<hibernate-mapping package="toe">
   
   <class name="Foot">
      <id name="id" type="long" access="field">
         <generator class="native"/>
      </id>
            
      <property name="isLeft"     access="field"/>
      <property name="stinkLevel" access="field"/>
      
      <list name="toes" cascade="all-delete-orphan" access="field">
         <key   column="FOOT_ID"/>
         <index column="INDEX"/>
         
         <one-to-many class="Toe"/>
      </list>
   </class>
   
   
   <class name="Toe">
      <id name="id" type="long" access="field">
         <generator class="native"/>
      </id>

      <property name="name"        access="field"/>
      <property name="millimeters" access="field"/>

      <many-to-one name="nail"
            class="Nail"
            column="NAIL_ID"
            cascade="all"
            unique="true"
            access="field"/>
   </class>
   
   
   <class name="Nail">
      <id name="id" type="long" access="field">
         <generator class="native"/>
      </id>

      <property name="isPainted" access="field"/>
      <property name="color"     access="field"/>
   </class>
   
   
</hibernate-mapping>

<hibernate-mapping package="toe">
   
   <class name="Foot">
      <id name="id" type="long" access="field">
         <generator class="native"/>
      </id>
            
      <property name="isLeft"     access="field"/>
      <property name="stinkLevel" access="field"/>
      
      <list name="toes" access="field">
         <key   column="FOOT_ID"/>
         <index column="INDEX"/>
         
         <composite-element class="Toe">
            <property name="name"        access="field"/>
            <property name="millimeters" access="field"/>
            <many-to-one name="nail"
                  class="Nail"
                  column="NAIL_ID"
                  cascade="all"
                  unique="true"
                  access="field"/>
         </composite-element>
      </list>
   </class>
   
   <class name="Nail">
      <id name="id" type="long" access="field">
         <generator class="native"/>
      </id>

      <property name="isPainted" access="field"/>
      <property name="color"     access="field"/>
   </class>
   
</hibernate-mapping>

package toe;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

/**
* This is like SwitchingScan in our real application.
* <p>
* The purpose of this class is to demonstrate that mapping class Toe
* as a value object in Hibernate gives a TransientObjectException,
* while mapping it as a entity object does not.  In both situations
* class Nail is mapped as an entity object and there is a one-way
* (from Toe to Nail), one-to-one, relationship between Toe and Nail.</p>
*/
public class Foot
{
  long      id = -1L;
  boolean   isLeft;
  int       stinkLevel;
  List<Toe> toes = new ArrayList<Toe>();
 
  public static void main(String[] args)
  {
    Foot leftFoot = new Foot();
   
    leftFoot.isLeft     = true;
    leftFoot.stinkLevel = 7;
   
    String[] names  = {"Porky", "Petunia", "Ms. Piggy", "Zaentz", "Little Piggy"};
    String[] colors = {"Red", "White", "Blue", "Purple", "Black"};
    double size = 40.0;
    for (int t=0; t < 5; t++)
    {
      Nail nail      = new Nail();
      nail.isPainted = true;
      nail.color     = colors[t];
     
      Toe toe         = new Toe();
      toe.name        = names[t];
      toe.millimeters = size;
      toe.nail        = nail;
     
      leftFoot.toes.add(toe);
     
      size -= 5.0;
    }
   
    Dao dao = new Dao();
    dao.save(leftFoot);
    dao.close();
  }
}


/** This is like SwitchSetting in our real application. */
class Toe
{
  //id is here only because crafting Toe as a value object didn't work as hoped
  long   id = -1L;
 
  String name;
  double millimeters;
  Nail   nail;
}


/** This is like Source in our real application. */
class Nail
{
  long    id = -1L;
  boolean isPainted;
  String  color;
}




class Dao
{
  private SessionFactory sessionFactory;
 
  private SessionFactory getSessionFactory()
  {
    if (sessionFactory == null)
    {
      try
      {
        Configuration conf = new Configuration();
        conf.configure("Feet.cfg.xml");
       
        sessionFactory = conf.buildSessionFactory();
      }
      catch (HibernateException ex)
      {
        System.out.println("Problem getting SessionFactory.");
        ex.printStackTrace();
        System.exit(-1);
      }
    }
   
    return sessionFactory;
  }
 
  void save(Foot foot)
  {
    Session session = getSessionFactory().openSession();
    Transaction tran = null;
   
    try
    {
      tran = session.beginTransaction();

      session.saveOrUpdate(foot);
     
      tran.commit();
    }
    catch (Exception ex)
    {
      if (tran != null)
        tran.rollback();
      System.out.println("Problem saving Foot.");
      ex.printStackTrace();
      System.exit(-1);
    }
    finally
    {
      session.close();
    }
  }
 
  void close()
  {
    getSessionFactory().close();
  }
}