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

Class JDOClassImplCaching

java.lang.Object

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

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

org.apache.jdo.impl.model.jdo.JDOClassImplDynamic

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

All Implemented Interfaces:

java.lang.Comparable, JDOClass, JDOElement, JDOMember

public class JDOClassImplCaching
extends JDOClassImplDynamic

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

Since:

1.1

Version:

1.1

Author:

Michael Bouschen

Field Summary

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

identityType, javaType, msg, objectIdClass, pcSuperclass

Constructor Summary

Constructors

Constructor and Description
JDOClassImplCaching()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	calculateFieldNumbers() This method calculates the relative field number of the declared managed fields of this JDOClass and uddates the relativeFieldNumber property of the JDOField instance.
JDOField	createJDOField(java.lang.String name) This method returns a JDOField instance for the field with the specified name.
JDOField[]	getDeclaredManagedFields() Returns the collection of managed JDOField instances declared by this JDOClass in the form of an array.
JDOField[]	getDefaultFetchGroupFields() Returns the collection of default fetch group fields of this JDOClass in the form of an array.
int	getIdentityType() Get the JDO identity type of this JDOClass.
int	getInheritedManagedFieldCount() Returns the number of inherited managed fields for this class.
JavaType	getJavaType() Provides the JavaType representaion corresponding to this JDOClass.
int[]	getManagedFieldNumbers() Returns an array of absolute field numbers of the managed fields of this JDOClass.
JDOField[]	getManagedFields() Returns the collection of managed JDOField instances of this JDOClass in the form of an array.
JavaType	getObjectIdClass() Get the JavaType representation of the object identity class (primary key class) for this JDOClass.
JDOClass	getPersistenceCapableSuperclass() Returns the JDOClass instance for the persistence-capable superclass of this JDOClass.
int[]	getPersistentFieldNumbers() Returns an array of absolute field numbers of the persistent fields of this JDOClass.
JDOField[]	getPersistentFields() Returns the collection of persistent JDOField instances of this JDOClass in the form of an array.
int[]	getPersistentNonPrimaryKeyFieldNumbers() Returns an array of absolute field numbers of the non identifying, persistent fields of this JDOClass.
int[]	getPersistentRelationshipFieldNumbers() Returns an array of absolute field numbers of persistent relationship fields of this JDOClass.
JDOField[]	getPersistentRelationshipFields() Returns the collection of persistent relationship fields of this JDOClass in the form of an array.
int[]	getPersistentSerializableFieldNumbers() Returns an array of absolute field numbers of persistent, serializable fields of this JDOClass.
int[]	getPrimaryKeyFieldNumbers() Returns an array of absolute field numbers of the identifying fields of this JDOClass.
JDOField[]	getPrimaryKeyFields() Returns the collection of identifying fields of this JDOClass in the form of an array.
protected JDOClass	newJDOClassInstance() Returns a new instance of the JDOClass implementation class.
protected JDOField	newJDOFieldInstance() Returns a new instance of the JDOField implementation class.
void	removeDeclaredMember(JDOMember member) Remove the supplied member from the collection of members maintained by this JDOClass.

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

createJDOClass, getDeclaredClasses, getDeclaredField, getDeclaredFields, getDeclaredManagedFieldCount, getDeclaredMembers, getDeclaredObjectIdClassName, getDeclaringModel, getField, getField, getFieldInternal, getJDOPackage, getManagedField, getManagedFieldCount, getPackagePrefix, getPersistenceCapableRootClass, getPersistenceCapableSuperclassName, isXMLMetadataLoaded, requiresExtent, setDeclaredObjectIdClassName, setDeclaringModel, setIdentityType, setJavaType, setJDOPackage, setObjectIdClass, setPersistenceCapableSuperclass, setPersistenceCapableSuperclassName, setRequiresExtent, setXMLMetadataLoaded

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

JDOClassImplCaching

public JDOClassImplCaching()

Method Detail

getIdentityType

public int getIdentityType()

Get the JDO identity type of this JDOClass. The identity type of the least-derived persistence-capable class defines the identity type for all persistence-capable classes that extend it. The identity type of the least-derived persistence-capable class is defaulted to JDOIdentityType.APPLICATION if objectid-class is specified, and JDOIdentityType.DATASTORE, if not.

Specified by:

getIdentityType in interface JDOClass

Overrides:

getIdentityType in class JDOClassImplDynamic

Returns:

the JDO identity type, one of JDOIdentityType.APPLICATION, JDOIdentityType.DATASTORE, or JDOIdentityType.NONDURABLE

getObjectIdClass

public JavaType getObjectIdClass()

Get the JavaType representation of the object identity class (primary key class) for this JDOClass.

