com.db4o.internal.handlers

Class NullFieldAwareTypeHandler

java.lang.Object

com.db4o.internal.handlers.NullFieldAwareTypeHandler

All Implemented Interfaces:

DeepClone, FieldAwareTypeHandler, VirtualAttributeHandler, VersionedTypeHandler, CascadingTypeHandler, ReferenceTypeHandler, TypeHandler4

public class NullFieldAwareTypeHandler
extends java.lang.Object
implements FieldAwareTypeHandler

Field Summary

Fields

Modifier and Type	Field and Description
static FieldAwareTypeHandler	INSTANCE

Constructor Summary

Constructors

Constructor and Description
NullFieldAwareTypeHandler()

Method Summary

Methods

Modifier and Type	Method and Description
void	activate(ReferenceActivationContext context) gets called when an object is to be activated.
void	addFieldIndices(ObjectIdContextImpl context)
void	cascadeActivation(ActivationContext context) will be called during activation if the handled object is already active
void	classMetadata(ClassMetadata classMetadata)
void	collectIDs(CollectIdContext context, Predicate4<ClassAspect> predicate)
void	collectIDs(QueryingReadContext context) will be called during querying to ask for IDs of member objects of the handled object.
java.lang.Object	deepClone(java.lang.Object context) The parameter allows passing one new object so parent references can be corrected on children.
void	defragment(DefragmentContext context) gets called when an object gets defragmented.
void	delete(DeleteContext context) gets called when an object gets deleted.
void	deleteMembers(DeleteContextImpl deleteContext, boolean isUpdate)
PreparedComparison	prepareComparison(Context context, java.lang.Object obj)
TypeHandler4	readCandidateHandler(QueryingReadContext context) will be called during querying to ask for the handler to be used to collect children of the handled object
void	readVirtualAttributes(ObjectReferenceContext context)
boolean	seekToField(ObjectHeaderContext context, ClassAspect aspect)
TypeHandler4	unversionedTemplate()
void	write(WriteContext context, java.lang.Object obj) gets called when an object is to be written to the database.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final FieldAwareTypeHandler INSTANCE

Constructor Detail

NullFieldAwareTypeHandler

public NullFieldAwareTypeHandler()

Method Detail

addFieldIndices

public void addFieldIndices(ObjectIdContextImpl context)

Specified by:

addFieldIndices in interface FieldAwareTypeHandler

classMetadata

public void classMetadata(ClassMetadata classMetadata)

Specified by:

classMetadata in interface FieldAwareTypeHandler

collectIDs

public void collectIDs(CollectIdContext context,
              Predicate4<ClassAspect> predicate)

Specified by:

collectIDs in interface FieldAwareTypeHandler

deleteMembers

public void deleteMembers(DeleteContextImpl deleteContext,
                 boolean isUpdate)

Specified by:

deleteMembers in interface FieldAwareTypeHandler

readVirtualAttributes

public void readVirtualAttributes(ObjectReferenceContext context)

Specified by:

readVirtualAttributes in interface FieldAwareTypeHandler

Specified by:

readVirtualAttributes in interface VirtualAttributeHandler

seekToField

public boolean seekToField(ObjectHeaderContext context,
                  ClassAspect aspect)

Specified by:

seekToField in interface FieldAwareTypeHandler

defragment

public void defragment(DefragmentContext context)

Description copied from interface: TypeHandler4

gets called when an object gets defragmented.

Specified by:

defragment in interface TypeHandler4

delete

public void delete(DeleteContext context)
            throws Db4oIOException

Description copied from interface: TypeHandler4

gets called when an object gets deleted.

Specified by:

delete in interface TypeHandler4

Throws:

Db4oIOException

activate

public void activate(ReferenceActivationContext context)

Description copied from interface: ReferenceTypeHandler

gets called when an object is to be activated.

Specified by:

activate in interface ReferenceTypeHandler

write

public void write(WriteContext context,
         java.lang.Object obj)

Description copied from interface: TypeHandler4

gets called when an object is to be written to the database.

Specified by:

write in interface TypeHandler4

obj - the object

prepareComparison

public PreparedComparison prepareComparison(Context context,
                                   java.lang.Object obj)

unversionedTemplate

public TypeHandler4 unversionedTemplate()

Specified by:

unversionedTemplate in interface VersionedTypeHandler

deepClone

public java.lang.Object deepClone(java.lang.Object context)

Description copied from interface: DeepClone

The parameter allows passing one new object so parent references can be corrected on children.

Specified by:

deepClone in interface DeepClone

cascadeActivation

public void cascadeActivation(ActivationContext context)

Description copied from interface: CascadingTypeHandler

will be called during activation if the handled object is already active

Specified by:

cascadeActivation in interface CascadingTypeHandler

collectIDs

public void collectIDs(QueryingReadContext context)

Description copied from interface: CascadingTypeHandler

will be called during querying to ask for IDs of member objects of the handled object.

Specified by:

collectIDs in interface CascadingTypeHandler

readCandidateHandler

public TypeHandler4 readCandidateHandler(QueryingReadContext context)

Description copied from interface: CascadingTypeHandler

will be called during querying to ask for the handler to be used to collect children of the handled object

Specified by:

readCandidateHandler in interface CascadingTypeHandler

Returns: