package ejava.examples.orm.map.annotated;
   
   import java.util.HashMap;
   import java.util.Map;
   
   import javax.persistence.*;
   
   /**
    * This class represents a parent in a One-to-Many, uni-directional
   * relationship, relative to the parent. The OneManyChild
   * makes no reference to this relationship. Of note, there is no such
   * thing as a One-to-Many, bi-directional relationship, owned by the parent 
   * in JPA. All One-to-Many bi-directional relationships must be owned by
   * the child.
   */
  @Entity @Table(name="ORMMAP_ONEMANY_OWNPARENT")
  public class OneManyOwningParent {
      @Id @Column(name="ID")
      private String name;
  
      @ManyToMany
      @MapKey(name="name")
      @JoinTable(name="ORMMAP_OWNPARENT_INVCHILD_LINK",
          joinColumns=@JoinColumn(name="PARENT_ID"),
          inverseJoinColumns=@JoinColumn(name="CHILD_ID"))
      private Map<String, OneManyChild> ownedChildren =
              new HashMap<String, OneManyChild>();
      
      protected OneManyOwningParent() {}
      public OneManyOwningParent(String name) { this.name = name; }
      
      public String getName() { return name; }
      public void setName(String name) {
              this.name = name;
      }
      
      public Map<String, OneManyChild> getOwnedChildren() { return ownedChildren; }
      public void setOwnedChildren(Map<String, OneManyChild> ownedChildren) {
              this.ownedChildren = ownedChildren;
      }
      
      public String toString() {
          StringBuilder text = new StringBuilder();
          text.append(getClass().getName());
          text.append(", name=" + name);
          if (ownedChildren != null) {
                  text.append(", ownedChildren=" + ownedChildren);
          }		
          return text.toString();
      }
  }