Specified by:

getObjectIdClass in interface JDOClass

Overrides:

getObjectIdClass in class JDOClassImplDynamic

Returns:

the JavaType representation of the object identity class.

getPersistenceCapableSuperclass

public JDOClass getPersistenceCapableSuperclass()

Returns the JDOClass instance for the persistence-capable superclass of this JDOClass. If this class does not have a persistence-capable superclass then null is returned.

Specified by:

getPersistenceCapableSuperclass in interface JDOClass

Overrides:

getPersistenceCapableSuperclass in class JDOClassImplDynamic

Returns:

the JDClass instance of the persistence-capable superclass or null if there is no persistence-capable superclass

getJavaType

public JavaType getJavaType()

Provides the JavaType representaion corresponding to this JDOClass.

Note the difference between Object.getClass() and this method. The former returns the class of the object in hand, this returns the class of the object represented by this meta data.

Specified by:

getJavaType in interface JDOClass

Overrides:

getJavaType in class JDOClassImplDynamic

Returns:

the JavaType object corresponding to this JDOClass.

removeDeclaredMember

public void removeDeclaredMember(JDOMember member)
                          throws ModelException

Remove the supplied member from the collection of members maintained by this JDOClass.

Specified by:

removeDeclaredMember in interface JDOClass

Overrides:

removeDeclaredMember in class JDOClassImplDynamic

Parameters:

member - the member to be removed

Throws:

ModelException - if impossible

createJDOField

public JDOField createJDOField(java.lang.String name)
                        throws ModelException

This method returns a JDOField instance for the field with the specified name. If this JDOClass already declares such a field, the existing JDOField instance is returned. Otherwise, it creates a new JDOField instance, sets its declaringClass and returns the new instance.

Note, if the field numbers for the managed fields of this JDOClass are calculated, this methid will fail to create a new JDOField. Any new field would possibly invalidate existing field number

Specified by:

createJDOField in interface JDOClass

Overrides:

createJDOField in class JDOClassImplDynamic

Parameters:

name - the name of the field

Throws:

ModelException - if impossible

getDeclaredManagedFields

public JDOField[] getDeclaredManagedFields()

Returns the collection of managed JDOField instances declared by this JDOClass in the form of an array. The returned array does not include inherited fields. A field is a managed field, if it has the persistence-modifier PersistenceModifier.PERSISTENT or PersistenceModifier.TRANSACTIONAL. The position of the fields in the returned array equals their relative field number as returned by JDOField.getRelativeFieldNumber(). The following holds true for any field in the returned array:

• getDeclaredManagedFields()[i].getRelativeFieldNumber() == i
• getDeclaredManagedFields()[field.getRelativeFieldNumber()] == field

Specified by:

getDeclaredManagedFields in interface JDOClass

Overrides:

getDeclaredManagedFields in class JDOClassImplDynamic

Returns:

the managed fields declared by this JDOClass

getManagedFields

public JDOField[] getManagedFields()

Returns the collection of managed JDOField instances of this JDOClass in the form of an array. The returned array includes inherited fields. A field is a managed field, if it has the persistence-modifier PersistenceModifier.PERSISTENT or PersistenceModifier.TRANSACTIONAL. The position of the fields in the returned array equals their absolute field number as returned by JDOField.getFieldNumber(). The following holds true for any field in the returned array:

• getManagedFields()[i].getFieldNumber() == i
• getManagedFields()[field.getFieldNumber()] == field

Specified by:

getManagedFields in interface JDOClass

Overrides:

getManagedFields in class JDOClassImplDynamic

Returns:

the managed fields of this JDOClass

getPersistentFields

public JDOField[] getPersistentFields()

Returns the collection of persistent JDOField instances of this JDOClass in the form of an array. The returned array includes inherited fields. A field is a persistent field, if it has the persistence-modifier PersistenceModifier.PERSISTENT. Please note, the position of the fields in the returned array might not equal their absolute field number as returned by JDOField.getFieldNumber().

Specified by:

getPersistentFields in interface JDOClass

Overrides:

getPersistentFields in class JDOClassImplDynamic

Returns:

the persistent fields of this JDOClass

getPrimaryKeyFields

public JDOField[] getPrimaryKeyFields()

Returns the collection of identifying fields of this JDOClass in the form of an array. The method returns the JDOField instances defined as primary key fields (see JDOField.isPrimaryKey()).

Specified by:

getPrimaryKeyFields in interface JDOClass

Overrides:

getPrimaryKeyFields in class JDOClassImplDynamic

Returns:

the identifying fields of this JDOClass

getPersistentRelationshipFields

public JDOField[] getPersistentRelationshipFields()

Returns the collection of persistent relationship fields of this JDOClass in the form of an array. The method returns the JDOField instances defined as relationship (method JDOField.getRelationship() returns a non null value) and having the persistence-modifier PersistenceModifier.PERSISTENT.

