org.cloudgraph.state

Class BindingSequenceGenerator

java.lang.Object

org.cloudgraph.state.BindingSequenceGenerator

All Implemented Interfaces:

SequenceGenerator

public class BindingSequenceGenerator
extends Object
implements SequenceGenerator

Stores sequence generator state information for a graph row using JAXB data binding and validation.

Every property of every entity regardless of whether it is part of a collection must contain a sequence number that is unique for the entity type within the local graph row. This is essential as a single graph may contain multiple collections of the same entity type. The current sequence number for each entity type is maintained as state information for the graph row. This is minimal and consists of a simple mapping of type physical names, mapped to long integers. At runtime this state information is used within a sequence generator, with changes being written back to the graph row on commit.

Since:

0.5

Author:

Scott Cinnamond

See Also:

StateModel, URI, TypeEntry

Field Summary

Fields

Modifier and Type	Field and Description
static Charset	charset

Constructor Summary

Constructors

Constructor and Description
BindingSequenceGenerator(StateMarshalingContext context)
BindingSequenceGenerator(String state, StateMarshalingContext context)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	hasLastSequence(org.plasma.sdo.PlasmaType type)
boolean	isUpdated()
Long	lastSequence(org.plasma.sdo.PlasmaType type)
byte[]	marshal()
String	marshalAsString()
String	marshalAsString(boolean formatted)
Long	nextSequence(commonj.sdo.DataObject dataObject) Creates and adds a sequence number mapped to the UUID within the given data object.
Long	nextSequence(org.plasma.sdo.PlasmaType type)

Methods inherited from class java.lang.Object

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

Field Detail

charset

public static final Charset charset

Constructor Detail

BindingSequenceGenerator

public BindingSequenceGenerator(StateMarshalingContext context)

BindingSequenceGenerator

public BindingSequenceGenerator(String state,
                                StateMarshalingContext context)

Method Detail

close

public void close()

Specified by:

close in interface SequenceGenerator

hasLastSequence

public boolean hasLastSequence(org.plasma.sdo.PlasmaType type)

Specified by:

hasLastSequence in interface SequenceGenerator

lastSequence

public Long lastSequence(org.plasma.sdo.PlasmaType type)

Specified by:

lastSequence in interface SequenceGenerator

nextSequence

public Long nextSequence(commonj.sdo.DataObject dataObject)

Description copied from interface: SequenceGenerator

Creates and adds a sequence number mapped to the UUID within the given data object.

Specified by:

nextSequence in interface SequenceGenerator

Parameters:

dataObject - the data object

Returns:

the new sequence number

nextSequence

public Long nextSequence(org.plasma.sdo.PlasmaType type)

Specified by:

nextSequence in interface SequenceGenerator

marshalAsString

public String marshalAsString()

Specified by:

marshalAsString in interface SequenceGenerator

marshal

public byte[] marshal()

Specified by:

marshal in interface SequenceGenerator

marshalAsString

public String marshalAsString(boolean formatted)

Specified by:

marshalAsString in interface SequenceGenerator

isUpdated

public boolean isUpdated()

Specified by:

isUpdated in interface SequenceGenerator