<?php
namespace Resource\Collection;
use Resource\Native\Objective;
use Resource\Native\Object;
use Resource\Native\String;
use Resource\Exception\UnsupportedOperationException;
/**
* The abstract Collection Class, extending from the root Object Class and implements Collective Interface.
* It is parent to all Collection objects, subclasses have access to all its defined methods.
* @category Resource
* @package Collection
* @author Hall of Famer
* @copyright Mysidia Adoptables Script
* @link http://www.mysidiaadoptables.com
* @since 1.3.4
* @todo Not much at this point.
* @abstract
*
*/
abstract class Collection extends Object implements Collective{
/**
* The add method, append an object to the end of the collection.
* The method is disabled in abstract collection class, thus child class must implement its own version of add method.
* @param Objective $object
* @access public
* @return Boolean
*/
public function add(Objective $object){
throw new UnsupportedOperationException;
}
/**
* The addAll method, append a collection of objects to the end of the Collection.
* @param Collective $collection
* @access public
* @return Boolean
*/
public function addAll(Collective $collection){
$added = FALSE;
foreach($collection as $object){
if($this->add($object)) $added = TRUE;
}
return $added;
}
/**
* The clear method, drops all objects currently stored in Collection.
* @access public
* @return Void
*/
public function clear(){
$iterator = $this->iterator();
while($iterator->hasNext()){
$iterator->next();
$iterator->remove();
}
}
/**
* The contains method, checks if a given object is already on the Collection.
* @param Objective $object
* @access public
* @return Boolean
*/
public function contains(Objective $object){
$iterator = $this->iterator();
while($iterator->hasNext()){
if($object->equals($iterator->next())) return TRUE;
}
return FALSE;
}
/**
* The containsAll method, checks if a collection of objects are all available on the Collection.
* @param Collective $collection
* @access public
* @return Boolean
*/
public function containsAll(Collective $collection){
foreach($collection as $object){
if(!$this->contains($object)) return FALSE;
}
return TRUE;
}
/**
* The count method, alias to the size() method.
* @access public
* @return Int
*/
public function count(){
return $this->size();
}
/**
* The getIterator method, alias to the iterator() method.
* @access public
* @return Iterator
*/
public function getIterator(){
return $this->iterator();
}
/**
* The hashCode method, returns the hash code for this collection.
* The method is disabled in abstract collection class, thus child class must implement its own version of hashCode method.
* @access public
* @return String
*/
public function hashCode(){
return NULL;
}
/**
* The isEmpty method, checks if the collection is empty or not.
* @access public
* @return Boolean
*/
public function isEmpty(){
return ($this->size() == 0);
}
/**
* The remove method, removes a supplied Object from this collection.
* @param Objective $object
* @access public
* @return Boolean
*/
public function remove(Objective $object){
$iterator = $this->iterator();
while($iterator->hasNext()){
if($object->equals($iterator->next())){
$iterator->remove();
return TRUE;
}
}
return FALSE;
}
/**
* The removeAll method, removes a collection of objects from this collection.
* @param Collective $collection
* @access public
* @return Boolean
*/
public function removeAll(Collective $collection){
$removed = FALSE;
$iterator = $this->iterator();
while($iterator->hasNext()){
if($collection->contains($iterator->next())){
$iterator->remove();
$removed = TRUE;
}
}
return $removed;
}
/**
* The removeAll method, removes everything but the given collection of objects from this collection.
* @param Collective $collection
* @access public
* @return Boolean
*/
public function retainAll(Collective $collection){
$retained = FALSE;
$iterator = $this->iterator();
while($iterator->hasNext()){
if(!$collection->contains($iterator->next())){
$iterator->remove();
$retained = TRUE;
}
}
return $retained;
}
/**
* The toArray method, acquires an array copy of the objects stored in the collection.
* @access public
* @return Array
*/
public function toArray(){
$iterator = $this->iterator();
$size = $iterator->size();
$array = array();
for($i = 0; $i < $size; $i++){
$array[$i] = $iterator->next();
}
return $array;
}
/**
* The magic method __toString, defines the string expression of the collection.
* @access public
* @return String
*/
public function __toString(){
$iterator = $this->iterator();
if(!$iterator->valid()) return new String("[]");
$stringBuilder = new String("[");
while($iterator->hasNext()){
$object = $iterator->next();
$stringBuilder->add(($object == $this) ? "(this collection)" : $object);
if(!$iterator->hasNext()) {
$stringBuilder->add("]");
return $stringBuilder;
}
$stringBuilder->add(", ");
}
}
/**
* The abstract size method, must be implemented by child class.
* @access public
* @return Int
* @abstract
*/
/**
* The abstract iterator method, must be implemented by child class.
* @access public
* @return Iterator
* @abstract
*/
}
?>
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