org.jgroups.util

Class List

public class List extends Object implements Externalizable, Cloneable

Doubly-linked list. Elements can be added at head or tail and removed from head/tail. This class is tuned for element access at either head or tail, random access to elements is not very fast; in this case use Vector. Concurrent access is supported: a thread is blocked while another thread adds/removes an object. When no objects are available, removal returns null.

Author: Bela Ban

Field Summary
protected List.Element	head
protected Object	mutex
protected int	size
protected List.Element	tail

Constructor Summary
	List()

Method Summary
void	add(Object obj) Adds an object at the tail of the list.
void	addAtHead(Object obj) Adds an object at the head of the list.
protected Object	clone()
boolean	contains(Object obj)
List	copy()
String	dump()
Enumeration	elements()
Vector	getContents()
static void	main(String[] args)
Object	peek() Returns element at the tail (if present), but does not remove it from list.
Object	peekAtHead() Returns element at the head (if present), but does not remove it from list.
void	readExternal(ObjectInput in)
Object	remove() Removes an object from the tail of the list.
void	removeAll()
Object	removeElement(Object obj) Removes element `obj` from the list, checking for equality using the `equals` operator.
Object	removeFromHead() Removes an object from the head of the list.
int	size()
String	toString()
void	writeExternal(ObjectOutput out)

Field Detail

head

protected List.Element head

mutex

protected final transient Object mutex

size

protected int size

tail

protected List.Element tail

Constructor Detail

List

public List()

Method Detail

add

public void add(Object obj)

Adds an object at the tail of the list.

addAtHead

public void addAtHead(Object obj)

Adds an object at the head of the list.

clone

protected Object clone()

contains

public boolean contains(Object obj)

copy

public List copy()

dump

public String dump()

elements

public Enumeration elements()

getContents

public Vector getContents()

main

public static void main(String[] args)

peek

public Object peek()

Returns element at the tail (if present), but does not remove it from list.

peekAtHead

public Object peekAtHead()

Returns element at the head (if present), but does not remove it from list.

readExternal

public void readExternal(ObjectInput in)

remove

public Object remove()

Removes an object from the tail of the list. Returns null if no elements available

removeAll

public void removeAll()

removeElement

public Object removeElement(Object obj)

Removes element obj from the list, checking for equality using the equals operator. Only the first duplicate object is removed. Returns the removed object.

removeFromHead

public Object removeFromHead()

Removes an object from the head of the list. Returns null if no elements available

size

public int size()

toString

public String toString()

writeExternal

public void writeExternal(ObjectOutput out)