khanat-opennel-code/code/web/app/app_achievements/class/DLL_class.php

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2013-07-24 18:58:43 +00:00
<?php
/*
* Doubly Linked List
*
* This list is linked to an avl tree for searching purpose!
*/
class DLL {
private $first;
private $last;
private $size;
private $avl;
function DLL() {
$this->avl = new AVLTree();
$this->first = null;
$this->last = null;
$this->size = 0;
}
function getIterator() {
return new NodeIterator($this->first);
}
final function getSize() {
return $this->size;
}
final function isEmpty() {
return ($this->size == 0);
}
function getFirst() {
return $this->first;
}
function getLast() {
return $this->last;
}
function addNode($data,$before = null) { // add a node
if($this->findNode($data->getID()) != null) {
return false;
}
$n = new DLLnode($data);
if($before == null) {
//insert as last
if($this->last != null) {
$this->last->setChild($n);
}
$n->setParent($this->last);
$this->last = $n;
}
else {
//insert before
$b = $this->findNode($before);
if($b != null) {
if($b == $this->first) {
$this->first = $n;
}
$tmp = $b->getParent();
$b->setParent($n);
$n->setChild($b);
if($tmp != null) {
$tmp->setChild($n);
}
}
else {
$this->addNode($data);
return null;
}
}
if($this->first == null) {
$this->first = $n;
}
$this->avl->insert($n); // pass on to avl tree
$this->size++;
return null;
}
function removeNode($id) { // remove a node
#$this->avl->inorder();
$n = $this->findNode($id);
if($n != null) {
$p = $n->getParent();
$c = $n->getChild();
if($c != null) {
$c->setParent($p);
if($p != null) {
$p->setChild($c);
}
}
else {
if($p != null) {
$p->setChild(null);
}
$this->last = $p;
}
if($p == null) {
if($c != null) {
$c->setParent(null);
$this->first = $c;
}
else {
$this->first = null;
}
}
$this->avl->remove($id); // pass on to avl tree
$this->size--;
}
}
function findNode($id) {
return $this->avl->find($id);
}
}
/*
* List nodes
*/
class DLLnode {
private $parent;
private $child;
public $data;
function DLLNode($d) {
$this->parent = null;
$this->child = null;
$this->data = $d; // actual data
}
final function getParent() {
return $this->parent;
}
final function setParent($p) {
$this->parent = $p;
}
final function getChild() {
return $this->child;
}
final function setChild($c) {
$this->child = $c;
}
final function getIterator() {
return new NodeIterator($this);
}
function getID() {
return $this->data->getID();
}
}
?>