Tree DragDrop

package org.primefaces.showcase.view.data.tree;

import org.primefaces.event.TreeDragDropEvent;
import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

import java.io.Serializable;

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

@Named("treeDNDView")
@ViewScoped
public class DragDropView implements Serializable {

    private TreeNode root1;

    private TreeNode root2;

    private TreeNode selectedNode1;

    private TreeNode selectedNode2;

    @PostConstruct
    public void init() {
        root1 = new DefaultTreeNode("Root", null);
        TreeNode node0 = new DefaultTreeNode("Node 0", root1);
        TreeNode node1 = new DefaultTreeNode("Node 1", root1);
        TreeNode node2 = new DefaultTreeNode("Node 2", root1);

        TreeNode node00 = new DefaultTreeNode("Node 0.0", node0);
        TreeNode node01 = new DefaultTreeNode("Node 0.1", node0);

        TreeNode node10 = new DefaultTreeNode("Node 1.0", node1);
        TreeNode node11 = new DefaultTreeNode("Node 1.1", node1);

        TreeNode node000 = new DefaultTreeNode("Node 0.0.0", node00);
        TreeNode node001 = new DefaultTreeNode("Node 0.0.1", node00);
        TreeNode node010 = new DefaultTreeNode("Node 0.1.0", node01);

        TreeNode node100 = new DefaultTreeNode("Node 1.0.0", node10);

        root2 = new DefaultTreeNode("Root2", null);
        TreeNode item0 = new DefaultTreeNode("Item 0", root2);
        TreeNode item1 = new DefaultTreeNode("Item 1", root2);
        TreeNode item2 = new DefaultTreeNode("Item 2", root2);

        TreeNode item00 = new DefaultTreeNode("Item 0.0", item0);
    }

    public TreeNode getRoot1() {
        return root1;
    }

    public TreeNode getRoot2() {
        return root2;
    }

    public TreeNode getSelectedNode1() {
        return selectedNode1;
    }

    public void setSelectedNode1(TreeNode selectedNode1) {
        this.selectedNode1 = selectedNode1;
    }

    public TreeNode getSelectedNode2() {
        return selectedNode2;
    }

    public void setSelectedNode2(TreeNode selectedNode2) {
        this.selectedNode2 = selectedNode2;
    }

    public void onDragDrop(TreeDragDropEvent event) {
        TreeNode dragNode = event.getDragNode();
        TreeNode dropNode = event.getDropNode();
        int dropIndex = event.getDropIndex();

        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO,
                "Dragged " + dragNode.getData(), "Dropped on " + dropNode.getData() + " at " + dropIndex);
        FacesContext.getCurrentInstance().addMessage(null, message);
    }
}