com.sun.jdo.api.persistence.model.jdo

Class RelationshipElement

java.lang.Object

com.sun.jdo.api.persistence.model.jdo.PersistenceElement

com.sun.jdo.api.persistence.model.jdo.PersistenceMemberElement

com.sun.jdo.api.persistence.model.jdo.PersistenceFieldElement

com.sun.jdo.api.persistence.model.jdo.RelationshipElement

All Implemented Interfaces:

PersistenceElementProperties, Comparable

public class RelationshipElement
extends PersistenceFieldElement

Version:

%I%

Author:

raccah

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RelationshipElement.Impl Pluggable implementation of the storage of relationship element properties.

Field Summary

Fields

Modifier and Type	Field and Description
static int	AGGREGATE_ACTION Constant representing aggregate action.
static int	CASCADE_ACTION Constant representing cascade action.
static int	NONE_ACTION Constant representing no action.
static int	NULLIFY_ACTION Constant representing nullify action.
static int	RESTRICT_ACTION Constant representing restrict action.

Fields inherited from class com.sun.jdo.api.persistence.model.jdo.PersistenceFieldElement

DERIVED, PERSISTENT, TRANSIENT

Fields inherited from interface com.sun.jdo.api.persistence.model.jdo.PersistenceElementProperties

PROP_CARDINALITY, PROP_COLLECTION_CLASS, PROP_DELETE_ACTION, PROP_ELEMENT_CLASS, PROP_FIELDS, PROP_GROUPS, PROP_IDENTITY, PROP_INVERSE_FIELD, PROP_KEY_CLASS, PROP_KEY_FIELD, PROP_MODIFIED, PROP_NAME, PROP_PERSISTENCE, PROP_PREFETCH, PROP_SENSITIVITY, PROP_UPDATE_ACTION

Constructor Summary

Constructors

Constructor and Description
RelationshipElement() Create new RelationshipElement with no implementation.
RelationshipElement(RelationshipElement.Impl impl, PersistenceClassElement declaringClass) Create new RelationshipElement with the provided implementation.

Method Summary

Modifier and Type	Method and Description
void	changeInverseRelationship(RelationshipElement inverseRelationship) Changes the inverse relationship element for this relationship element.
String	getCollectionClass() Get the collection class (for example Set, List, Vector, etc.) for this relationship element.
int	getDeleteAction() Get the delete action for this relationship element.
String	getElementClass() Get the element class for this relationship element.
RelationshipElement	getInverseRelationship(Model model) Get the inverse relationship element for this relationship element.
String	getInverseRelationshipName() Get the relative name of the inverse relationship field for this relationship element.
int	getLowerBound() Get the lower cardinality bound for this relationship element.
int	getUpdateAction() Get the update action for this relationship element.
int	getUpperBound() Get the upper cardinality bound for this relationship element.
boolean	isPrefetch() Determines whether this relationship element should prefetch or not.
void	setCollectionClass(String collectionClass) Set the collection class for this relationship element.
void	setDeleteAction(int action) Set the delete action for this relationship element.
void	setElementClass(String elementClass) Set the element class for this relationship element.
void	setInverseRelationship(RelationshipElement inverseRelationship, Model model) Set the inverse relationship element for this relationship element.
void	setLowerBound(int lowerBound) Set the lower cardinality bound for this relationship element.
void	setPrefetch(boolean flag) Set whether this relationship element should prefetch or not.
void	setUpdateAction(int action) Set the update action for this relationship element.
void	setUpperBound(int upperBound) Set the upper cardinality bound for this relationship element.

Methods inherited from class com.sun.jdo.api.persistence.model.jdo.PersistenceFieldElement

getConcurrencyGroups, getFieldNumber, getPersistenceType, isKey, isReadSensitive, isWriteSensitive, setKey, setPersistenceType, setReadSensitive, setWriteSensitive

Methods inherited from class com.sun.jdo.api.persistence.model.jdo.PersistenceMemberElement

equals, getDeclaringClass, hashCode, setDeclaringClass

Methods inherited from class com.sun.jdo.api.persistence.model.jdo.PersistenceElement

addPropertyChangeListener, addVetoableChangeListener, compareTo, getImpl, getMessages, getName, removePropertyChangeListener, removeVetoableChangeListener, setImpl, setName, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

NONE_ACTION

public static final int NONE_ACTION

Constant representing no action.

See Also:

Constant Field Values

NULLIFY_ACTION

public static final int NULLIFY_ACTION

Constant representing nullify action.

See Also:

Constant Field Values

RESTRICT_ACTION

public static final int RESTRICT_ACTION

Constant representing restrict action.

See Also:

Constant Field Values

CASCADE_ACTION

public static final int CASCADE_ACTION

Constant representing cascade action.

See Also:

Constant Field Values

AGGREGATE_ACTION

public static final int AGGREGATE_ACTION

Constant representing aggregate action.

See Also:

Constant Field Values

Constructor Detail

RelationshipElement

public RelationshipElement()

Create new RelationshipElement with no implementation. This constructor should only be used for cloning and archiving.

RelationshipElement

public RelationshipElement(RelationshipElement.Impl impl,
                           PersistenceClassElement declaringClass)

Create new RelationshipElement with the provided implementation. The implementation is responsible for storing all properties of the object.

Parameters:

impl - the implementation to use

declaringClass - the class to attach to

Method Detail

getUpdateAction

public int getUpdateAction()

Get the update action for this relationship element.

