Set vs Add methods

[rabidgremlin]

Hi All,

I have a curious problem. I am porting some existing code that uses another XML binding tool. This code uses uses "set" methods to associate different objects together. The port was thus pretty easy as there was a close correlation between the structure of the old code and the code that uses XmlBeans.

However when I do a test run, my XML is not being created correctly. After a couple of tests I have determined that the order in which you do the "sets" are important. This seems very odd to me (not to mention very fragile and error prone).

I have a small example:

With the following XSD:

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://testschema" xmlns:TestSchema=" http://testschema">
    <complexType name="Song">
        <sequence>
            <element name="Title" type="string"></element>
            <element name="length" type="duration"></element>
        </sequence>
    </complexType>

    <element name="Album">
        <complexType>
            <sequence>
                <element name="Songs" type="TestSchema:Song" minOccurs="1" maxOccurs="unbounded">
                </element>
            </sequence>
            <attribute name="Title" type="string" use="required"></attribute>
            <attribute name="Year" type="string" use="required"></attribute>
        </complexType>
    </element>
</schema>

and the following code:

import org.apache.xmlbeans.GDuration;

import testschema.AlbumDocument;
import testschema.Song;
import testschema.AlbumDocument.Album;

public class TestSchema
{

  public static void main(String[] args)
  {
    try
    {
      testWithAdd();
      testWithSet1();
      testWithSet2();
    }
    catch(Exception e)
    {
      System.out.println("Oops -> " + e);
    }
  }
 
  public static void testWithAdd()throws Exception
  {
    AlbumDocument doc = AlbumDocument.Factory.newInstance();
   
    Album album = doc.addNewAlbum();
    album.setTitle("FloodLand");
    album.setYear("1990");
   
    Song tempSong = album.addNewSongs();
    tempSong.setTitle("Dominion/Mother Russia");
    tempSong.setLength( new GDuration(1,2,4,5,10,12,15,null) );
   
    tempSong = album.addNewSongs();
    tempSong.setTitle("Flood I");
    tempSong.setLength( new GDuration(1,2,2,5,10,12,15,null) );
   
   
    System.out.println("Add: isValid=" + doc.validate());
    System.out.println("Add: " + doc.xmlText());   
  }
 
  public static void testWithSet1()throws Exception
  {
    AlbumDocument doc = AlbumDocument.Factory.newInstance();
   
    Album album = Album.Factory.newInstance();
    // NOTE SET HERE
    doc.setAlbum(album);
    album.setTitle("FloodLand");
    album.setYear("1990");
   
    Song[] songs = new Song[2];
       
    songs[0] = Song.Factory.newInstance();   
    songs[0].setTitle("Dominion/Mother Russia");
    songs[0].setLength( new GDuration(1,2,4,5,10,12,15,null) );
   
    songs[1] = Song.Factory.newInstance();
    songs[1].setTitle("Flood I");
    songs[1].setLength( new GDuration(1,2,2,5,10,12,15,null) );
   
    album.setSongsArray(songs);   
   
    System.out.println("Set1: isValid=" + doc.validate());
    System.out.println("Set1: " + doc.xmlText());   
  }
 
  public static void testWithSet2()throws Exception
  {
    AlbumDocument doc = AlbumDocument.Factory.newInstance();
   
    Album album = Album.Factory.newInstance();   
    album.setTitle("FloodLand");
    album.setYear("1990");
   
    Song[] songs = new Song[2];
       
    songs[0] = Song.Factory.newInstance();   
    songs[0].setTitle("Dominion/Mother Russia");
    songs[0].setLength( new GDuration(1,2,4,5,10,12,15,null) );
   
    songs[1] = Song.Factory.newInstance();
    songs[1].setTitle("Flood I");
    songs[1].setLength( new GDuration(1,2,2,5,10,12,15,null) );
   
    album.setSongsArray(songs);  
    // NOTE SET HERE
    doc.setAlbum(album);
   
    System.out.println("Set2: isValid=" + doc.validate());
    System.out.println("Set2: " + doc.xmlText());   
  }
}

I get the following results:

Add: isValid=true
Add: <tes:Album Title="FloodLand" Year="1990" xmlns:tes="http://testschema"><Songs><Title>Dominion/Mother Russia</Title><length>P2Y4M5DT10H12M15S</length></Songs><Songs><Title>Flood I</Title><length>P2Y2M5DT10H12M15S</length></Songs></tes:Album>
Set1: isValid=false
Set1: <tes:Album xmlns:tes="http://testschema"/>
Set2: isValid=true
Set2: <tes:Album Title="FloodLand" Year="1990" xmlns:tes="http://testschema"><Songs><Title>Dominion/Mother Russia</Title><length>P2Y4M5DT10H12M15S</length></Songs><Songs><Title>Flood I</Title><length>P2Y2M5DT10H12M15S</length></Songs></tes:Album>

Note how the output of the testWithSet1() method is not valid where as the output of testWithSet2() is. The only difference is the placement of the "doc.setAlbum(album);" line.

Anyone have any idea as to why this is and is there something I am not doing ?

Jonathan