Package cz.cvut.kbss.jopa.sessions.descriptor

Class LoadStateDescriptorFactory

java.lang.Object

cz.cvut.kbss.jopa.sessions.descriptor.LoadStateDescriptorFactory

public class LoadStateDescriptorFactory
extends Object

Builds LoadStateDescriptors on various occasions.

Method Summary

Modifier and Type	Method	Description
static <T> LoadStateDescriptor<T>	create(T instance, EntityType<T> et)	Creates an instance descriptor which sets load status of attributes based on their value in the specified instance as follows:
static <T> LoadStateDescriptor<T>	createAllLoaded(T instance, EntityType<T> et)	Creates an instance descriptor which marks all attributes as loaded.
static <T> LoadStateDescriptor<T>	createAllUnknown(T instance, EntityType<T> et)	Creates an instance descriptor which marks all attributes except the identifier as having an unknown load state.
static <T> LoadStateDescriptor<T>	createCopy(T instance, LoadStateDescriptor<T> original)	Copies the load states from the specified original descriptor into a new descriptor for the specified instance.
static <T> LoadStateDescriptor<T>	createNotLoaded(T instance, EntityType<T> et)	Creates an instance descriptor which marks all attributes except the identifier as not loaded.

Methods inherited from class java.lang.Object

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

Method Details

createNotLoaded

public static <T> LoadStateDescriptor<T> createNotLoaded(T instance,
 EntityType<T> et)

Creates an instance descriptor which marks all attributes except the identifier as not loaded.

Type Parameters:

T - Instance type

Parameters:

instance - Instance to create descriptor for

et - Entity type of the instance

Returns:

Fresh instance descriptor

createAllLoaded

public static <T> LoadStateDescriptor<T> createAllLoaded(T instance,
 EntityType<T> et)

Creates an instance descriptor which marks all attributes as loaded.

Type Parameters:

T - Instance type

Parameters:

instance - Instance to create descriptor for

et - Entity type of the instance

Returns:

Fresh instance descriptor with all loaded

createAllUnknown

public static <T> LoadStateDescriptor<T> createAllUnknown(T instance,
 EntityType<T> et)

Creates an instance descriptor which marks all attributes except the identifier as having an unknown load state.

Type Parameters:

T - Instance type

Parameters:

instance - Instance to create descriptor for

et - Entity type of the instance

Returns:

Fresh instance descriptor

create

public static <T> LoadStateDescriptor<T> create(T instance,
 EntityType<T> et)

Creates an instance descriptor which sets load status of attributes based on their value in the specified instance as follows:

If the attribute value is not null, its status is set to LoadState.LOADED. If the value is null and the attribute fetch type is FetchType.EAGER, the status is also set to LOADED. Otherwise, the status is set to LoadState.UNKNOWN.

Type Parameters:

T - Instance type

Parameters:

instance - Instance to create descriptor for

et - Entity type of the instance

Returns:

Fresh instance descriptor

createCopy

public static <T> LoadStateDescriptor<T> createCopy(T instance,
 LoadStateDescriptor<T> original)

Copies the load states from the specified original descriptor into a new descriptor for the specified instance.

Type Parameters:

T - Instance type

Parameters:

instance - Instance to create descriptor for

original - Load state to copy

Returns:

Fresh instance descriptor with state copied from the specified one