Class UUIDStringGenerator

java.lang.Object

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

org.datanucleus.store.valuegenerator.AbstractUUIDGenerator

org.datanucleus.store.valuegenerator.UUIDStringGenerator

All Implemented Interfaces:

ValueGenerator<String>

public class UUIDStringGenerator
extends AbstractUUIDGenerator

Value generator for a UUID String format. Results in Strings of length 16 characters, containing the IP address of the local machine as per the JDO spec section 18.6.1.

Field Summary

Fields inherited from class AbstractUUIDGenerator

counter, IP_ADDRESS, JVM_UNIQUE

Fields inherited from class AbstractGenerator

allocationSize, block, initialValue, name, storeMgr

Fields inherited from interface 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
UUIDStringGenerator(StoreManager storeMgr, String name)	Constructor.

Method Summary

Modifier and Type	Method	Description
private static byte[]	getBytesFromInt(int val)	Utility to convert an int into a byte array
private static byte[]	getBytesFromShort(short val)	Utility to convert a short into a a byte array
protected String	getIdentifier()	Create an identifier with the form "IIIIJJJJHHLLLLCC".
static Class	getStorageClass()	Accessor for the storage class for values generated with this generator.

Methods inherited from class AbstractUUIDGenerator

getCount, reserveBlock

Methods inherited from class AbstractGenerator

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

Methods inherited from class Object

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

Constructor Details

UUIDStringGenerator

public UUIDStringGenerator(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)

getIdentifier

protected String getIdentifier()

Create an identifier with the form "IIIIJJJJHHLLLLCC". Where IIII is the IP address, JJJJ is something unique across JVMs, HH is the High Time, LLLL is the low time, and CC is a count.

Specified by:

getIdentifier in class AbstractUUIDGenerator

Returns:

The identifier

getBytesFromInt

private static byte[] getBytesFromInt(int val)

Utility to convert an int into a byte array

Parameters:

val - The int

Returns:

The bytes

getBytesFromShort

private static byte[] getBytesFromShort(short val)

Utility to convert a short into a a byte array

Parameters:

val - The short

Returns:

The bytes