Class DoublyLinkedList

java.lang.Object
org.apache.batik.util.DoublyLinkedList
public class DoublyLinkedList extends Object
A simple Doubly Linked list class, designed to avoid O(n) behaviour on insert and delete.

  • Constructor Details

    • DoublyLinkedList

      public DoublyLinkedList()

  • Method Details

    • 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.
      Returns:
      current head element, next element becomes head.

    • unpush

      public DoublyLinkedList.Node unpush()
      Removes 'tail' from list and returns it. Returns null if list is empty.
      Returns:
      current tail element.

    • 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