LoadContexts (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.engine.loading
Class LoadContexts

java.lang.Object
  org.hibernate.engine.loading.LoadContexts

public class LoadContexts
extends Object

Maps result-sets to specific contextual data related to processing that result-sets.

Implementation note: internally an IdentityMap is used to maintain the mappings; IdentityMap was chosen because I'd rather not be dependent upon potentially bad ResultSet#equals and {ResultSet#hashCode} implementations.

Considering the JDBC-redesign work, would further like this contextual info not mapped seperately, but available based on the result set being processed. This would also allow maintaining a single mapping as we could reliably get notification of the result-set closing...

Author:: Steve Ebersole

Constructor Summary

LoadContexts(PersistenceContext persistenceContext)
          Creates and binds this to the given persistence context.

Method Summary

void cleanup(ResultSet resultSet)


CollectionLoadContext getCollectionLoadContext(ResultSet resultSet)
          Get the CollectionLoadContext associated with the given ResultSet, creating one if needed.

EntityLoadContext getEntityLoadContext(ResultSet resultSet)


PersistenceContext getPersistenceContext()
          Retrieves the persistence context to which this is bound.

PersistentCollection locateLoadingCollection(CollectionPersister persister, Serializable ownerKey)
          Attempt to locate the loading collection given the owner's key.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LoadContexts

public LoadContexts(PersistenceContext persistenceContext)

Creates and binds this to the given persistence context.
Parameters:: persistenceContext - The persistence context to which this will be bound.

Method Detail

getPersistenceContext

public PersistenceContext getPersistenceContext()

Retrieves the persistence context to which this is bound.

Returns:: The persistence context to which this is bound.

getCollectionLoadContext

public CollectionLoadContext getCollectionLoadContext(ResultSet resultSet)

Get the CollectionLoadContext associated with the given ResultSet, creating one if needed.

Parameters:: resultSet - The result set for which to retrieve the context.
Returns:: The processing context.

locateLoadingCollection

public PersistentCollection locateLoadingCollection(CollectionPersister persister,
                                                    Serializable ownerKey)

Attempt to locate the loading collection given the owner's key. The lookup here occurs against all result-set contexts...

Parameters:: persister - The collection persister; ownerKey - The owner key
Returns:: The loading collection, or null if not found.

getEntityLoadContext

public EntityLoadContext getEntityLoadContext(ResultSet resultSet)

cleanup

public void cleanup(ResultSet resultSet)