org.apache.jdo.impl.model.jdo.caching

Class JDOFieldImplCaching

java.lang.Object

org.apache.jdo.impl.model.jdo.JDOElementImpl

org.apache.jdo.impl.model.jdo.JDOMemberImpl

org.apache.jdo.impl.model.jdo.JDOFieldImplDynamic

org.apache.jdo.impl.model.jdo.caching.JDOFieldImplCaching

All Implemented Interfaces:

java.lang.Comparable, JDOElement, JDOField, JDOMember

public class JDOFieldImplCaching
extends JDOFieldImplDynamic

An instance of this class represents the JDO metadata of a managed field of a persistence capable class. This caching implementation caches any calulated value to avoid re-calculating it if it is requested again.

Please note, this implementation does not support changing the relationship property once it is defined (either explicitly by the setter or internally calculated by the getter). The second attempt to define the relationship will result in an exception.

Since:

1.1

Version:

1.1

Author:

Michael Bouschen

Field Summary

Fields inherited from class org.apache.jdo.impl.model.jdo.JDOFieldImplDynamic

defaultFetchGroup, embedded, msg, persistenceModifier, relationship

Constructor Summary

Constructors

Constructor and Description
JDOFieldImplCaching()

Method Summary

Methods

Modifier and Type	Method and Description
JDOArray	createJDOArray() Creates and returns a new JDOArray instance.
protected JDOArray	createJDOArrayInternal() Creates and returns a new JDOArray instance.
JDOCollection	createJDOCollection() Creates and returns a new JDOCollection instance.
protected JDOCollection	createJDOCollectionInternal() Creates and returns a new JDOCollection instance.
JDOMap	createJDOMap() Creates and returns a new JDOMap instance.
protected JDOMap	createJDOMapInternal() Creates and returns a new JDOMap instance.
JDOReference	createJDOReference() Creates and returns a new JDOReference instance.
int	getPersistenceModifier() Get the persistence modifier of this JDOField.
JDORelationship	getRelationship() Get the relationship information for this JDOField.
int	getRelativeFieldNumber() Returns the relative field number of this JDOField.
boolean	isDefaultFetchGroup() Determines whether this JDOField is part of the default fetch group or not.
boolean	isEmbedded() Determines whether the field should be stored if possible as part of the instance instead of as its own instance in the datastore.

Methods inherited from class org.apache.jdo.impl.model.jdo.JDOFieldImplDynamic

createJDOReferenceInternal, getFieldNumber, getJavaField, getNullValueTreatment, getType, isManaged, isPersistent, isPrimaryKey, isRelationship, isSerializable, isTransactional, setDefaultFetchGroup, setEmbedded, setJavaField, setNullValueTreatment, setPersistenceModifier, setPrimaryKey, setRelationship, setSerializable

Methods inherited from class org.apache.jdo.impl.model.jdo.JDOMemberImpl

compareTo, equals, getDeclaringClass, getName, hashCode, setDeclaringClass, setName, toString

Methods inherited from class org.apache.jdo.impl.model.jdo.JDOElementImpl

addPropertyChangeListener, addVetoableChangeListener, createJDOExtension, firePropertyChange, fireVetoableChange, getJDOExtensions, removeJDOExtension, removePropertyChangeListener, removeVetoableChangeListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jdo.model.jdo.JDOMember

getDeclaringClass, getName, setDeclaringClass, setName

Methods inherited from interface org.apache.jdo.model.jdo.JDOElement

addPropertyChangeListener, addVetoableChangeListener, createJDOExtension, getJDOExtensions, removeJDOExtension, removePropertyChangeListener, removeVetoableChangeListener

Methods inherited from interface java.lang.Comparable

compareTo

Constructor Detail

JDOFieldImplCaching

public JDOFieldImplCaching()

Method Detail

getPersistenceModifier

public int getPersistenceModifier()

Get the persistence modifier of this JDOField.

Specified by:

getPersistenceModifier in interface JDOField

Overrides:

getPersistenceModifier in class JDOFieldImplDynamic

Returns:

the persistence modifier, one of PersistenceModifier.NONE, PersistenceModifier.PERSISTENT, PersistenceModifier.TRANSACTIONAL, or PersistenceModifier.POSSIBLY_PERSISTENT.

getRelativeFieldNumber

public int getRelativeFieldNumber()

Returns the relative field number of this JDOField.

