Package net.sourceforge.jnlp.util

Class WeakList<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

net.sourceforge.jnlp.util.WeakList<E>

Type Parameters:

E - generic typeto be used in this list

public class WeakList<E>
extends java.util.AbstractList<E>

This list stores objects automatically using weak references. Objects are added and removed from the list as normal, but may turn to null at any point (ie, indexOf(x) followed by get(x) may return null). The weak references are only removed when the trimToSize method is called so that the indices remain constant otherwise.

Field Summary

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor	Description
WeakList()	Create a weak random-access list.

Method Summary

Modifier and Type	Method	Description
void	add(int index, E element)	Inserts the object at the specified position in the list.
E	get(int index)
java.util.List<E>	hardList()
E	remove(int index)	Removes the object at the specified position and returns it or returns null if it was already collected.
E	set(int index, E element)	Sets the object at the specified position and returns the previous object at that position or null if it was already collected.
int	size()
void	trimToSize()	Compacts the list by removing references to collected objects.

Methods inherited from class java.util.AbstractCollection

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.util.AbstractList

add, addAll, clear, equals, hashCode, indexOf, iterator, lastIndexOf, listIterator, listIterator, removeRange, subList

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

addAll, contains, containsAll, isEmpty, of, of, of, of, of, of, of, of, of, of, of, of, remove, removeAll, replaceAll, retainAll, sort, spliterator, toArray, toArray

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakList

public WeakList()

Create a weak random-access list.

Method Detail

get

public E get(int index)

Specified by:

get in class java.util.AbstractList<E>

Parameters:

index - of field to get

Returns:

the object at the specified index, or null if the object has been collected.

size

public int size()

Specified by:

size in class java.util.AbstractCollection<E>

Returns:

the size of the list, including already collected objects.

set

public E set(int index,
             E element)

Sets the object at the specified position and returns the previous object at that position or null if it was already collected.

Overrides:

set in class java.util.AbstractList<E>

Parameters:

index - position where to place element

element - data which to put on position

Returns:

previous object on that position

add

public void add(int index,
                E element)

Inserts the object at the specified position in the list. Automatically creates a weak reference to the object.

Overrides:

add in class java.util.AbstractList<E>

Parameters:

index - position where to insert element

element - data which to put on position

remove

public E remove(int index)

Removes the object at the specified position and returns it or returns null if it was already collected.

Overrides:

remove in class java.util.AbstractList<E>

Parameters:

index - of element to be removed

Returns:

previous object on that position

hardList

public java.util.List<E> hardList()

Returns:

a list of hard references to the objects. The returned list does not include the collected elements, so its indices do not necessarily correlate with those of this list.

trimToSize

public void trimToSize()

Compacts the list by removing references to collected objects.