Package com.db4o.internal

Class OpenTypeHandler

java.lang.Object

com.db4o.internal.OpenTypeHandler

All Implemented Interfaces:

BuiltinTypeHandler, LinkLengthAware, CascadingTypeHandler, ReferenceTypeHandler, TypeHandler4, ValueTypeHandler

Direct Known Subclasses:

InterfaceTypeHandler, OpenTypeHandler7

public class OpenTypeHandler
extends java.lang.Object
implements ReferenceTypeHandler, ValueTypeHandler, BuiltinTypeHandler, CascadingTypeHandler, LinkLengthAware

Constructor Summary

Constructors

Constructor	Description
OpenTypeHandler(ObjectContainerBase container)

Method Summary

Modifier and Type	Method	Description
void	activate(ReferenceActivationContext context)	gets called when an object is to be activated.
void	cascadeActivation(ActivationContext context)	will be called during activation if the handled object is already active
ReflectClass	classReflector()
void	collectIDs(QueryingReadContext readContext)	will be called during querying to ask for IDs of member objects of the handled object.
protected ObjectContainerBase	container(DefragmentContext context)
protected TypeHandler4	correctTypeHandlerVersionFor(DefragmentContext context, int classMetadataId)
void	defragment(DefragmentContext context)	gets called when an object gets defragmented.
void	delete(DeleteContext context)	gets called when an object gets deleted.
boolean	equals(java.lang.Object obj)
int	getID()
boolean	hasField(ObjectContainerBase a_stream, java.lang.String a_path)
int	hashCode()
static boolean	isPlainObject(TypeHandler4 typeHandler)
int	linkLength()
java.lang.Object	read(ReadContext readContext)	gets called when an value type is to be read from the database.
TypeHandler4	readCandidateHandler(QueryingReadContext context)	will be called during querying to ask for the handler to be used to collect children of the handled object
ObjectID	readObjectID(InternalReadContext context)
protected TypeHandler4	readTypeHandler(InternalReadContext context, int payloadOffset)
TypeHandler4	readTypeHandlerRestoreOffset(InternalReadContext context)
void	registerReflector(Reflector reflector)
protected void	seekSecondaryOffset(ReadBuffer buffer, TypeHandler4 typeHandler)
TypeHandler4	typeHandlerForObject(java.lang.Object obj)
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, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OpenTypeHandler

public OpenTypeHandler(ObjectContainerBase container)

Method Detail

classReflector

public ReflectClass classReflector()

Specified by:

classReflector in interface BuiltinTypeHandler

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

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

getID

public int getID()

hasField

public boolean hasField(ObjectContainerBase a_stream,
                        java.lang.String a_path)

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:

readObjectID

public ObjectID readObjectID(InternalReadContext context)

defragment

public void defragment(DefragmentContext context)

Description copied from interface: TypeHandler4

gets called when an object gets defragmented.

Specified by:

defragment in interface TypeHandler4

correctTypeHandlerVersionFor

protected TypeHandler4 correctTypeHandlerVersionFor(DefragmentContext context,
                                                    int classMetadataId)

container

protected ObjectContainerBase container(DefragmentContext context)

readTypeHandler

protected TypeHandler4 readTypeHandler(InternalReadContext context,
                                       int payloadOffset)

seekSecondaryOffset

protected void seekSecondaryOffset(ReadBuffer buffer,
                                   TypeHandler4 typeHandler)

Parameters:

buffer -

typeHandler -

read

public java.lang.Object read(ReadContext readContext)

Description copied from interface: ValueTypeHandler

gets called when an value type is to be read from the database.

Specified by:

read in interface ValueTypeHandler

Returns:

the read value type

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

collectIDs

public void collectIDs(QueryingReadContext readContext)

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

readTypeHandlerRestoreOffset

public TypeHandler4 readTypeHandlerRestoreOffset(InternalReadContext context)

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

isPlainObject

public static boolean isPlainObject(TypeHandler4 typeHandler)

typeHandlerForObject

public TypeHandler4 typeHandlerForObject(java.lang.Object obj)

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

registerReflector

public void registerReflector(Reflector reflector)

Specified by:

registerReflector in interface BuiltinTypeHandler

linkLength

public int linkLength()

Specified by:

linkLength in interface LinkLengthAware