[OpenMap Users] --- How to modify an .shp file ---

Hi,

I'm a newbie and my question is how to modify a Shapefile.
I mean e. g. add a new polygon or move one point of a polygon.

I think I can read and write shapefiles in the following way,
but what to do with the EsriGraphicList object ?

I simply want draw the Hungarian lake 'Balaton'
onto the 'dcwpo-browse' map.

Does it couse problem that I don't have any .dbf file for this .shp file ?

-----

import java.io.*;
import java.util.*;

import com.bbn.openmap.omGraphics.*;
import com.bbn.openmap.plugin.*;
import com.bbn.openmap.plugin.esri.*;
import com.bbn.openmap.dataAccess.shape.*;
import com.bbn.openmap.dataAccess.shape.input.*;
import com.bbn.openmap.dataAccess.shape.output.*;

public class Modify {

  File dbf;
  File shp;
  File shx;

  EsriGraphicList egl;
  EsriPlugIn epi;

  DbfTableModel dtm;
  
  public Modify () {

    // reading ...
    String path = "./hungary";

    dbf = new File(path + ".dbf");
    shp = new File(path + ".shp");
    shx = new File(path + ".shx");

    epi = new EsriPlugIn("Mo.", dbf.toURL(), shp.toURL(), shx.toURL());

    egl = epi.getEsriGraphicList();
    dtm = epi.getModel();

    ///////
    // what to do here ?
    ///////

    // writing ...
    String opath = "./modified";

    ShpOutputStream pos = new ShpOutputStream(new FileOutputStream(opath + ".shp"));
    ShxOutputStream xos = new ShxOutputStream(new FileOutputStream(opath + ".shx"));
    DbfOutputStream dos = new DbfOutputStream(new FileOutputStream(opath + ".dbf"));

    int[][] indexData = pos.writeGeometry(egl);
    xos.writeIndex(indexData, egl.getType(), egl.getExtents());
    dos.writeModel(epi.getModel());
  }

  public static void main (String args[]) {
    Modify m = new Modify();
  }
}

-----

Thanks,
Sass Bálint

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