Returns:

the update action, one of NONE_ACTION, NULLIFY_ACTION, RESTRICT_ACTION, CASCADE_ACTION, or AGGREGATE_ACTION

setUpdateAction

public void setUpdateAction(int action)
                     throws ModelException

Set the update action for this relationship element.

Parameters:

action - - an integer indicating the update action, one of: NONE_ACTION, NULLIFY_ACTION, RESTRICT_ACTION, CASCADE_ACTION, or AGGREGATE_ACTION

Throws:

ModelException - if impossible

getDeleteAction

public int getDeleteAction()

Get the delete action for this relationship element.

Returns:

the delete action, one of NONE_ACTION, NULLIFY_ACTION, RESTRICT_ACTION, CASCADE_ACTION, or AGGREGATE_ACTION

setDeleteAction

public void setDeleteAction(int action)
                     throws ModelException

Set the delete action for this relationship element.

Parameters:

action - - an integer indicating the delete action, one of: NONE_ACTION, NULLIFY_ACTION, RESTRICT_ACTION, CASCADE_ACTION, or AGGREGATE_ACTION

Throws:

ModelException - if impossible

isPrefetch

public boolean isPrefetch()

Determines whether this relationship element should prefetch or not.

Returns:

true if the relationship should prefetch, false otherwise

setPrefetch

public void setPrefetch(boolean flag)
                 throws ModelException

Set whether this relationship element should prefetch or not.

Parameters:

flag - - if true, the relationship is set to prefetch; otherwise, it is not

Throws:

ModelException - if impossible

getLowerBound

public int getLowerBound()

Get the lower cardinality bound for this relationship element.

Returns:

the lower cardinality bound

setLowerBound

public void setLowerBound(int lowerBound)
                   throws ModelException

Set the lower cardinality bound for this relationship element.

Parameters:

lowerBound - - an integer indicating the lower cardinality bound

Throws:

ModelException - if impossible

getUpperBound

public int getUpperBound()

Get the upper cardinality bound for this relationship element. Returns Integer.MAX_VALUE for n

Returns:

the upper cardinality bound

setUpperBound

public void setUpperBound(int upperBound)
                   throws ModelException

Set the upper cardinality bound for this relationship element.

Parameters:

upperBound - - an integer indicating the upper cardinality bound (use Integer.MAX_VALUE for n)

Throws:

ModelException - if impossible

getCollectionClass

public String getCollectionClass()

Get the collection class (for example Set, List, Vector, etc.) for this relationship element.

Returns:

the collection class

setCollectionClass

public void setCollectionClass(String collectionClass)
                        throws ModelException

Set the collection class for this relationship element.

Parameters:

collectionClass - - a string indicating the type of collection (for example Set, List, Vector, etc.)

Throws:

ModelException - if impossible

getElementClass

public String getElementClass()

Get the element class for this relationship element. If primitive types are supported, you can use wrapperclass.TYPE.toString() to specify them.

Returns:

the element class

setElementClass

public void setElementClass(String elementClass)
                     throws ModelException

Set the element class for this relationship element.

Parameters:

elementClass - - a string indicating the type of elements in the collection. If primitive types are supported, you can use wrapperclass.TYPE.toString() to specify them.

Throws:

ModelException - if impossible

getInverseRelationshipName

public String getInverseRelationshipName()

Get the relative name of the inverse relationship field for this relationship element. In the case of two-way relationships, the two relationship elements involved are inverses of each other. If this relationship element does not participate in a two-way relationship, this returns null. Note that it is possible to have this method return a value, but because of the combination of related class and lookup, there may be no corresponding RelationshipElement which can be found.

Returns:

the relative name of the inverse relationship element

See Also:

getInverseRelationship(com.sun.jdo.api.persistence.model.Model)

getInverseRelationship

public RelationshipElement getInverseRelationship(Model model)

Get the inverse relationship element for this relationship element. In the case of two-way relationships, the two relationship elements involved are inverses of each other. If this relationship element does not participate in a two-way relationship, this returns null. Note that it is also possible for this method to return null even if getInverseRelationshipName() returns a value because the corresponding RelationshipElement cannot be found using the combination of related class and lookup (model).

Parameters:

model - the model object to be used to look it up

Returns:

the inverse relationship element if it exists

See Also:

getInverseRelationshipName()

setInverseRelationship

public void setInverseRelationship(RelationshipElement inverseRelationship,
                                   Model model)
                            throws ModelException

Set the inverse relationship element for this relationship element. In the case of two-way relationships, the two relationship elements involved are inverses of each other.

Parameters:

inverseRelationship - - a relationship element to be used as the inverse for this relationship element or null if this relationship element does not participate in a two-way relationship.

model - the model object to be used to look up the old inverse so it can be unset

Throws:

ModelException - if impossible

changeInverseRelationship

public void changeInverseRelationship(RelationshipElement inverseRelationship)
                               throws ModelException

Changes the inverse relationship element for this relationship element. This method is invoked for both sides from setInverseRelationship(com.sun.jdo.api.persistence.model.jdo.RelationshipElement, com.sun.jdo.api.persistence.model.Model) and should handle the vetoable change events, property change events, and setting the internal variable.

Parameters:

inverseRelationship - - a relationship element to be used as the inverse for this relationship element or null if this relationship element does not participate in a two-way relationship.

Throws:

ModelException - if impossible