com.sun.jdo.spi.persistence.utility
Class DoubleLinkedList

java.lang.Object
  com.sun.jdo.spi.persistence.utility.DoubleLinkedList

public class DoubleLinkedList
extends Object

This class defines a thread-safe double linked-list. The list is usable by any class that implements the com.forte.util.Linkable interface. This class allows a linkable object it be inserted or removed from anywhere in the list. RESTRICTION: An object can only be a member of 1 list at a time.

Field Summary

Linkable	head Head of linked list.
int	size Size of linked list.
Linkable	tail Tail of linked list.

Constructor Summary

DoubleLinkedList()
Default constructor.

Method Summary

Linkable	getHead() Return the object at the head of a linked list.
int	getSize() Return size of the linked list.
Linkable	getTail() Return the object at the tail of a linked list.
void	insertAtHead(Linkable node) Insert an object at the head of a linked list.
void	insertAtTail(Linkable node) Insert an object at the tail of a linked list.
void	insertIntoList(Linkable afternode, Linkable newnode) Insert an object anywhere into the linked list.
Linkable	removeFromHead() Remove and return an object from the head of a linked list.
void	removeFromList(Linkable node) Remove the specified object from anywhere in the linked list.
Linkable	removeFromTail() Remove and return an object from the tail of a linked list.
String	toString() Return a string representation of this DoubleLinkedList object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

head

public Linkable head

Head of linked list.

tail

public Linkable tail

Tail of linked list.

size

public int size

Size of linked list.

Constructor Detail

DoubleLinkedList

public DoubleLinkedList()

Default constructor.

Method Detail

getHead

public Linkable getHead()

Return the object at the head of a linked list.

getTail

public Linkable getTail()

Return the object at the tail of a linked list.

getSize

public int getSize()

Return size of the linked list.

insertAtHead

public void insertAtHead(Linkable node)

Insert an object at the head of a linked list.

insertAtTail

public void insertAtTail(Linkable node)

Insert an object at the tail of a linked list.

removeFromHead

public Linkable removeFromHead()

Remove and return an object from the head of a linked list.

removeFromTail

public Linkable removeFromTail()

Remove and return an object from the tail of a linked list.

removeFromList

public void removeFromList(Linkable node)

Remove the specified object from anywhere in the linked list. This method is usually used by the object to remove itself from the list.

insertIntoList

public void insertIntoList(Linkable afternode,
                           Linkable newnode)

Insert an object anywhere into the linked list.

Parameters:

afternode - the new node will be inserted after this node

newnode - the new node to be inserted

toString

public String toString()

Return a string representation of this DoubleLinkedList object.

Overrides:

toString in class Object

Returns:

String representation of this object.