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## org.apache.batik.util
Class DoublyLinkedList

    java.lang.Object
      org.apache.batik.util.DoublyLinkedList

public class DoublyLinkedList
extends java.lang.Object

A simple Doubly Linked list class, designed to avoid O(n) behaviour on insert and delete.

Nested Class Summary
`static class` | `DoublyLinkedList.Node` Basic doubly linked list node interface.

Constructor Summary
`DoublyLinkedList()`

Method Summary
`void` | `add(DoublyLinkedList.Node nde)` Adds `nde` to the head of the list.
`void` | `add(int index, DoublyLinkedList.Node nde)`
`void` | `empty()` Removes all elements from the list.
`DoublyLinkedList.Node` | `getHead()` Get the current head element
`int` | `getSize()` Returns the number of elements currently in the list.
`DoublyLinkedList.Node` | `getTail()` Get the current tail element
`DoublyLinkedList.Node` | `pop()` Removes 'head' from list and returns it.
`void` | `push(DoublyLinkedList.Node nde)` Adds `nde` to tail of list
`void` | `remove(DoublyLinkedList.Node nde)` Removes nde from the list it is part of (should be this one, otherwise results are undefined).
`void` | `touch(DoublyLinkedList.Node nde)` Moves `nde` to the head of the list (equivilent to remove(nde); add(nde); but faster.
`void` | `unpop(DoublyLinkedList.Node nde)` Adds `nde` to head of list
`DoublyLinkedList.Node` | `unpush()` Removes 'tail' from list and returns it.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DoublyLinkedList

    public DoublyLinkedList()

Method Detail

### getSize

    public int getSize()

  Returns the number of elements currently in the list.

### empty

    public void empty()

  Removes all elements from the list.

### getHead

    public DoublyLinkedList.Node getHead()

  Get the current head element

  Returns:
    The current 'first' element in list.

### getTail

    public DoublyLinkedList.Node getTail()

  Get the current tail element

  Returns:
    The current 'last' element in list.

### touch

    public void touch(DoublyLinkedList.Node nde)

  Moves `nde` to the head of the list (equivilent to remove(nde); add(nde); but faster.

### add

    public void add(int index,
                    DoublyLinkedList.Node nde)

### add

    public void add(DoublyLinkedList.Node nde)

  Adds `nde` to the head of the list. In perl this is called an 'unpop'. `nde` should not currently be part of any list.

  Parameters:
    `nde` - the node to add to the list.

### remove

    public void remove(DoublyLinkedList.Node nde)

  Removes nde from the list it is part of (should be this one, otherwise results are undefined). If nde is the current head element, then the next element becomes head, if there are no more elements the list becomes empty.

  Parameters:
    `nde` - node to remove.

### pop

    public DoublyLinkedList.Node pop()

  Removes 'head' from list and returns it. Returns null if list is empty.

### unpush

    public DoublyLinkedList.Node unpush()

  Removes 'tail' from list and returns it. Returns null if list is empty.

### push

    public void push(DoublyLinkedList.Node nde)

  Adds `nde` to tail of list

### unpop

    public void unpop(DoublyLinkedList.Node nde)

  Adds `nde` to head of list

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Copyright © 2004 Apache Software Foundation. All Rights Reserved.