@Entity
@Table(name = "FRWTSTPNT")
public class Parent {

   private String name;

   private int age;

   private String occupation;

   private Calendar dateOfBirth;

   private Set<Child> children;

   private String lastUpdateUser;

   private ParentPK parentPK;

   /**
    * For optimistic locking
    */
   private Calendar lastUpdateTime;

   public Parent() {

   }

   public Parent(ParentVO parentVO) throws SystemException, CreateException {

      this.age = parentVO.getAge();
      this.dateOfBirth = parentVO.getDateOfBirth().toGMTDate();
      this.occupation = parentVO.getOccupation();
      this.name = parentVO.getName();
      this.lastUpdateUser = parentVO.getLastUpdateUser();
      this.lastUpdateTime = parentVO.getLastUpdateTime();
      this.parentPK = new ParentPK();

      PersistenceController.getEntityManager().persist(this);
   }

   @Column(name = "PNTAGE")
   public int getAge() {
      return age;
   }

   public void setAge(int age) {
      this.age = age;
   }

   @OneToMany(cascade=CascadeType.REMOVE)
   @JoinColumns( { @JoinColumn(name = "PNTIDR", referencedColumnName = "PNTIDR") })
   public Set<Child> getChildren() {
      return children;
   }

   public void setChildren(Set<Child> children) {
      this.children = children;
   }

   @Column(name = "PNTDOB")
   @Temporal(TemporalType.DATE)
   public Calendar getDateOfBirth() {
      return dateOfBirth;
   }

   public void setDateOfBirth(Calendar dateOfBirth) {
      this.dateOfBirth = dateOfBirth;
   }

   @Column(name = "PNTNAM")
   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   @Column(name = "PNTOCP")
   public String getOccupation() {
      return occupation;
   }

   public void setOccupation(String occupation) {
      this.occupation = occupation;
   }

   @Column(name = "LSTUPDTIM")
   @Temporal(TemporalType.TIMESTAMP)
   @Version
   public Calendar getLastUpdateTime() {
      return lastUpdateTime;
   }

   public void setLastUpdateTime(Calendar lastUpdateTime) {
      this.lastUpdateTime = lastUpdateTime;
   }

   @Column(name = "LSTUPDUSR")
   public String getLastUpdateUser() {
      return lastUpdateUser;
   }

   public void setLastUpdateUser(String lastUpdateUser) {
      this.lastUpdateUser = lastUpdateUser;
   }

   @EmbeddedId
   @AttributeOverride(name = "id", column = @Column(name = "PNTIDR"))
   public ParentPK getParentPK() {
      return parentPK;
   }

   public void setParentPK(ParentPK parentPK) {
      this.parentPK = parentPK;
   }

   public static Parent find(long id) throws FinderException, SystemException {

      ParentPK parentPK = new ParentPK();
      parentPK.setId(id);
      Parent parent = PersistenceController.getEntityManager().find(
            Parent.class, parentPK);
      return parent;
   }

   public void remove() throws RemoveException, SystemException {

                // Call to a utility class that manages the session
      PersistenceController.getEntityManager().remove(this);
   }
}


@Embeddable
public class ParentPK implements Serializable {
   
   private long id;
   
   public long getId() {
      return id;
   }

   public void setId(long id) {
      this.id = id;
   }
   
   public boolean equals(Object other) {
      
      return this.hashCode() == other.hashCode();
   }
   
   public int hashCode() {

      return new StringBuilder().append(id).toString().hashCode();
   }   
}



@Entity
@Table(name = "FRWTSTCLD")
public class Child {

   private ChildPK childPK;
   
   private String name;
   
   private int age;
   
   private Calendar dateOfBirth;
   
   private String lastUpdateUser;
   
   private Set<Child> children;
   
