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org.apache.commons.collections
Class CursorableLinkedList  

java.lang.Object
  org.apache.commons.collections.CursorableLinkedList

All Implemented Interfaces:

java.util.Collection, java.lang.Iterable, java.util.List, java.io.Serializable

Direct Known Subclasses:

CursorableSubList

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public class CursorableLinkedList

extends java.lang.Object

implements java.util.List, java.io.Serializable

A doubly-linked list implementation of the java.util.List interface, supporting a java.util.ListIterator that allows concurrent modifications to the underlying list.

Implements all of the optional java.util.List operations, the stack/queue/dequeue operations available in java.util.LinkedList and supports a java.util.ListIterator that allows concurrent modifications to the underlying list (see cursor() 55 ).

Note that this implementation is not synchronized.

Since:

1.0

Version:

$Id: CursorableLinkedList.java,v 1.10.2.1 2004/05/22 12:14:02 scolebourne Exp $

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Nested Class Summary
class	CursorableLinkedList.Cursor
(package private)  class	CursorableLinkedList.Listable
(package private)  class	CursorableLinkedList.ListIter

 

Field Summary
protected  java.util.List	_cursors           A list of the currently CursorableLinkedList.Cursors currently open in this list.
protected  CursorableLinkedList.Listable	_head           A sentry node.
protected  int	_modCount           Tracks the number of structural modifications to me.
protected  int	_size           The number of elements in me.

 

Constructor Summary

CursorableLinkedList()

 

Method Summary
void	add(int index, java.lang.Object element)           Inserts the specified element at the specified position in this list.
boolean	add(java.lang.Object o)           Appends the specified element to the end of this list.
boolean	addAll(java.util.Collection c)           Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified java.util.Collection's java.util.Iterator.
boolean	addAll(int index, java.util.Collection c)           Inserts all of the elements in the specified collection into this list at the specified position.
boolean	addFirst(java.lang.Object o)           Inserts the specified element at the beginning of this list.
boolean	addLast(java.lang.Object o)           Inserts the specified element at the end of this list.
protected  void	broadcastListableChanged(CursorableLinkedList.Listable elt)           Informs all of my registerd cursors that the specified element was changed.
protected  void	broadcastListableInserted(CursorableLinkedList.Listable elt)           Informs all of my registered cursors tha the specifed element was just added to my list.
protected  void	broadcastListableRemoved(CursorableLinkedList.Listable elt)           Informs all of my registered cursors tha the specifed element was just removed from my list.
void	clear()           Removes all of the elements from this list.
boolean	contains(java.lang.Object o)           Returns true if this list contains the specified element.
boolean	containsAll(java.util.Collection c)           Returns true if this list contains all of the elements of the specified collection.
CursorableLinkedList.Cursor	cursor()           Returns a java.util.ListIterator for iterating through the elements of this list.
CursorableLinkedList.Cursor	cursor(int i)           Returns a java.util.ListIterator for iterating through the elements of this list, initialized such that ListIterator.next()>ListIterator.next() 55 will return the element at the specified index (if any) and ListIterator.previous()>ListIterator.previous() 55 will return the element immediately preceeding it (if any).
boolean	equals(java.lang.Object o)           Compares the specified object with this list for equality.
java.lang.Object	get(int index)           Returns the element at the specified position in this list.
java.lang.Object	getFirst()           Returns the element at the beginning of this list.
java.lang.Object	getLast()           Returns the element at the end of this list.
protected  CursorableLinkedList.Listable	getListableAt(int index)           Returns the CursorableLinkedList.Listable at the specified index.
int	hashCode()           Returns the hash code value for this list.
int	indexOf(java.lang.Object o)           Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element.
protected  CursorableLinkedList.Listable	insertListable(CursorableLinkedList.Listable before, CursorableLinkedList.Listable after, java.lang.Object value)           Inserts a new value into my list, after the specified before element, and before the specified after element
protected  void	invalidateCursors()           Informs all of my registerd cursors that they are now invalid.
boolean	isEmpty()           Returns true if this list contains no elements.
java.util.Iterator	iterator()           Returns a fail-fast iterator.
int	lastIndexOf(java.lang.Object o)           Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element.
java.util.ListIterator	listIterator()           Returns a fail-fast ListIterator.
java.util.ListIterator	listIterator(int index)           Returns a fail-fast ListIterator.
private  void	readObject(java.io.ObjectInputStream in)
protected  void	registerCursor(CursorableLinkedList.Cursor cur)           Registers a CursorableLinkedList.Cursor to be notified of changes to this list.
java.lang.Object	remove(int index)           Removes the element at the specified position in this list (optional operation).
boolean	remove(java.lang.Object o)           Removes the first occurrence in this list of the specified element.
boolean	removeAll(java.util.Collection c)           Removes from this list all the elements that are contained in the specified collection.
java.lang.Object	removeFirst()           Removes the first element of this list, if any.
java.lang.Object	removeLast()           Removes the last element of this list, if any.
protected  void	removeListable(CursorableLinkedList.Listable elt)           Removes the given CursorableLinkedList.Listable from my list.
boolean	retainAll(java.util.Collection c)           Retains only the elements in this list that are contained in the specified collection.
java.lang.Object	set(int index, java.lang.Object element)           Replaces the element at the specified position in this list with the specified element.
int	size()           Returns the number of elements in this list.
java.util.List	subList(int i, int j)           Returns a fail-fast sublist.
java.lang.Object[]	toArray()           Returns an array containing all of the elements in this list in proper sequence.
java.lang.Object[]	toArray(java.lang.Object[] a)           Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array.
java.lang.String	toString()           Returns a java.lang.String representation of this list, suitable for debugging.
protected  void	unregisterCursor(CursorableLinkedList.Cursor cur)           Removes a CursorableLinkedList.Cursor from the set of cursors to be notified of changes to this list.
private  void	writeObject(java.io.ObjectOutputStream out)

