org.hibernate.engine.internal
Class ForeignKeys

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

public final class ForeignKeys
extends Object

Algorithms related to foreign key constraint transparency

Nested Class Summary

static class

ForeignKeys.Nullifier

Method Summary

static NonNullableTransientDependencies	findNonNullableTransientEntities(String entityName, Object entity, Object[] values, boolean isEarlyInsert, SessionImplementor session) Find all non-nullable references to entities that have not yet been inserted in the database, where the foreign key is a reference to an unsaved transient entity.
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

findNonNullableTransientEntities

public static NonNullableTransientDependencies findNonNullableTransientEntities(String entityName,
                                                                                Object entity,
                                                                                Object[] values,
                                                                                boolean isEarlyInsert,
                                                                                SessionImplementor session)

Find all non-nullable references to entities that have not yet been inserted in the database, where the foreign key is a reference to an unsaved transient entity. .

Parameters:

entityName - - the entity name

entity - - the entity instance

values - - insertable properties of the object (including backrefs), possibly with substitutions

isEarlyInsert - - true if the entity needs to be executed as soon as possible (e.g., to generate an ID)

session - - the session

Returns:

the transient unsaved entity dependencies that are non-nullable, or null if there are none.