   /**
    * For optimistic locking
    */
   private Calendar lastUpdateTime;
   
   private long parentId;
   
   private long childId;

   public Child() {
      
      
   }
   
   public Child(ChildVO childVO, ParentPK parentPK) throws CreateException, SystemException {
      
      this.childPK = new ChildPK();
      childPK.setParentId(parentPK.getId());
      
      this.name = childVO.getName();
      this.age = childVO.getAge();
      this.dateOfBirth = childVO.getDateOfBirth();
      this.lastUpdateUser = childVO.getLastUpdateUser();
      
      PersistenceController.getEntityManager().persist(this);
   }

   public Child(ChildVO childVO, ChildPK pk)  throws CreateException, SystemException {
      
      this.childPK = new ChildPK();
      childPK.setParentId(pk.getId());
      
      this.childId = pk.getId();
      this.parentId = pk.getParentId();
      
      this.name = childVO.getName();
      this.age = childVO.getAge();
      this.dateOfBirth = childVO.getDateOfBirth();
      this.lastUpdateUser = childVO.getLastUpdateUser();
      
      PersistenceController.getEntityManager().persist(this);
   }

   @Column(name="CHDAGE")
   public int getAge() {
      return age;
   }

   public void setAge(int age) {
      this.age = age;
   }

   @Column(name="CHDDOB")
   @Temporal(TemporalType.DATE)   
   public Calendar getDateOfBirth() {
      return dateOfBirth;
   }

   public void setDateOfBirth(Calendar dateOfBirth) {
      this.dateOfBirth = dateOfBirth;
   }
   
   @Column(name = "CHDNAM")
   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   @Column(name = "LSTUPDTIM")
   @Temporal(TemporalType.TIMESTAMP)
   @Version
   public Calendar getLastUpdateTime() {
      return lastUpdateTime;
   }

   public void setLastUpdateTime(Calendar lastUpdateTime) {
      this.lastUpdateTime = lastUpdateTime;
   }

   @Column(name = "LSTUPDUSR")   
   public String getLastUpdateUser() {
      return lastUpdateUser;
   }

   public void setLastUpdateUser(String lastUpdateUser) {
      this.lastUpdateUser = lastUpdateUser;
   }

   @EmbeddedId
   @AttributeOverrides(
      {
         @AttributeOverride(name = "parentId", column = @Column(name = "PNTIDR")),
         @AttributeOverride(name = "id", column = @Column(name = "CHDIDR"))
      }
   )
   public ChildPK getChildPK() {
      return childPK;
   }

   public void setChildPK(ChildPK childPK) {
      this.childPK = childPK;
   }

   public void remove() throws RemoveException, SystemException {
      PersistenceController.getEntityManager().remove(this);
   }

   @OneToMany
   @JoinColumns( {
         @JoinColumn(name = "PNTCHDIDR", referencedColumnName = "CHDIDR"),
         @JoinColumn(name = "PNTPNTIDR", referencedColumnName = "PNTIDR")
   })
   public Set<Child> getChildren() {
      return children;
   }
   

   public void setChildren(Set<Child> children) {
      this.children = children;
   }
   
   @Column(name = "PNTPNTIDR", nullable = false)
   public long getParentId() {
      return parentId;
   }

   public void setParentId(long parentId) {
      this.parentId = parentId;
   }

   @Column(name = "PNTCHDIDR", nullable = false)
   public long getChildId() {
      return childId;
   }

   public void setChildId(long childId) {
      this.childId = childId;
   }

}


@Embeddable
public class ChildPK implements Serializable {
   
   private long parentId;
   
   private long id;

   @Key(generator = "ID_GEN", startAt = "1")
   public long getId() {
      return id;
   }

   public void setId(long id) {
      this.id = id;
   }

   @KeyCondition(column = "PNTIDR")
   public long getParentId() {
      return parentId;
   }

   public void setParentId(long parentId) {
      this.parentId = parentId;
   }
   
   public boolean equals(Object other) {
      
      return (this.hashCode() == other.hashCode());
   }
   
   public int hashCode() {

      return new StringBuilder().append(parentId).append(id).toString().hashCode();
   }