Specified by:

getRelativeFieldNumber in interface JDOField

Overrides:

getRelativeFieldNumber in class JDOFieldImplDynamic

Returns:

the relative field number

isDefaultFetchGroup

public boolean isDefaultFetchGroup()

Determines whether this JDOField is part of the default fetch group or not.

Specified by:

isDefaultFetchGroup in interface JDOField

Overrides:

isDefaultFetchGroup in class JDOFieldImplDynamic

Returns:

true if the field is part of the default fetch group, false otherwise

isEmbedded

public boolean isEmbedded()

Determines whether the field should be stored if possible as part of the instance instead of as its own instance in the datastore.

Specified by:

isEmbedded in interface JDOField

Overrides:

isEmbedded in class JDOFieldImplDynamic

Returns:

true if the field is stored as part of the instance; false otherwise

getRelationship

public JDORelationship getRelationship()

Get the relationship information for this JDOField. The method returns null if the field is not part of a relationship (e.g. it is a primitive type field).

Specified by:

getRelationship in interface JDOField

Overrides:

getRelationship in class JDOFieldImplDynamic

Returns:

relationship info of this JDOField or null if this JDOField is not a relationship

createJDOReference

public JDOReference createJDOReference()
                                throws ModelException

Creates and returns a new JDOReference instance. This method automatically binds the new JDOReference to this JDOField. It throws a ModelException, if this JDOField is already bound to another JDORelationship instance. Otherwise the following holds true:

• Method getRelationship() returns the new created instance
• this.getRelationship().getDeclaringField() == this

Specified by:

createJDOReference in interface JDOField

Overrides:

createJDOReference in class JDOFieldImplDynamic

Returns:

a new JDOReference instance bound to this JDOField

Throws:

ModelException - if impossible

createJDOCollection

public JDOCollection createJDOCollection()
                                  throws ModelException

Creates and returns a new JDOCollection instance. This method automatically binds the new JDOCollection to this JDOField. It throws a ModelException, if this JDOField is already bound to another JDORelationship instance. Otherwise the following holds true:

• Method getRelationship() returns the new created instance
• this.getRelationship().getDeclaringField() == this

Specified by:

createJDOCollection in interface JDOField

Overrides:

createJDOCollection in class JDOFieldImplDynamic

Returns:

a new JDOCollection instance bound to this JDOField

Throws:

ModelException - if impossible

createJDOArray

public JDOArray createJDOArray()
                        throws ModelException

Creates and returns a new JDOArray instance. This method automatically binds the new JDOArray to this JDOField. It throws a ModelException, if this JDOField is already bound to another JDORelationship instance. Otherwise the following holds true:

• Method getRelationship() returns the new created instance
• this.getRelationship().getDeclaringField() == this

Specified by:

createJDOArray in interface JDOField

Overrides:

createJDOArray in class JDOFieldImplDynamic

Returns:

a new JDOArray instance bound to this JDOField

Throws:

ModelException - if impossible

createJDOMap

public JDOMap createJDOMap()
                    throws ModelException

Creates and returns a new JDOMap instance. This method automatically binds the new JDOMap to this JDOField. It throws a ModelException, if this JDOField is already bound to another JDORelationship instance. Otherwise the following holds true:

• Method getRelationship() returns the new created instance
• this.getRelationship().getDeclaringField() == this

Specified by:

createJDOMap in interface JDOField

Overrides:

createJDOMap in class JDOFieldImplDynamic

Returns:

a new JDOMap instance bound to this JDOField

Throws:

ModelException - if impossible

createJDOCollectionInternal

protected JDOCollection createJDOCollectionInternal()

Creates and returns a new JDOCollection instance. This method automatically this JDOField as the declarinmg field of the returned instance.

Overrides:

createJDOCollectionInternal in class JDOFieldImplDynamic

Returns:

a new JDOCollection instance bound to this JDOField

createJDOArrayInternal

protected JDOArray createJDOArrayInternal()

Creates and returns a new JDOArray instance. This method automatically this JDOField as the declarinmg field of the returned instance.

Overrides:

createJDOArrayInternal in class JDOFieldImplDynamic

Returns:

a new JDOArray instance bound to this JDOField

createJDOMapInternal

protected JDOMap createJDOMapInternal()

Creates and returns a new JDOMap instance. This method automatically this JDOField as the declarinmg field of the returned instance.

Overrides:

createJDOMapInternal in class JDOFieldImplDynamic

Returns:

a new JDOMap instance bound to this JDOField