org.eclipse.persistence.descriptors

Class TablePerClassPolicy

java.lang.Object

org.eclipse.persistence.descriptors.InterfacePolicy

org.eclipse.persistence.descriptors.TablePerClassPolicy

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class TablePerClassPolicy
extends InterfacePolicy
implements java.io.Serializable, java.lang.Cloneable

Purpose: Provides the functionality to support a TABLE_PER_CLASS inheritance strategy. Resolves relational mappings and querying.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TablePerClassPolicy(ClassDescriptor descriptor) INTERNAL: Create a new policy.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isTablePerClassPolicy() INTERNAL:
void	prepareChildrenSelectionQuery(DatabaseMapping sourceMapping, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: This method is called from individual mappings during their initialization.

Methods inherited from class org.eclipse.persistence.descriptors.InterfacePolicy

addChildDescriptor, addParentDescriptor, addParentInterface, addParentInterfaceName, convertClassNamesToClasses, getChildDescriptors, getImplementorDescriptor, getImplementorDescriptorClassName, getParentDescriptors, getParentInterfaceNames, getParentInterfaces, hasChild, initialize, isInterfaceChildDescriptor, selectAllObjectsUsingMultipleTableSubclassRead, selectOneObjectUsingMultipleTableSubclassRead, setDescriptor, setImplementorDescriptor, setImplementorDescriptorClassName, setParentInterfaceNames, setParentInterfaces, usesImplementorDescriptor

Methods inherited from class java.lang.Object

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

Constructor Detail

TablePerClassPolicy

public TablePerClassPolicy(ClassDescriptor descriptor)

INTERNAL: Create a new policy. Only descriptors involved in inheritance should have a policy.

Method Detail

isTablePerClassPolicy

public boolean isTablePerClassPolicy()

INTERNAL:

Overrides:

isTablePerClassPolicy in class InterfacePolicy

prepareChildrenSelectionQuery

public void prepareChildrenSelectionQuery(DatabaseMapping sourceMapping,
                                 org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: This method is called from individual mappings during their initialization. If the mapping is to a class within a TABLE_PER_CLASS inheritance hierarchy, what this method will do is prepare a selection query to execute for every child descriptor in the hierarchy. The selection queries are created by cloning the source mapping, updating the necessary database fields on the mapping and then initializing the mapping to create the internal selection query. This query is then cached where needed using the source mapping's selection query name as the key.

See Also:

selectAllObjects(ReadAllQuery), selectOneObject(ReadObjectQuery)