public class CursorableLinkedList<E> extends AbstractLinkedList<E> implements java.io.Serializable
List implementation with a ListIterator that
allows concurrent modifications to the underlying list.
This implementation supports all of the optional List operations.
It extends AbstractLinkedList and thus provides the
stack/queue/dequeue operations available in LinkedList.
The main feature of this class is the ability to modify the list and the
iterator at the same time. Both the listIterator() and cursor()
methods provides access to a Cursor instance which extends
ListIterator. The cursor allows changes to the list concurrent
with changes to the iterator. Note that the iterator() method and
sublists do not provide this cursor behaviour.
The Cursor class is provided partly for backwards compatibility
and partly because it allows the cursor to be directly closed. Closing the
cursor is optional because references are held via a WeakReference.
For most purposes, simply modify the iterator and list at will, and then let
the garbage collector to the rest.
Note that this implementation is not synchronized.
LinkedList,
Serialized Form| Modifier and Type | Class and Description |
|---|---|
static class |
CursorableLinkedList.Cursor<E>
An extended
ListIterator that allows concurrent changes to
the underlying list. |
| Constructor and Description |
|---|
CursorableLinkedList()
Constructor that creates.
|
CursorableLinkedList(java.util.Collection<? extends E> coll)
Constructor that copies the specified collection
|
| Modifier and Type | Method and Description |
|---|---|
CursorableLinkedList.Cursor<E> |
cursor()
Returns a
CursorableLinkedList.Cursor for iterating through the elements of this list. |
CursorableLinkedList.Cursor<E> |
cursor(int fromIndex)
Returns a
CursorableLinkedList.Cursor for iterating through the elements of this list
starting from a specified index. |
java.util.Iterator<E> |
iterator()
Returns an iterator that does not support concurrent modification.
|
java.util.ListIterator<E> |
listIterator()
Returns a cursor iterator that allows changes to the underlying list in parallel.
|
java.util.ListIterator<E> |
listIterator(int fromIndex)
Returns a cursor iterator that allows changes to the underlying list in parallel.
|
add, add, addAll, addAll, addFirst, addLast, clear, contains, containsAll, equals, get, getFirst, getLast, hashCode, indexOf, isEmpty, lastIndexOf, remove, remove, removeAll, removeFirst, removeLast, retainAll, set, size, subList, toArray, toArray, toStringpublic CursorableLinkedList()
public CursorableLinkedList(java.util.Collection<? extends E> coll)
coll - the collection to copypublic java.util.Iterator<E> iterator()
If the underlying list is modified while iterating using this iterator
a ConcurrentModificationException will occur.
The cursor behaviour is available via listIterator().
public java.util.ListIterator<E> listIterator()
The cursor enables iteration and list changes to occur in any order without invalidating the iterator (from one thread). When elements are added to the list, an event is fired to all active cursors enabling them to adjust to the change in the list.
When the "current" (i.e., last returned by ListIterator.next()
or ListIterator.previous()) element of the list is removed,
the cursor automatically adjusts to the change (invalidating the
last returned value such that it cannot be removed).
listIterator in interface java.util.List<E>listIterator in class AbstractLinkedList<E>public java.util.ListIterator<E> listIterator(int fromIndex)
The cursor enables iteration and list changes to occur in any order without invalidating the iterator (from one thread). When elements are added to the list, an event is fired to all active cursors enabling them to adjust to the change in the list.
When the "current" (i.e., last returned by ListIterator.next()
or ListIterator.previous()) element of the list is removed,
the cursor automatically adjusts to the change (invalidating the
last returned value such that it cannot be removed).
listIterator in interface java.util.List<E>listIterator in class AbstractLinkedList<E>fromIndex - the index to start frompublic CursorableLinkedList.Cursor<E> cursor()
CursorableLinkedList.Cursor for iterating through the elements of this list.
A Cursor is a ListIterator with an additional
close() method. Calling this method immediately discards the
references to the cursor. If it is not called, then the garbage collector
will still remove the reference as it is held via a WeakReference.
The cursor enables iteration and list changes to occur in any order without invalidating the iterator (from one thread). When elements are added to the list, an event is fired to all active cursors enabling them to adjust to the change in the list.
When the "current" (i.e., last returned by ListIterator.next()
or ListIterator.previous()) element of the list is removed,
the cursor automatically adjusts to the change (invalidating the
last returned value such that it cannot be removed).
The listIterator() method returns the same as this method, and can
be cast to a Cursor if the close method is required.
public CursorableLinkedList.Cursor<E> cursor(int fromIndex)
CursorableLinkedList.Cursor for iterating through the elements of this list
starting from a specified index.
A Cursor is a ListIterator with an additional
close() method. Calling this method immediately discards the
references to the cursor. If it is not called, then the garbage collector
will still remove the reference as it is held via a WeakReference.
The cursor enables iteration and list changes to occur in any order without invalidating the iterator (from one thread). When elements are added to the list, an event is fired to all active cursors enabling them to adjust to the change in the list.
When the "current" (i.e., last returned by ListIterator.next()
or ListIterator.previous()) element of the list is removed,
the cursor automatically adjusts to the change (invalidating the
last returned value such that it cannot be removed).
The listIterator(int) method returns the same as this method, and can
be cast to a Cursor if the close method is required.
fromIndex - the index to start fromjava.lang.IndexOutOfBoundsException - if the index is out of range
(index < 0 || index > size()).Copyright © 2010 - 2020 Adobe. All Rights Reserved