org.datanucleus.jdo
Class JDOSequenceImpl

java.lang.Object
  org.datanucleus.jdo.JDOSequenceImpl

All Implemented Interfaces:

javax.jdo.datastore.Sequence, NucleusSequence

public class JDOSequenceImpl
extends java.lang.Object
implements javax.jdo.datastore.Sequence, NucleusSequence

Basic generic implementation of a JDO2 datastore sequence for DB4O datastores. Utilises the "org.datanucleus.store_valuegenerator" extensions.

Field Summary

protected ValueGenerator	generator The generator for the sequence.
protected static Localiser	LOCALISER Localisation of messages
protected ObjectManager	om The controlling Object Manager.
protected SequenceMetaData	seqMetaData Name of the sequence.
protected StoreManager	storeManager Store Manager where we obtain our sequence.

Constructor Summary

JDOSequenceImpl(ObjectManager objectMgr, StoreManager storeMgr, SequenceMetaData seqmd)
Constructor.

Method Summary

void	allocate(int additional) Method to allocate a set of elements.
java.lang.Object	current() Accessor for the current element.
long	currentValue() Accessor for the current element in the sequence as a long.
java.lang.String	getName() Accessor for the sequence name.
java.lang.Object	next() Accessor for the next element in the sequence.
long	nextValue() Accessor for the next element in the sequence as a long.

Methods inherited from class java.lang.Object

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

Field Detail

LOCALISER

protected static final Localiser LOCALISER

Localisation of messages

storeManager

protected final StoreManager storeManager

Store Manager where we obtain our sequence.

seqMetaData

protected final SequenceMetaData seqMetaData

Name of the sequence.

generator

protected final ValueGenerator generator

The generator for the sequence.

om

protected final ObjectManager om

The controlling Object Manager.

Constructor Detail

JDOSequenceImpl

public JDOSequenceImpl(ObjectManager objectMgr,
                       StoreManager storeMgr,
                       SequenceMetaData seqmd)

Constructor.

Parameters:

objectMgr - The Object Manager managing the sequence

storeMgr - Manager of the store where we obtain the sequence

seqmd - MetaData defining the sequence

Method Detail

getName

public java.lang.String getName()

Accessor for the sequence name.

Specified by:

getName in interface javax.jdo.datastore.Sequence

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 javax.jdo.datastore.Sequence

Specified by:

allocate in interface NucleusSequence

Parameters:

additional - The number of additional elements to allocate

next

public java.lang.Object next()

Accessor for the next element in the sequence.

Specified by:

next in interface javax.jdo.datastore.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 javax.jdo.datastore.Sequence

Specified by:

nextValue in interface NucleusSequence

Returns:

The next element

Throws:

javax.jdo.JDODataStoreException - Thrown if not numeric

current

public java.lang.Object current()

Accessor for the current element.

Specified by:

current in interface javax.jdo.datastore.Sequence

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 javax.jdo.datastore.Sequence

Specified by:

currentValue in interface NucleusSequence

Returns:

The current element

Throws:

javax.jdo.JDODataStoreException - Thrown if not numeric