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

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.HashMap<DatabaseMapping,DatabaseQuery>	selectionQueriesForAllObjects Selection queries from read all mappings will be cached and re-used.

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

childDescriptors, descriptor, implementorDescriptor, implementorDescriptorClassName, parentDescriptors, parentInterfaceNames, parentInterfaces

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addSelectionQuery(ForeignReferenceMapping cloneMapping, ForeignReferenceMapping sourceMapping, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL:
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.
protected void	prepareManyToManySelectionQuery(ManyToManyMapping sourceMapping, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL:
protected void	prepareOneToManySelectionQuery(OneToManyMapping sourceMapping, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL:
protected void	prepareOneToOneSelectionQuery(OneToOneMapping sourceMapping, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL:
protected void	prepareSelectionQuery(DatabaseMapping sourceMapping, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: 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.
protected java.lang.Object	selectAllObjects(ReadAllQuery query) INTERNAL: Select all objects for a concrete descriptor.
protected java.lang.Object	selectOneObject(ReadObjectQuery query) INTERNAL: Select one object of any concrete subclass.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

selectionQueriesForAllObjects

protected java.util.HashMap<DatabaseMapping,DatabaseQuery> selectionQueriesForAllObjects

Selection queries from read all mappings will be cached and re-used. E.G Entity A has a 1-M to Entity D (who has a subclass Entity E). We will build a selection query to Entity E based on the selection query from the 1-M mapping from Entity A to Entity D.

Constructor Detail

TablePerClassPolicy

public TablePerClassPolicy(ClassDescriptor descriptor)

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

Method Detail

addSelectionQuery

protected void addSelectionQuery(ForeignReferenceMapping cloneMapping,
                     ForeignReferenceMapping sourceMapping,
                     org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL:

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)

prepareManyToManySelectionQuery

protected void prepareManyToManySelectionQuery(ManyToManyMapping sourceMapping,
                                   org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL:

prepareOneToManySelectionQuery

protected void prepareOneToManySelectionQuery(OneToManyMapping sourceMapping,
                                  org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL:

prepareOneToOneSelectionQuery

protected void prepareOneToOneSelectionQuery(OneToOneMapping sourceMapping,
                                 org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL:

prepareSelectionQuery

protected void prepareSelectionQuery(DatabaseMapping sourceMapping,
                         org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: 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 as the key. A prepare is performed for each child of the hierarchy.

selectAllObjects

protected java.lang.Object selectAllObjects(ReadAllQuery query)

INTERNAL: Select all objects for a concrete descriptor.

Overrides:

selectAllObjects in class InterfacePolicy

selectOneObject

protected java.lang.Object selectOneObject(ReadObjectQuery query)
                                    throws DescriptorException

INTERNAL: Select one object of any concrete subclass.

Overrides:

selectOneObject in class InterfacePolicy

Throws:

DescriptorException