Specified by:

getPersistentRelationshipFields in interface JDOClass

Overrides:

getPersistentRelationshipFields in class JDOClassImplDynamic

Returns:

the persistent relationship fields of this JDOClass

getDefaultFetchGroupFields

public JDOField[] getDefaultFetchGroupFields()

Returns the collection of default fetch group fields of this JDOClass in the form of an array. The method returns the JDOField instances defined as part of the default fetch group (method JDOField.isDefaultFetchGroup() returns true.

Specified by:

getDefaultFetchGroupFields in interface JDOClass

Overrides:

getDefaultFetchGroupFields in class JDOClassImplDynamic

Returns:

the default fetch group fields of this JDOClass

Since:

1.1

getManagedFieldNumbers

public int[] getManagedFieldNumbers()

Returns an array of absolute field numbers of the managed fields of this JDOClass. The returned array includes field numbers of inherited fields. A field is a managed field, if it has the persistence-modifier PersistenceModifier.PERSISTENT or PersistenceModifier.TRANSACTIONAL. Only managed fields have a valid field number, thus the field number in the returned array equals its index:
getManagedFields()[i] == i

Specified by:

getManagedFieldNumbers in interface JDOClass

Overrides:

getManagedFieldNumbers in class JDOClassImplDynamic

getPersistentFieldNumbers

public int[] getPersistentFieldNumbers()

Returns an array of absolute field numbers of the persistent fields of this JDOClass. The returned array includes field numbers of inherited fields. A persistent field has the persistence-modifier PersistenceModifier.PERSISTENT.

Specified by:

getPersistentFieldNumbers in interface JDOClass

Overrides:

getPersistentFieldNumbers in class JDOClassImplDynamic

getPrimaryKeyFieldNumbers

public int[] getPrimaryKeyFieldNumbers()

Returns an array of absolute field numbers of the identifying fields of this JDOClass. A field number is included in the returned array, iff the corresponding JDOField instance is defined as primary key field (see JDOField.isPrimaryKey()).

Specified by:

getPrimaryKeyFieldNumbers in interface JDOClass

Overrides:

getPrimaryKeyFieldNumbers in class JDOClassImplDynamic

Returns:

array of numbers of the identifying fields

getPersistentNonPrimaryKeyFieldNumbers

public int[] getPersistentNonPrimaryKeyFieldNumbers()

Returns an array of absolute field numbers of the non identifying, persistent fields of this JDOClass. A field number is included in the returned array, iff the corresponding JDOField instance is persistent and not a not a primary key field (see JDOField.isPrimaryKey()). A field is a persistent field, if it has the persistence-modifier PersistenceModifier.PERSISTENT or (see JDOField.getPersistenceModifier()).

Specified by:

getPersistentNonPrimaryKeyFieldNumbers in interface JDOClass

Overrides:

getPersistentNonPrimaryKeyFieldNumbers in class JDOClassImplDynamic

Returns:

array of numbers of the non identifying, persistent fields

getPersistentRelationshipFieldNumbers

public int[] getPersistentRelationshipFieldNumbers()

Returns an array of absolute field numbers of persistent relationship fields of this JDOClass. A field number is included in the returned array, iff the corresponding JDOField instance is a relationship (method JDOField.getRelationship() returns a non null value) and has the persistence-modifier PersistenceModifier.PERSISTENT.

Specified by:

getPersistentRelationshipFieldNumbers in interface JDOClass

Overrides:

getPersistentRelationshipFieldNumbers in class JDOClassImplDynamic

Returns:

the field numbers of the persistent relationship fields

getPersistentSerializableFieldNumbers

public int[] getPersistentSerializableFieldNumbers()

Returns an array of absolute field numbers of persistent, serializable fields of this JDOClass. A field number is included in the returned array, iff the corresponding JDOField instance is serializable (method JDOField.isSerializable() returns true) and has the persistence-modifier PersistenceModifier.PERSISTENT.

Specified by:

getPersistentSerializableFieldNumbers in interface JDOClass

Overrides:

getPersistentSerializableFieldNumbers in class JDOClassImplDynamic

Returns:

the field numbers of serializable fields

getInheritedManagedFieldCount

public int getInheritedManagedFieldCount()

Returns the number of inherited managed fields for this class.

Specified by:

getInheritedManagedFieldCount in interface JDOClass

Overrides:

getInheritedManagedFieldCount in class JDOClassImplDynamic

Returns:

number of inherited fields

calculateFieldNumbers

protected void calculateFieldNumbers()

This method calculates the relative field number of the declared managed fields of this JDOClass and uddates the relativeFieldNumber property of the JDOField instance.

newJDOClassInstance

protected JDOClass newJDOClassInstance()

Returns a new instance of the JDOClass implementation class.

Overrides:

newJDOClassInstance in class JDOClassImplDynamic

newJDOFieldInstance

protected JDOField newJDOFieldInstance()

Returns a new instance of the JDOField implementation class.

Overrides:

newJDOFieldInstance in class JDOClassImplDynamic