Package org.datanucleus.store.valuegenerator

Class AbstractUUIDGenerator

java.lang.Object

org.datanucleus.store.valuegenerator.AbstractGenerator<String>

org.datanucleus.store.valuegenerator.AbstractUUIDGenerator

All Implemented Interfaces:

ValueGenerator<String>

Direct Known Subclasses:

UUIDHexGenerator, UUIDStringGenerator

public abstract class AbstractUUIDGenerator
extends AbstractGenerator<String>

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

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static short	counter
(package private) static final int	IP_ADDRESS	IP Address of local machine.
(package private) static final int	JVM_UNIQUE	Unique value across JVMs on this machine.

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

allocationSize, block, initialValue, name, storeMgr

Fields inherited from interface org.datanucleus.store.valuegenerator.ValueGenerator

PROPERTY_CATALOG_NAME, PROPERTY_CLASS_NAME, PROPERTY_COLUMN_NAME, PROPERTY_FIELD_NAME, PROPERTY_KEY_CACHE_SIZE, PROPERTY_KEY_DATABASE_CACHE_SIZE, PROPERTY_KEY_INITIAL_VALUE, PROPERTY_KEY_MAX_VALUE, PROPERTY_KEY_MIN_VALUE, PROPERTY_ROOT_CLASS_NAME, PROPERTY_SCHEMA_NAME, PROPERTY_SEQUENCE_NAME, PROPERTY_SEQUENCETABLE_CATALOG, PROPERTY_SEQUENCETABLE_NAME_COLUMN, PROPERTY_SEQUENCETABLE_NEXTVAL_COLUMN, PROPERTY_SEQUENCETABLE_SCHEMA, PROPERTY_SEQUENCETABLE_TABLE, PROPERTY_TABLE_NAME

Constructor Summary

Constructors

Constructor	Description
AbstractUUIDGenerator(StoreManager storeMgr, String name)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected short	getCount()	Simple counter for identities.
protected abstract String	getIdentifier()	Create an identifier in the required UUID format required.
private static int	getIntFromByteArray(byte[] bytes)	Utility to convert a byte array to an int.
static Class	getStorageClass()	Accessor for the storage class for values generated with this generator.
protected ValueGenerationBlock<String>	reserveBlock(long size)	Method to reserve "size" values to the block.

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

allocate, current, currentValue, getName, next, nextValue, obtainGenerationBlock, obtainGenerationBlock, reserveBlock

Methods inherited from class java.lang.Object

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

Field Details

IP_ADDRESS

static final int IP_ADDRESS

IP Address of local machine.

JVM_UNIQUE

static final int JVM_UNIQUE

Unique value across JVMs on this machine.

counter

static short counter

Constructor Details

AbstractUUIDGenerator

public AbstractUUIDGenerator(StoreManager storeMgr,
 String name)

Constructor.

Parameters:

storeMgr - StoreManager

name - Symbolic name for this generator

Method Details

getStorageClass

public static Class getStorageClass()

Accessor for the storage class for values generated with this generator.

Returns:

Storage class (in this case String.class)

reserveBlock

protected ValueGenerationBlock<String> reserveBlock(long size)

Method to reserve "size" values to the block.

Specified by:

reserveBlock in class AbstractGenerator<String>

Parameters:

size - The block size

Returns:

The reserved block

getIdentifier

protected abstract String getIdentifier()

Create an identifier in the required UUID format required.

Returns:

The identifier

getCount

protected short getCount()

Simple counter for identities.

Returns:

The next count value

getIntFromByteArray

private static int getIntFromByteArray(byte[] bytes)

Utility to convert a byte array to an int.

Parameters:

bytes - The byte array

Returns:

The int