Module org.eclipse.persistence.core

Package org.eclipse.persistence.internal.identitymaps

Class AbstractIdentityMapEnumeration<T>

java.lang.Object

org.eclipse.persistence.internal.identitymaps.AbstractIdentityMapEnumeration<T>

Type Parameters:

T - type of iterated CacheKey content

All Implemented Interfaces:

Enumeration<T>

Direct Known Subclasses:

IdentityMapEnumeration, IdentityMapKeyEnumeration

public abstract class AbstractIdentityMapEnumeration<T>
extends Object
implements Enumeration<T>

Abstract Enumeration interface implementation for IdentityMap interface. Allows to iterate over CacheKey instances stored in the map.

Field Summary

Fields

Modifier and Type	Field	Description
protected Iterator<CacheKey>	cacheKeysIterator	CacheKey instances iterator.
protected CacheKey	nextKey	Next key to be returned.
protected boolean	shouldCheckReadLocks	Value of true if readLocks should be checked or false otherwise.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractIdentityMapEnumeration(Collection<CacheKey> keys, boolean shouldCheckReadLocks)	Creates an instance of CacheKey content enumeration.

Method Summary

Modifier and Type	Method	Description
protected CacheKey	getNextElement()	Get next element of CacheKey instances enumeration if this enumeration object has at least one more element to provide.
boolean	hasMoreElements()	Check whether this enumeration contains more elements.
abstract T	nextElement()	Get next element of CacheKey content enumeration if this enumeration object has at least one more element to provide.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Enumeration

asIterator

Field Detail

cacheKeysIterator

protected final Iterator<CacheKey> cacheKeysIterator

CacheKey instances iterator.

nextKey

protected CacheKey nextKey

Next key to be returned.

shouldCheckReadLocks

protected boolean shouldCheckReadLocks

Value of true if readLocks should be checked or false otherwise.

Constructor Detail

AbstractIdentityMapEnumeration

protected AbstractIdentityMapEnumeration(Collection<CacheKey> keys,
                                         boolean shouldCheckReadLocks)

Creates an instance of CacheKey content enumeration.

Parameters:

keys - Collection of CacheKey instances to be iterated

shouldCheckReadLocks - value of true if read lock on the CacheKey instances should be checked or false otherwise

Method Detail

hasMoreElements

public boolean hasMoreElements()

Check whether this enumeration contains more elements.

Specified by:

hasMoreElements in interface Enumeration<T>

Returns:

value of true if this enumeration object contains at least one more element to provide or false otherwise

nextElement

public abstract T nextElement()

Get next element of CacheKey content enumeration if this enumeration object has at least one more element to provide. It it expected that this method will be implemented using getNextElement() in child classes.

Specified by:

nextElement in interface Enumeration<T>

Returns:

the next element of this enumeration

Throws:

NoSuchElementException - if no more elements exist

getNextElement

protected CacheKey getNextElement()

Get next element of CacheKey instances enumeration if this enumeration object has at least one more element to provide.

Returns:

the next element of this enumeration

Throws:

NoSuchElementException - if no more elements exist