ForeignKeyDirection


1   //$Id: ForeignKeyDirection.java,v 1.4 2005/06/05 05:09:58 oneovthafew Exp $
2   package org.hibernate.type;
3   
4   import java.io.Serializable  ;
5   
6   import org.hibernate.engine.Cascade;
7   
8   /**
9    * Represents directionality of the foreign key constraint
10   * @author Gavin King
11   */
12  public abstract class ForeignKeyDirection implements Serializable   {
13      protected ForeignKeyDirection() {}
14      /**
15       * Should we cascade at this cascade point?
16       * @see org.hibernate.engine.Cascade
17       */
18      public abstract boolean cascadeNow(int cascadePoint);
19  
20      /**
21       * A foreign key from child to parent
22       */
23      public static final ForeignKeyDirection FOREIGN_KEY_TO_PARENT = new ForeignKeyDirection() {
24          public boolean cascadeNow(int cascadePoint) {
25              return cascadePoint!=Cascade.BEFORE_INSERT_AFTER_DELETE;
26          }
27  
28          public String   toString() {
29              return "toParent";
30          }
31          
32          Object   readResolve() {
33              return FOREIGN_KEY_TO_PARENT;
34          }
35      };
36      /**
37       * A foreign key from parent to child
38       */
39      public static final ForeignKeyDirection FOREIGN_KEY_FROM_PARENT = new ForeignKeyDirection() {
40          public boolean cascadeNow(int cascadePoint) {
41              return cascadePoint!=Cascade.AFTER_INSERT_BEFORE_DELETE;
42          }
43  
44          public String   toString() {
45              return "fromParent";
46          }
47          
48          Object   readResolve() {
49              return FOREIGN_KEY_FROM_PARENT;
50          }
51      };
52  }
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