 

Methods inherited from class java.lang.Object

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

 

Field Detail

_size

protected transient int _size

The number of elements in me.

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_head

protected transient CursorableLinkedList.Listable _head

A sentry node.

_head.next() points to the first element in the list, _head.prev() to the last. Note that it is possible for _head.next().prev() and _head.prev().next() to be non-null, as when I am a sublist for some larger list. Use == _head.next() and == _head.prev() to determine if a given CursorableLinkedList.Listable is the first or last element in the list.

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_modCount

protected int _modCount

Tracks the number of structural modifications to me.

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_cursors

protected java.util.List _cursors

A list of the currently CursorableLinkedList.Cursors currently open in this list.

Constructor Detail

CursorableLinkedList

public CursorableLinkedList()

Method Detail

add

public boolean add(java.lang.Object o)

Appends the specified element to the end of this list.

Specified by:

add in interface java.util.List

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add

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

Inserts the specified element at the specified position in this list. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).

Specified by:

add in interface java.util.List

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addAll

public boolean addAll(java.util.Collection c)

Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified java.util.Collection's java.util.Iterator. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)

Specified by:

addAll in interface java.util.List

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addAll

public boolean addAll(int index,
                      java.util.Collection c)

Inserts all of the elements in the specified collection into this list at the specified position. Shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in this list in the order that they are returned by the specified java.util.Collection's java.util.Iterator. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)

Specified by:

addAll in interface java.util.List

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addFirst

public boolean addFirst(java.lang.Object o)

Inserts the specified element at the beginning of this list. (Equivalent to add(0,o) 55 ).

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addLast

public boolean addLast(java.lang.Object o)

Inserts the specified element at the end of this list. (Equivalent to add(java.lang.Object) 55 ).

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clear

public void clear()

Removes all of the elements from this list. This list will be empty after this call returns (unless it throws an exception).

Specified by:

clear in interface java.util.List

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contains

public boolean contains(java.lang.Object o)

Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).

Specified by:

contains in interface java.util.List

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containsAll

public boolean containsAll(java.util.Collection c)

Returns true if this list contains all of the elements of the specified collection.

Specified by:

containsAll in interface java.util.List

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cursor

public CursorableLinkedList.Cursor cursor()

Returns a java.util.ListIterator for iterating through the elements of this list. Unlike iterator() 55 , a cursor is not bothered by concurrent modifications to the underlying list.

Specifically, when elements are added to the list before or after the cursor, the cursor simply picks them up automatically. When the "current" (i.e., last returned by ListIterator.next()>ListIterator.next() 55 or ListIterator.previous()>ListIterator.previous() 55 ) element of the list is removed, the cursor automatically adjusts to the change (invalidating the last returned value--i.e., it cannot be removed).

Note that the returned java.util.ListIterator does not support the ListIterator.nextIndex()>ListIterator.nextIndex() 55 and ListIterator.previousIndex()>ListIterator.previousIndex() 55 methods (they throw java.lang.UnsupportedOperationException when invoked.

Clients must close the cursor when they are done using it. The returned java.util.ListIterator will be an instance of CursorableLinkedList.Cursor. To close the cursor, cast the java.util.ListIterator to CursorableLinkedList.Cursor and invoke the CursorableLinkedList.Cursor.close() 55 method.

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cursor

public CursorableLinkedList.Cursor cursor(int i)

Returns a java.util.ListIterator for iterating through the elements of this list, initialized such that ListIterator.next()>ListIterator.next() 55 will return the element at the specified index (if any) and ListIterator.previous()>ListIterator.previous() 55 will return the element immediately preceeding it (if any). Unlike iterator() 55 , a cursor is not bothered by concurrent modifications to the underlying list.

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equals

public boolean equals(java.lang.Object o)

Compares the specified object with this list for equality. Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two lists are defined to be equal if they contain the same elements in the same order. This definition ensures that the equals method works properly across different implementations of the List interface.

Specified by:

equals in interface java.util.List

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get

public java.lang.Object get(int index)

Returns the element at the specified position in this list.

