class StrongReference<T> extends Object implements Referrer<T>, Serializable
Ref.STRONG
Modifier and Type | Field and Description |
---|---|
private int |
hash |
private T |
referent |
private static long |
serialVersionUID |
Constructor and Description |
---|
StrongReference(T referent)
Creates a new strong reference that refers to the given object.
|
StrongReference(T referent,
ReferenceQueue<? super T> q)
Creates a new strong reference that refers to the given object.
|
Modifier and Type | Method and Description |
---|---|
void |
clear() |
boolean |
enqueue() |
boolean |
equals(Object o)
Equals is calculated on IDENTITY or EQUALITY.
|
T |
get() |
int |
hashCode()
Standard hashCode calculation for IDENTITY based references, where k
is the referent.
|
boolean |
isEnqueued() |
private void |
readObject(ObjectInputStream stream) |
String |
toString() |
(package private) Object |
writeReplace() |
private static final long serialVersionUID
private T referent
private final int hash
StrongReference(T referent)
referent
- object the new weak reference will refer toStrongReference(T referent, ReferenceQueue<? super T> q)
referent
- object the new weak reference will refer toq
- queue is never used.public int hashCode()
Referrer
Standard hashCode calculation for IDENTITY based references, where k is the referent. This may be stored in a final field:
int hash = 7;
hash = 29 * hash + System.identityHashCode(k);
hash = 29 * hash + k.getClass().hashCode();
Standard hashCode calculation for EQUALITY based references, where k is the referent:
int hash = 7;
hash = 29 * hash + k.hashCode();
hash = 29 * hash + k.getClass().hashCode();
The hash must be calculated during construction and if the reference is cleared, the recorded hashCode returned. While the referent remains reachable the hashCode must be calculated each time.
public boolean equals(Object o)
Referrer
Equals is calculated on IDENTITY or EQUALITY.
IDENTITY calculation:
if (this == o) return true;
if (!(o instanceof Referrer)) return false;
Object k1 = get();
Object k2 = ((Referrer) o).get();
if ( k1 != null && k1 == k2 ) return true;
return ( k1 == null && k2 == null && hashCode() == o.hashCode());
if (this == o) return true; // Same reference.
if (!(o instanceof Referrer)) return false;
Object k1 = get();
Object k2 = ((Referrer) o).get();
if ( k1 != null && k1.equals(k2)) return true;
return ( k1 == null && k2 == null && hashCode() == o.hashCode());
public void clear()
clear
in interface Referrer<T>
Reference.clear()
final Object writeReplace() throws ObjectStreamException
ObjectStreamException
private void readObject(ObjectInputStream stream) throws InvalidObjectException
InvalidObjectException
public T get()
get
in interface Referrer<T>
Reference.get()
public boolean isEnqueued()
isEnqueued
in interface Referrer<T>
Reference.isEnqueued()
public boolean enqueue()
enqueue
in interface Referrer<T>
Reference.enqueue()
Copyright 2007-2013, multiple authors.
Licensed under the Apache License, Version 2.0, see the NOTICE file for attributions.