<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Sales
 * @copyright   Copyright (c) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Flat sales order payment collection
 *
 */
class Mage_Sales_Model_Mysql4_Order_Item_Collection extends Mage_Sales_Model_Mysql4_Order_Collection_Abstract
{
    protected $_eventPrefix = 'sales_order_item_collection';
    protected $_eventObject = 'order_item_collection';
    
    /**
	 * Order field for setOrderFilter
	 * 
	 * @var string
	 */
	protected $_orderField = 'order_id';

    protected function _construct()
    {
        $this->_init('sales/order_item');
    }

    /**
     * Assign parent items on after collection load
     *
     * @return Mage_Sales_Model_Mysql4_Order_Item_Collection
     */
    protected function _afterLoad()
    {
        parent::_afterLoad();
        /**
         * Assign parent items
         */
        foreach ($this as $item) {
            if ($item->getParentItemId()) {
                $item->setParentItem($this->getItemById($item->getParentItemId()));
            }
        }
        return $this;
    }

    /**
     * Set random items order
     *
     * @return Mage_Sales_Model_Mysql4_Order_Item_Collection
     */
    public function setRandomOrder()
    {
        $this->setOrder('RAND()');
        return $this;
    }

    /**
     * Set filter by item id
     *
     * @param mixed $item
     * @return Mage_Sales_Model_Mysql4_Order_Item_Collection
     */
    public function addIdFilter($item)
    {
        if (is_array($item)) {
            $this->addFieldToFilter('item_id', array('in'=>$item));
        } elseif ($item instanceof Mage_Sales_Model_Order_Item) {
            $this->addFieldToFilter('item_id', $item->getId());
        } else {
            $this->addFieldToFilter('item_id', $item);
        }
        return $this;
    }

    /**
     * Filter collection by specified product types
     *
     * @param array $typeIds
     * @return Mage_Sales_Model_Mysql4_Order_Item_Collection
     */
    public function filterByTypes($typeIds)
    {
        $this->addFieldToFilter('product_type', array('in' => $typeIds));
        return $this;
    }

    /**
     * Filter collection by parent_item_id
     *
     * @param int $parentId
     * @return Mage_Sales_Model_Mysql4_Order_Item_Collection
     */
    public function filterByParent($parentId = null)
    {
        if (empty($parentId)) {
            $this->addFieldToFilter('parent_item_id', array('null' => true));
        }
        else {
            $this->addFieldToFilter('parent_item_id', $parentId);
        }
        return $this;
    }
}