.nr}"/>
                </p:column>
                <p:column filterBy="#{schueler.nachname}"  filterMatchMode="contains">
                    <f:facet name="header">Zuname</f:facet>
                    <h:outputText value="#{schueler.nachname}"/>
                </p:column>
                <p:column filterBy="#{schueler.vorname}"  filterMatchMode="contains">
                    <f:facet name="header">Vorname</f:facet>
                    <h:outputText value="#{schueler.vorname}"/>
                </p:column>
            </p:dataTable>
        </h:form>

        <h:form id="buttonForm" style="position: absolute; top: 100px; left: 5px;">
            <h:panelGrid columns="3" cellpadding="5">
                <p:commandButton value="Show" type="button" update=":sdataForm" onclick="PF('dlg1').show();" />

                <p:commandButton value="Add" type="button" onclick="PF('dlg2').show();" />

                <p:commandButton value="Delete" type="button" onclick="PF('dlg3').show();" actionListener="#{schuelerCon.deleteSchueler()}" update=":dataForm"/>
            </h:panelGrid>

            <p:dialog header="Show Dialog" widgetVar="dlg1" minHeight="40">
                <h:form id="sdataForm">
                    <p:dataTable value="#{schuelerCon.selectedKlasse}"
                                 var="sschueler"

                                 style="text-align: center;"
                                 >

                        <p:column>
                            <f:facet name="header">Katalognummer</f:facet>
                            <h:outputText value="#{sschueler.nr}"/>
                        </p:column>
                        <p:column>
                            <f:facet name="header">Zuname</f:facet>
                            <h:outputText value="#{sschueler.nachname}"/>
                        </p:column>
                        <p:column>
                            <f:facet name="header">Vorname</f:facet>
                            <h:outputText value="#{sschueler.vorname}"/>
                        </p:column>
                    </p:dataTable>
                </h:form>
            </p:dialog>

            <p:dialog header="Add Dialog" widgetVar="dlg2" modal="true" height="150" width="320">
                <h:panelGrid  columns="3">
                    <h:outputLabel value="Vorname: "/>
                    <h:inputText  id="vn" value="#{schuelerCon.newSchueler.vorname}"
                                  required="true" requiredMessage="Vorname erforderlich!"/>
                    <h:message for="vn" />

                    <h:outputLabel value="Zuname: "/>
                    <h:inputText id="zn" value="#{schuelerCon.newSchueler.nachname}"
                                 required="true" requiredMessage="Zuname erforderlich!" />
                    <h:message for="zn" />

                    <h:outputLabel value="Weiblich: "/>
                    <h:selectBooleanCheckbox id="sex2" value="#{schuelerCon.weiblich}" />
                    <h:message for="sex2" />

                    <p:commandButton id="cb" actionListener="#{schuelerCon.addSchueler()}"  value="Save"/>
                </h:panelGrid>
            </p:dialog>

            <p:dialog header="Delete Dialog" widgetVar="dlg3" showEffect="explode" hideEffect="bounce" height="50">
                <p:outputLabel value="Schüler erfolgreich gelöscht"/>
            </p:dialog>
        </h:form>
    </h:body>
</html>