Как написать или экспортировать все слои из MapContent с несколькими слоями только в шейп-файл

Question

Я загружаю существующий файл shp, а затем добавляю точки, нажимая кнопку «Точка», затем нажимая на экран, затем нажатая точка будет сохранена в новом слое, затем я добавляю этот слой в MapContent.Далее я хочу экспортировать шейп-файл с двумя слоями. Я хочу сохранить все слои, объединенные в новый шейп-файл

package org.geotools;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JToolBar;
import javax.swing.filechooser.FileNameExtensionFilter;

import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.feature.DefaultFeatureCollection;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.geometry.DirectPosition2D;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.geotools.map.FeatureLayer;
import org.geotools.map.Layer;
import org.geotools.map.MapContent;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.swing.JMapFrame;
import org.geotools.swing.event.MapMouseEvent;
import org.geotools.swing.tool.CursorTool;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.MultiPoint;
import org.locationtech.jts.geom.Point;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

//Class MapUI  
public class MapUI {    
    private static File sourceFile;
    private SimpleFeatureSource featureSource;
    private static MapContent map;
    private static JMapFrame mapFrame;
    private static JButton btnDrawPoint;
    private static JButton btnExport;

    /*
     * method 
     */
    public void addControls() throws IOException {
        JFileChooser jfc = new JFileChooser("./shapeFile/");
        jfc.setDialogTitle("Select an file shp");
        jfc.setAcceptAllFileFilterUsed(false);
        FileNameExtensionFilter filter = new FileNameExtensionFilter("shp file", "shp");
        jfc.addChoosableFileFilter(filter);

        int returnValue = jfc.showOpenDialog(null);
        if (returnValue == JFileChooser.APPROVE_OPTION) {
            sourceFile = jfc.getSelectedFile();
        } else {
            return;
        }
        FileDataStore store = FileDataStoreFinder.getDataStore(sourceFile);
        featureSource = store.getFeatureSource();

        System.out.println(featureSource);
        // Create a map context and add our shapefile to it
        map = new MapContent();
        map.setTitle("Quickstart");

        Style style = SLD.createSimpleStyle(featureSource.getSchema());
        Layer layer = new FeatureLayer(featureSource, style);
        layer.setTitle("Layer 1");
        map.layers().add(layer);

        mapFrame = new JMapFrame(map);
        mapFrame.enableToolBar(true);
        mapFrame.enableStatusBar(true);

        JToolBar toolBar = mapFrame.getToolBar();
        btnDrawPoint = new JButton("Point");
        toolBar.add(btnDrawPoint);
        btnExport = new JButton("export");
        toolBar.add(btnExport);
    }

   // Method add event click mouse       
    public void addEvent() {
        /*
         * when clicking the button will allow adding points 
         * on the map by clicking on the map location
         */
        btnDrawPoint.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                mapFrame.getMapPane().setCursorTool(new CursorTool() {
                    @Override
                    public void onMouseClicked(MapMouseEvent ev) {
                        drawPoint(ev);
                    }
                });
            }
        });
        /*
         * button export file
         */
        btnExport.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                exportFile();

            }

        });
    }
    /*
     * method show map
     */
    public void showWindow() {
//      mapFrame.showMap(map);
        mapFrame.setSize(800, 600);
        mapFrame.setVisible(true);
    }

    //Method draw point
    private void drawPoint(MapMouseEvent ev) {
        DirectPosition2D pos = ev.getMapPosition();
        double x = pos.x;
        double y = pos.y;

        SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
        builder.setName("MyFeatureType");
        builder.setCRS(DefaultGeographicCRS.WGS84); // set crs
        builder.add("location", MultiPoint.class); // add geometry

        // build the type
        SimpleFeatureType TYPE = builder.buildFeatureType();
        // create features using the type defined
        SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(TYPE);

        GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);
        Coordinate coord = new Coordinate(x, y);
        Point point = geometryFactory.createPoint(coord);

        DefaultFeatureCollection featureCollection = new DefaultFeatureCollection();

        featureBuilder.add(point);
        SimpleFeature feature = featureBuilder.buildFeature("FeaturePoint" + point.getNumPoints());
        featureCollection.add(feature); // Add feature 1, 2, 3, etc

        Style style = SLD.createPointStyle("circle", Color.BLUE, Color.BLUE, 0.3f, 15);
        Layer layer = new FeatureLayer(featureCollection, style);

        layer.setTitle("Click Point");
        map.layers().add(layer);

    }

Я хочу экспортировать файл здесь

    private void exportFile() {
//      I don't know how to write here

    }

    public static void main(String[] args) throws IOException {
        MapUI mapUI = new MapUI();
        mapUI.addControls();
        mapUI.addEvent();
        mapUI.showWindow();
    }
}