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## org.hibernate.engine
Class ForeignKeys

    java.lang.Object
      org.hibernate.engine.ForeignKeys

    public final class ForeignKeys

extends Object

Algorithms related to foreign key constraint transparency

Author:
  Gavin King

Nested Class Summary
`static class` | `ForeignKeys.Nullifier`

Method Summary
`static Serializable` | `getEntityIdentifierIfNotUnsaved(String entityName, Object object, SessionImplementor session)` Return the identifier of the persistent or transient object, or throw an exception if the instance is "unsaved" Used by OneToOneType and ManyToOneType to determine what id value should be used for an object that may or may not be associated with the session.
`static boolean` | `isNotTransient(String entityName, Object entity, Boolean assumed, SessionImplementor session)` Is this instance persistent or detached? If `assumed` is non-null, don't hit the database to make the determination, instead assume that value; the client code must be prepared to "recover" in the case that this assumed result is incorrect.
`static boolean` | `isTransient(String entityName, Object entity, Boolean assumed, SessionImplementor session)` Is this instance, which we know is not persistent, actually transient? If `assumed` is non-null, don't hit the database to make the determination, instead assume that value; the client code must be prepared to "recover" in the case that this assumed result is incorrect.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### isNotTransient

    public static boolean isNotTransient(String entityName,
                                         Object entity,
                                         Boolean assumed,
                                         SessionImplementor session)
                                  throws HibernateException

  Is this instance persistent or detached? If `assumed` is non-null, don't hit the database to make the determination, instead assume that value; the client code must be prepared to "recover" in the case that this assumed result is incorrect.

  Throws:
    `HibernateException`

### isTransient

    public static boolean isTransient(String entityName,
                                      Object entity,
                                      Boolean assumed,
                                      SessionImplementor session)
                               throws HibernateException

  Is this instance, which we know is not persistent, actually transient? If `assumed` is non-null, don't hit the database to make the determination, instead assume that value; the client code must be prepared to "recover" in the case that this assumed result is incorrect.

  Throws:
    `HibernateException`

### getEntityIdentifierIfNotUnsaved

    public static Serializable getEntityIdentifierIfNotUnsaved(String entityName,
                                                               Object object,
                                                               SessionImplementor session)
                                                        throws HibernateException

  Return the identifier of the persistent or transient object, or throw an exception if the instance is "unsaved" Used by OneToOneType and ManyToOneType to determine what id value should be used for an object that may or may not be associated with the session. This does a "best guess" using any/all info available to use (not just the EntityEntry).

  Throws:
    `HibernateException`

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