org.datanucleus.store.valuegenerator
Class AbstractUUIDGenerator

java.lang.Object
  org.datanucleus.store.valuegenerator.AbstractGenerator
      org.datanucleus.store.valuegenerator.AbstractUIDGenerator
          org.datanucleus.store.valuegenerator.AbstractUUIDGenerator

All Implemented Interfaces:

ValueGenerator

Direct Known Subclasses:

UUIDHexGenerator, UUIDStringGenerator

public abstract class AbstractUUIDGenerator
extends AbstractUIDGenerator

Value generator for a UUID format. To be extended by implementations giving the UUID in particular forms.

Field Summary

protected static short	counter
protected static int	IP_ADDRESS IP Address of local machine.
protected static int	JVM_UNIQUE Unique value across JVMs on this machine.

Fields inherited from class org.datanucleus.store.valuegenerator.AbstractGenerator

allocationSize, block, initialValue, LOCALISER, name, properties, repositoryExists

Constructor Summary

AbstractUUIDGenerator(java.lang.String name, java.util.Properties props)
Constructor.

Method Summary

protected short

getCount() Simple counter for identities.

Methods inherited from class org.datanucleus.store.valuegenerator.AbstractUIDGenerator

getIdentifier, getStorageClass, reserveBlock

Methods inherited from class org.datanucleus.store.valuegenerator.AbstractGenerator

allocate, createRepository, current, currentValue, getName, next, nextValue, obtainGenerationBlock, obtainGenerationBlock, repositoryExists, requiresRepository, reserveBlock

Methods inherited from class java.lang.Object

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

Field Detail

IP_ADDRESS

protected static final int IP_ADDRESS

IP Address of local machine.

JVM_UNIQUE

protected static final int JVM_UNIQUE

Unique value across JVMs on this machine.

counter

protected static short counter

Constructor Detail

AbstractUUIDGenerator

public AbstractUUIDGenerator(java.lang.String name,
                             java.util.Properties props)

Constructor.

Parameters:

name - Symbolic name for this generator

props - Properties controlling its behaviour

Method Detail

getCount

protected short getCount()

Simple counter for identities.

Returns:

The next count value