netx.jnlp.util
Class WeakList

java.lang.Object
  |
  +--java.util.AbstractCollection
        |
        +--java.util.AbstractList
              |
              +--netx.jnlp.util.WeakList

All Implemented Interfaces:

java.util.Collection, java.util.List

public class WeakList

extends java.util.AbstractList

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.

Version:

$Revision: 1.1 $

Author:

Jon A. Maxwell (JAM) - initial author

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

WeakList()
Create a weak random-access list.

Method Summary

void	add(int index, java.lang.Object element) Inserts the object at the specified position in the list.
java.lang.Object	get(int index) Returns the object at the specified index, or null if the object has been collected.
java.util.List	hardList() Returns a list of hard references to the objects.
java.lang.Object	remove(int index) Removes the object at the specified position and returns it or returns null if it was already collected.
java.lang.Object	set(int index, java.lang.Object 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() Returns the size of the list, including already collected objects.
void	trimToSize() Compacts the list by removing references to collected objects.

Methods inherited from class java.util.AbstractList

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

Methods inherited from class java.util.AbstractCollection

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

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

Constructor Detail

WeakList

public WeakList()

Create a weak random-access list.

Method Detail

get

public java.lang.Object get(int index)

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

Overrides:

get in class java.util.AbstractList

size

public int size()

Returns the size of the list, including already collected objects.

Overrides:

size in class java.util.AbstractCollection

set

public java.lang.Object set(int index,
                            java.lang.Object 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

add

public void add(int index,
                java.lang.Object 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

remove

public java.lang.Object 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

hardList

public java.util.List 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.