org.datanucleus.store

Class NucleusSequenceImpl

java.lang.Object

org.datanucleus.store.NucleusSequenceImpl

All Implemented Interfaces:

NucleusSequence

public class NucleusSequenceImpl
extends Object
implements NucleusSequence

Basic generic implementation of a datastore sequence. Utilises the "org.datanucleus.store_valuegenerator" extensions.

Field Summary

Fields

Modifier and Type	Field and Description
protected ExecutionContext	ec execution context.
protected ValueGenerator	generator The generator for the sequence.
protected SequenceMetaData	seqMetaData Name of the sequence.
protected StoreManager	storeManager Store Manager where we obtain our sequence.

Constructor Summary

Constructors

Constructor and Description
NucleusSequenceImpl(ExecutionContext objectMgr, StoreManager storeMgr, SequenceMetaData seqmd) Constructor.

Method Summary

Modifier and Type	Method and Description
void	allocate(int additional) Method to allocate a set of elements.
Object	current() Accessor for the current element.
long	currentValue() Accessor for the current element in the sequence as a long.
String	getName() Accessor for the sequence name.
Object	next() Accessor for the next element in the sequence.
long	nextValue() Accessor for the next element in the sequence as a long.
protected void	setGenerator() Method to set the value generator to use.

Methods inherited from class java.lang.Object

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

Field Detail

storeManager

protected final StoreManager storeManager

Store Manager where we obtain our sequence.

seqMetaData

protected final SequenceMetaData seqMetaData

Name of the sequence.

generator

protected ValueGenerator generator

The generator for the sequence.

ec

protected final ExecutionContext ec

execution context.

Constructor Detail

NucleusSequenceImpl

public NucleusSequenceImpl(ExecutionContext objectMgr,
                           StoreManager storeMgr,
                           SequenceMetaData seqmd)

Constructor.

Parameters:

objectMgr - The ExecutionContext managing the sequence

storeMgr - Manager of the store where we obtain the sequence

seqmd - MetaData defining the sequence

Method Detail

setGenerator

protected void setGenerator()

Method to set the value generator to use.

getName

public String getName()

Accessor for the sequence name.

Specified by:

getName in interface NucleusSequence

Returns:

The sequence name

allocate

public void allocate(int additional)

Method to allocate a set of elements.

Specified by:

allocate in interface NucleusSequence

Parameters:

additional - The number of additional elements to allocate

next

public Object next()

Accessor for the next element in the sequence.

Specified by:

next in interface NucleusSequence

Returns:

The next element

nextValue

public long nextValue()

Accessor for the next element in the sequence as a long.

Specified by:

nextValue in interface NucleusSequence

Returns:

The next element

current

public Object current()

Accessor for the current element.

Specified by:

current in interface NucleusSequence

Returns:

The current element.

currentValue

public long currentValue()

Accessor for the current element in the sequence as a long.

Specified by:

currentValue in interface NucleusSequence

Returns:

The current element