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2 Replies Latest reply: Mar 11, 2013 2:39 PM by bkazar RSS

SDO_Geometry -> J3D_Geometry Conundum

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Hi all,

I am new to Oracle Spatial and Java, and also to this forum so apologies for any faux pas or ignorances! I am writing a program to place solar panels on roofs, using Oracle as a backend and java to do the calculations.

At the moment, I have successfully managed to connect to my database and extract the data using the cod below. I want to use Element_Extractor to decompose my 3D building into separate faces stored as JGeometry so that I can then carry out mathematical functions on the coordinates after. That is where I am stuck! The section ""while ((g = e.nextElement(inner_outer)) != null)"" is where I am stumped.

Any suggestions/links/ideas/example code would be much appreciated! Many Thanks,


     public void loadcoords(String kmltablename) {
          try {
               conn = createCon();
               String query = "select geometry from " + kmltablename;
               Statement stmt1 = createStatement();
               ResultSet rs = stmt1.executeQuery(query);
               System.out.println("Result Set = " + rs);
               while ( {
                    //System.out.println("rs.getBytes = " + rs.getBytes(1));
                    byte[] image = rs.getBytes(1);

                    // convert image into a JGeometry object using the SDO pickler
                    JGeometry building = JGeometry.load(image);
                    J3D_Geometry building3D = new J3D_Geometry(building.getType(),
                              building.getSRID(), building.getElemInfo(),

                    // Create new extractor
                    ElementExtractor e = new ElementExtractor(building3D, 0,

                    // Geometry to receive extracted element(s)
                    J3D_Geometry g;

                    // Used to receive the type of element (1=outer, 2=inner)
                    int inner_outer[] = { 0 };
                    // Extract the elements
                    while ((g = e.nextElement(inner_outer)) != null) {
                         // Process extracted element
                         String decomp = g.toStringFull();
          } catch (ClassNotFoundException e) {
               System.out.println("Class Not Found Error");
          } catch (SQLException e) {
               System.out.println("SQL Exception Error");
          } catch (Exception e) {// Catch exception if any
               System.err.println("Error: " + e.getMessage());



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