org.apache.openjpa.util
Class ArrayStateImage

java.lang.Object
  org.apache.openjpa.util.ArrayStateImage

public class ArrayStateImage
extends Object

Utilities for dealing with a simple state image consisting of an Object[] of field values with one extra index containing a BitSet of loaded fields. This simplistic state image might be used for optimistic versioning.

Author:

Abe White

Constructor Summary

ArrayStateImage()

Method Summary

static Object[]	clone(Object[] state) Clone a state array.
static BitSet	getLoaded(Object[] state) Get the loaded mask from a state image.
static boolean	isImage(Object obj) Return true if the given version object appears to be an array state image.
static Object[]	newImage(int numFields) Create a new state image for the given number of fields.
static boolean	sameVersion(Object[] state1, Object[] state2) Return whether the given images are equivalent from an optimistic locking perspective.
static void	setLoaded(Object[] state, BitSet loaded) Set the loaded mask into a state image.

Methods inherited from class java.lang.Object

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

Constructor Detail

ArrayStateImage

public ArrayStateImage()

Method Detail

newImage

public static Object[] newImage(int numFields)

Create a new state image for the given number of fields.

isImage

public static boolean isImage(Object obj)

Return true if the given version object appears to be an array state image.

getLoaded

public static BitSet getLoaded(Object[] state)

Get the loaded mask from a state image.

setLoaded

public static void setLoaded(Object[] state,
                             BitSet loaded)

Set the loaded mask into a state image.

clone

public static Object[] clone(Object[] state)

Clone a state array.

sameVersion

public static boolean sameVersion(Object[] state1,
                                  Object[] state2)

Return whether the given images are equivalent from an optimistic locking perspective.