Specified by:

get in interface java.util.List

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getFirst

public java.lang.Object getFirst()

Returns the element at the beginning of this list.

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getLast

public java.lang.Object getLast()

Returns the element at the end of this list.

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hashCode

public int hashCode()

Returns the hash code value for this list. The hash code of a list is defined to be the result of the following calculation:

  hashCode = 1;
  Iterator i = list.iterator();
  while (i.hasNext()) {
      Object obj = i.next();
      hashCode = 31*hashCode + (obj==null ? 0 : obj.hashCode());
  }
 

This ensures that list1.equals(list2) implies that list1.hashCode()==list2.hashCode() for any two lists, list1 and list2, as required by the general contract of Object.hashCode.

Specified by:

hashCode in interface java.util.List

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indexOf

public int indexOf(java.lang.Object o)

Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.

Specified by:

indexOf in interface java.util.List

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isEmpty

public boolean isEmpty()

Returns true if this list contains no elements.

Specified by:

isEmpty in interface java.util.List

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iterator

public java.util.Iterator iterator()

Returns a fail-fast iterator.

Specified by:

iterator in interface java.util.List

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lastIndexOf

public int lastIndexOf(java.lang.Object o)

Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.

Specified by:

lastIndexOf in interface java.util.List

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listIterator

public java.util.ListIterator listIterator()

Returns a fail-fast ListIterator.

Specified by:

listIterator in interface java.util.List

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listIterator

public java.util.ListIterator listIterator(int index)

Returns a fail-fast ListIterator.

Specified by:

listIterator in interface java.util.List

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remove

public boolean remove(java.lang.Object o)

Removes the first occurrence in this list of the specified element. If this list does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))) (if such an element exists).

Specified by:

remove in interface java.util.List

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remove

public java.lang.Object remove(int index)

Removes the element at the specified position in this list (optional operation). Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the list.

Specified by:

remove in interface java.util.List

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removeAll

public boolean removeAll(java.util.Collection c)

Removes from this list all the elements that are contained in the specified collection.

Specified by:

removeAll in interface java.util.List

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removeFirst

public java.lang.Object removeFirst()

Removes the first element of this list, if any.

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removeLast

public java.lang.Object removeLast()

Removes the last element of this list, if any.

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retainAll

public boolean retainAll(java.util.Collection c)

Retains only the elements in this list that are contained in the specified collection. In other words, removes from this list all the elements that are not contained in the specified collection.

Specified by:

retainAll in interface java.util.List

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set

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

Replaces the element at the specified position in this list with the specified element.

Specified by:

set in interface java.util.List

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size

public int size()

Returns the number of elements in this list.

Specified by:

size in interface java.util.List

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toArray

public java.lang.Object[] toArray()

Returns an array containing all of the elements in this list in proper sequence. Obeys the general contract of the Collection.toArray()>Collection.toArray() 55 method.

Specified by:

toArray in interface java.util.List

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toArray

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

Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array. Obeys the general contract of the Collection.toArray()>Collection.toArray() 55 method.

Specified by:

toArray in interface java.util.List

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toString

public java.lang.String toString()

Returns a java.lang.String representation of this list, suitable for debugging.

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subList

public java.util.List subList(int i,
                              int j)

Returns a fail-fast sublist.

Specified by:

subList in interface java.util.List

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insertListable

protected CursorableLinkedList.Listable insertListable(CursorableLinkedList.Listable before,
                                                       CursorableLinkedList.Listable after,
                                                       java.lang.Object value)

Inserts a new value into my list, after the specified before element, and before the specified after element

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removeListable

protected void removeListable(CursorableLinkedList.Listable elt)

Removes the given CursorableLinkedList.Listable from my list.

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getListableAt

protected CursorableLinkedList.Listable getListableAt(int index)

Returns the CursorableLinkedList.Listable at the specified index.

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registerCursor

protected void registerCursor(CursorableLinkedList.Cursor cur)

Registers a CursorableLinkedList.Cursor to be notified of changes to this list.

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unregisterCursor

protected void unregisterCursor(CursorableLinkedList.Cursor cur)

Removes a CursorableLinkedList.Cursor from the set of cursors to be notified of changes to this list.

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invalidateCursors

protected void invalidateCursors()

Informs all of my registerd cursors that they are now invalid.

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broadcastListableChanged

protected void broadcastListableChanged(CursorableLinkedList.Listable elt)

Informs all of my registerd cursors that the specified element was changed.

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broadcastListableRemoved

protected void broadcastListableRemoved(CursorableLinkedList.Listable elt)

Informs all of my registered cursors tha the specifed element was just removed from my list.

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broadcastListableInserted

protected void broadcastListableInserted(CursorableLinkedList.Listable elt)

Informs all of my registered cursors tha the specifed element was just added to my list.

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writeObject

private void writeObject(java.io.ObjectOutputStream out)
                  throws java.io.IOException

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readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

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