Class CacheEntries<K,V>

java.lang.Object

java.util.AbstractCollection<Map.Entry<K,V>>

java.util.AbstractSet<Map.Entry<K,V>>

org.apache.sis.util.collection.CacheEntries<K,V>

Type Parameters:

K - the type of key objects.

V - the type of value objects.

All Implemented Interfaces:

Iterable<Map.Entry<K,V>>, Collection<Map.Entry<K,V>>, Set<Map.Entry<K,V>>

final class CacheEntries<K,V>
extends AbstractSet<Map.Entry<K,V>>

The set of entries in the Cache.map. On iteration, handlers will be skipped and the values of weak references are returned instead of the Reference object.

This class is not needed for the normal working of Cache. it is used only if the user wants to see the cache entries through the standard Java collection API.

Thread safety

This class is thread-safe if and only if the Set given to the constructor is thread-safe.

Since:

0.3

Version:

0.3

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	CacheEntries.Iter<K,V>	An iterator over the entries in the Cache.map.

Field Summary

Fields

Modifier and Type	Field	Description
private final Set<Map.Entry<K,Object>>	entries	The set of entries in the Cache.map.

Constructor Summary

Constructors

Constructor	Description
CacheEntries(Set<Map.Entry<K,Object>> entries)	Wraps the given set of entries of a Cache.map.

Method Summary

Modifier and Type	Method	Description
boolean	isEmpty()	Returns true if the set is empty.
Iterator<Map.Entry<K,V>>	iterator()	Returns an iterator over the entries.
int	size()	Returns the number of entries.

Methods inherited from class AbstractSet

equals, hashCode, removeAll

Methods inherited from class AbstractCollection

add, addAll, clear, contains, containsAll, remove, retainAll, toArray, toArray, toString

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Collection

parallelStream, removeIf, stream

Methods inherited from interface Iterable

forEach

Methods inherited from interface Set

add, addAll, clear, contains, containsAll, remove, retainAll, spliterator, toArray, toArray

Field Details

entries

private final Set<Map.Entry<K,Object>> entries

The set of entries in the Cache.map.

Constructor Details

CacheEntries

CacheEntries(Set<Map.Entry<K,Object>> entries)

Wraps the given set of entries of a Cache.map.

Parameters:

entries - the set of entries. Implementation shall support concurrency.

Method Details

isEmpty

public boolean isEmpty()

Returns true if the set is empty. Overloaded because ConcurrentHashMap has a more efficient implementation of this method than testing size() == 0.

Specified by:

isEmpty in interface Collection<K>

Specified by:

isEmpty in interface Set<K>

Overrides:

isEmpty in class AbstractCollection<Map.Entry<K,V>>

size

public int size()

Returns the number of entries.

Specified by:

size in interface Collection<K>

Specified by:

size in interface Set<K>

Specified by:

size in class AbstractCollection<Map.Entry<K,V>>

iterator

public Iterator<Map.Entry<K,V>> iterator()

Returns an iterator over the entries.

Specified by:

iterator in interface Collection<K>

Specified by:

iterator in interface Iterable<K>

Specified by:

iterator in interface Set<K>

Specified by:

iterator in class AbstractCollection<Map.Entry<K,V>>