Building TreeNode from DataBase PrimeFaces

Question

I found the answer here the code of my recursive method for to build a TreeNode from DataBase and to build a Menu bar:

public void recursivo(List<Menustab> liste, int id, TreeNode node) {
    subList2 = new ArrayList<Menustab>();
    subList2 = subMenus(id);
    for (Menustab k : subList2) {
        TreeNode childNode = new DefaultTreeNode(k.getTitulo(), node);
        recursivo(subList2, k.getId(), childNode);

    }

}

public static List<Menustab> subMenus(int i) {
    listaHijos = new ArrayList<Menustab>();
    for (Menustab k : getListaMenus()) {
        if (k.getPadre() == i) {
            listaHijos.add(k);
        }
    }
    return listaHijos;
}

My view with menuBar:

<h:form >


        <div id="header" align="left">

            <p:menubar  autoDisplay="false"> 
                <c:forEach items="#{constructorMenuMB.root.children}" var="nodos" >

                    <p:submenu   label="#{nodos.getData().toString()}"   >

                        <c:forEach items="#{nodos.children}" var="hojas">

                            <c:if test="#{hojas.isLeaf()==false}">


                                <p:submenu  label="#{hojas.getData().toString()}"  >




                                    <c:forEach items="#{hojas.children}" var="menus">



                                        <c:when test="#{menus.leaf}">
                                            <c:if test="#{menus.leaf==false}">
                                                <p:submenu  label="#{menus.getData().toString()}" >

                                                    <c:forEach items="#{menus.children}" var="menus2">
                                                        <p:menuitem  value="#{menus2.getData().toString()}"  ajax="false" />
                                                    </c:forEach>
                                                </p:submenu>
                                            </c:if>
                                            <c:if test="#{menus.leaf}">
                                                <p:menuitem value="#{menus.getData().toString()}"  ajax="false" />
                                            </c:if>
                                        </c:when>

                                    </c:forEach>



                                </p:submenu>

                            </c:if>

                            <c:if test="#{hojas.isLeaf()==true}">

                                <p:menuitem value="#{hojas.getData().toString()}"  ajax="false" />


                            </c:if>


                        </c:forEach>


                        <c:if test="#{nodos.getData().toString()=='Favoritos'}">

                            <p:menuitem value="Agregar Favorito" action="verPrueba"  ajax="false"/>
                        </c:if>



                    </p:submenu>

                </c:forEach>


            </p:menubar>



        </div>



    </h:form>

and now my complete bean:

public class ConstructorMenuMB {

private TreeNode root = new DefaultTreeNode("Root", null);
private static List<Menustab> listaMenus;
private static List<Menustab> listaHijos;
private List<Menustab> subList2;

@EJB
public MenuSB sb;

/**
 * Creates una nueva instancia de ConstructorMenuMB
 */
public ConstructorMenuMB() {
}

@PostConstruct
public void construirMenu() {
    listaMenus = new ArrayList<Menustab>();
    listaMenus = sb.consultarArbolMenus();
    recursivo(listaMenus, 1, root);
}

/**
 * Método recursivo para construir un árbol(TreeNode) desde una lista de arreglos de
 * cadenas obtenida desde la base de datos.
 *
 * @param ArrayList<String[]> lista de menus.
 * @return No devuelve ningun valor.
 * @throws No dispara ninguna excepcion.
 */
public void recursivo(List<Menustab> liste, int id, TreeNode node) {
    subList2 = new ArrayList<Menustab>();
    subList2 = subMenus(id);
    for (Menustab k : subList2) {
        TreeNode childNode = new DefaultTreeNode(k.getTitulo(), node);
        recursivo(subList2, k.getId(), childNode);

    }

}

public static List<Menustab> subMenus(int i) {
    listaHijos = new ArrayList<Menustab>();
    for (Menustab k : getListaMenus()) {
        if (k.getPadre() == i) {
            listaHijos.add(k);
        }
    }
    return listaHijos;
}

public static List<Menustab> getListaMenus() {
    return listaMenus;
}


public TreeNode getRoot() {
    return root;
}

}

and my session bean where use the entity manager for consult my table with menus:

public class MenuSB {
@PersistenceContext(unitName = "MenuGeneralPU")
private EntityManager em;


 public List<Menustab> consultarArbolMenus(){

    return em.createNamedQuery("Menustab.findAll").getResultList();

}

}

My entity for Menus:

public class Menustab implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@NotNull
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 50)
@Column(name = "titulo")
private String titulo;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 50)
@Column(name = "url")
private String url;
@Basic(optional = false)
@NotNull
@Column(name = "padre")
private int padre;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 50)
@Column(name = "icono")
private String icono;


public Menustab() {
}

public Menustab(Integer id) {
    this.id = id;
}

public Menustab(Integer id, String titulo, String url, int padre, String icono) {
    this.id = id;
    this.titulo = titulo;
    this.url = url;
    this.padre = padre;
    this.icono = icono;
}

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public String getTitulo() {
    return titulo;
}

public void setTitulo(String titulo) {
    this.titulo = titulo;
}

public String getUrl() {
    return url;
}

public void setUrl(String url) {
    this.url = url;
}

public int getPadre() {
    return padre;
}

public void setPadre(int padre) {
    this.padre = padre;
}

public String getIcono() {
    return icono;
}

public void setIcono(String icono) {
    this.icono = icono;
}

@Override
public int hashCode() {
    int hash = 0;
    hash += (id != null ? id.hashCode() : 0);
    return hash;
}

@Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof Menustab)) {
        return false;
    }
    Menustab other = (Menustab) object;
    if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
        return false;
    }
    return true;
}

@Override
public String toString() {
    return "Entidad.Menustab[ id=" + id + " ]";
}

}

and finally the structure of my table in database:

ID | Titulo | URL | Padre | Icono

I use the basic in my algoritm, the id 'ID' of one menu and its pattern 'PADRE' for to build a TreeNode and the title 'TITULO' for the text of menus, I'm working for to paint the icons.