Package javax.persistence
Interface PersistenceUnitUtil
- All Superinterfaces:
PersistenceUtil
Utility interface between the application and the persistence
provider managing the persistence unit.
The methods of this interface should only be invoked on entity instances obtained from or managed by entity managers for this persistence unit or on new entity instances.
- Since:
- Java Persistence 2.0
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Method Summary
Modifier and TypeMethodDescriptiongetIdentifier
(Object entity) Return the id of the entity.boolean
Determine the load state of an entity belonging to the persistence unit.boolean
Determine the load state of a given persistent attribute of an entity belonging to the persistence unit.
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Method Details
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isLoaded
Determine the load state of a given persistent attribute of an entity belonging to the persistence unit.- Specified by:
isLoaded
in interfacePersistenceUtil
- Parameters:
entity
- entity instance containing the attributeattributeName
- name of attribute whose load state is to be determined- Returns:
- false if entity's state has not been loaded or if the attribute state has not been loaded, else true
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isLoaded
Determine the load state of an entity belonging to the persistence unit. This method can be used to determine the load state of an entity passed as a reference. An entity is considered loaded if all attributes for whichFetchType.EAGER
has been specified have been loaded.The
isLoaded(Object, String)
method should be used to determine the load state of an attribute. Not doing so might lead to unintended loading of state.- Specified by:
isLoaded
in interfacePersistenceUtil
- Parameters:
entity
- entity instance whose load state is to be determined- Returns:
- false if the entity has not been loaded, else true
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getIdentifier
Return the id of the entity. A generated id is not guaranteed to be available until after the database insert has occurred. Returns null if the entity does not yet have an id.- Parameters:
entity
- entity instance- Returns:
- id of the entity
- Throws:
IllegalArgumentException
- if the object is found not to be an entity
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