程序包 org.hibernate.jpa.internal.util

类 PersistenceUtilHelper

java.lang.Object

org.hibernate.jpa.internal.util.PersistenceUtilHelper

public final class PersistenceUtilHelper
extends Object

Central delegate for handling calls from:

• PersistenceUtil.isLoaded(Object)
• PersistenceUtil.isLoaded(Object, String)
• ProviderUtil.isLoaded(Object)
• ProviderUtil.isLoadedWithReference(Object, String)
• ProviderUtil.isLoadedWithoutReference(Object, String)li>

作者:

Emmanuel Bernard, Hardy Ferentschik, Steve Ebersole

嵌套类概要

嵌套类

修饰符和类型	类	说明
static interface	PersistenceUtilHelper.AttributeAccess
static class	PersistenceUtilHelper.AttributeExtractionException
static class	PersistenceUtilHelper.ClassMetadataCache
static class	PersistenceUtilHelper.FieldAttributeAccess
static class	PersistenceUtilHelper.MetadataCache	Cache hierarchy and member resolution in a weak hash map
static class	PersistenceUtilHelper.MethodAttributeAccess

方法概要

修饰符和类型	方法	说明
static javax.persistence.spi.LoadState	isLoaded(Object reference)	Determine if the given object reference represents loaded state.
static javax.persistence.spi.LoadState	isLoadedWithoutReference(Object entity, String attributeName, PersistenceUtilHelper.MetadataCache cache)	Is the given attribute (by name) loaded?
static javax.persistence.spi.LoadState	isLoadedWithReference(Object entity, String attributeName, PersistenceUtilHelper.MetadataCache cache)	Is the given attribute (by name) loaded?

从类继承的方法 java.lang.Object

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

方法详细资料

isLoaded

public static javax.persistence.spi.LoadState isLoaded(Object reference)

Determine if the given object reference represents loaded state. The reference may be to an entity or a persistent collection.

Return is defined as follows:

1. If the reference is a HibernateProxy, we return LoadState.LOADED if LazyInitializer.isUninitialized() returns false; else we return LoadState.NOT_LOADED
2. If the reference is an enhanced (by Hibernate) entity, we return LoadState.LOADED if LazyAttributeLoadingInterceptor.hasAnyUninitializedAttributes() returns false; otherwise we return LoadState.NOT_LOADED
3. If the reference is a PersistentCollection, we return LoadState.LOADED if PersistentCollection.wasInitialized() returns true; else we return LoadState.NOT_LOADED
4. In all other cases we return LoadState.UNKNOWN

参数:

reference - The object reference to check.

返回:

The appropriate LoadState (see above)

isLoadedWithoutReference

public static javax.persistence.spi.LoadState isLoadedWithoutReference(Object entity,
                                                                       String attributeName,
                                                                       PersistenceUtilHelper.MetadataCache cache)

Is the given attribute (by name) loaded? This form must take care to not access the attribute (trigger initialization).

参数:

entity - The entity

attributeName - The name of the attribute to check

cache - The cache we maintain of attribute resolutions

返回:

The LoadState

isLoadedWithReference

public static javax.persistence.spi.LoadState isLoadedWithReference(Object entity,
                                                                    String attributeName,
                                                                    PersistenceUtilHelper.MetadataCache cache)

Is the given attribute (by name) loaded? This form must take care to not access the attribute (trigger initialization).

参数:

entity - The entity

attributeName - The name of the attribute to check

cache - The cache we maintain of attribute resolutions

返回:

The LoadState