jadex.commons.collection

Class WeakSet<T>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<T>

jadex.commons.collection.WeakSet<T>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<T>, java.util.Collection<T>, java.util.Set<T>

public class WeakSet<T>
extends java.util.AbstractSet<T>
implements java.io.Serializable, java.lang.Cloneable

A weak set for entries that will be automatically removed when no references to them are existing any more.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.ref.ReferenceQueue	queue The reference queue used to get object removal notifications.
protected java.util.Set	serialized_set
protected java.util.Set	set The set which will be used for element storage.

Constructor Summary

Constructors

Constructor and Description
WeakSet() Construct a WeakSet based on a HashSet.

Method Summary

Modifier and Type	Method and Description
boolean	add(java.lang.Object obj) Add an element to the set.
void	clear() Removes all of the elements from this set.
java.lang.Object	clone() Returns a shallow copy of this WeakSet instance: the elements themselves are not cloned.
boolean	contains(java.lang.Object obj) Returns true if this set contains the specified element.
protected void	expungeStaleEntries() Remove garbage collected entries.
boolean	isEmpty() Returns true if this set contains no elements.
java.util.Iterator	iterator() Return an iteration over the elements in the set.
protected java.lang.Object	readResolve() Perform special handling on serialization.
boolean	remove(java.lang.Object obj) Removes the given element from this set if it is present.
int	size() Return the size of the set.
java.lang.Object[]	toArray() Convert the set to an array.
java.lang.Object[]	toArray(java.lang.Object[] result) Convert the set to an array.
protected java.lang.Object	writeReplace() Perform special handling on serialization.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, retainAll, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, containsAll, retainAll, spliterator

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Field Detail

set

protected transient java.util.Set set

The set which will be used for element storage.

queue

protected transient java.lang.ref.ReferenceQueue queue

The reference queue used to get object removal notifications.

serialized_set

protected java.util.Set serialized_set

Constructor Detail

WeakSet

public WeakSet()

Construct a WeakSet based on a HashSet.

Method Detail

size

public int size()

Return the size of the set.

Specified by:

size in interface java.util.Collection<T>

Specified by:

size in interface java.util.Set<T>

Specified by:

size in class java.util.AbstractCollection<T>

Returns:

The size of the set.

iterator

public java.util.Iterator iterator()

Return an iteration over the elements in the set.

Specified by:

iterator in interface java.lang.Iterable<T>

Specified by:

iterator in interface java.util.Collection<T>

Specified by:

iterator in interface java.util.Set<T>

Specified by:

iterator in class java.util.AbstractCollection<T>

Returns:

An iteration over the elements in the set.

toArray

public java.lang.Object[] toArray()

Convert the set to an array.

Specified by:

toArray in interface java.util.Collection<T>

Specified by:

toArray in interface java.util.Set<T>

Overrides:

toArray in class java.util.AbstractCollection<T>

toArray

public java.lang.Object[] toArray(java.lang.Object[] result)

Convert the set to an array.

Specified by:

toArray in interface java.util.Collection<T>

Specified by:

toArray in interface java.util.Set<T>

Overrides:

toArray in class java.util.AbstractCollection<T>

add

public boolean add(java.lang.Object obj)

Add an element to the set.

Specified by:

add in interface java.util.Collection<T>

Specified by:

add in interface java.util.Set<T>

Overrides:

add in class java.util.AbstractCollection<T>

Parameters:

obj - Element to add to the set.

Returns:

True if the element was added.

isEmpty

public boolean isEmpty()

Returns true if this set contains no elements.

Specified by:

isEmpty in interface java.util.Collection<T>

Specified by:

isEmpty in interface java.util.Set<T>

Overrides:

isEmpty in class java.util.AbstractCollection<T>

Returns:

true if this set contains no elements.

contains

public boolean contains(java.lang.Object obj)

Returns true if this set contains the specified element.

Specified by:

contains in interface java.util.Collection<T>

Specified by:

contains in interface java.util.Set<T>

Overrides:

contains in class java.util.AbstractCollection<T>

Parameters:

obj - Element whose presence in this set is to be tested.

Returns:

true if this set contains the specified element.

remove

public boolean remove(java.lang.Object obj)

Removes the given element from this set if it is present.

Specified by:

remove in interface java.util.Collection<T>

Specified by:

remove in interface java.util.Set<T>

Overrides:

remove in class java.util.AbstractCollection<T>

Parameters:

obj - Object to be removed from this set, if present.

Returns:

true if the set contained the specified element.

clear

public void clear()

Removes all of the elements from this set.

Specified by:

clear in interface java.util.Collection<T>

Specified by:

clear in interface java.util.Set<T>

Overrides:

clear in class java.util.AbstractCollection<T>

clone

public java.lang.Object clone()

Returns a shallow copy of this WeakSet instance: the elements themselves are not cloned.

Overrides:

clone in class java.lang.Object

Returns:

A shallow copy of this set.

expungeStaleEntries

protected final void expungeStaleEntries()

Remove garbage collected entries.

writeReplace

protected java.lang.Object writeReplace()
                                 throws java.io.ObjectStreamException

Perform special handling on serialization.

Throws:

java.io.ObjectStreamException

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Perform special handling on serialization.

Throws:

java.io.ObjectStreamException