package ejava.examples.orm.rel.annotated;
   
   import java.util.HashMap;
   import java.util.Map;
   
   import javax.persistence.*;
   
   /** 
    * This class provides an example of using the java.util.Map with 
   * relationships.
   */
  @Entity @Table(name="ORMREL_LIBRARY")
  public class Library {
      @Id @GeneratedValue
      private long id;
      @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
      @MapKey(name="id")
      private Map<Long, Borrower> borrowers = new HashMap<Long, Borrower>();
      
      public Library() {}
      public Library(long id) { this.id = id; }
  
      public long getId() { return id; }
      
      public Map<Long, Borrower> getBorrowers() { return borrowers; }
      public void setBorrowers(Map<Long, Borrower> borrowers) {
          this.borrowers = borrowers;
      }
  
      private String myInstance() {
          String s=super.toString();
          s = s.substring(s.lastIndexOf('.')+1);
          return s;
      }
  
      public String toString() {
          StringBuilder text = new StringBuilder(myInstance());
          text.append(", id=" + id);
          text.append(", borrowers(" + borrowers.size() + ")={");
          for(long bid: borrowers.keySet()) {
              text.append("id=" + bid + "{" +
                      borrowers.get(bid).getName() +
                      "}, ");
          }
          text.append("}");
          return text.toString();
      }
  
  }