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/home/develito/httpdocs/components/com_abook/models/categories.php

<?php
/**
 * @package Joomla
 * @subpackage Abook
 * @copyright (C) 2010-2019 Federica Ugolotti
 * @copyright	Copyright (C) 2005 - 2010 Open Source Matters, Inc. All rights reserved.
 * @license		GNU General Public License 3 or later; see LICENSE.txt
 */

// Check to ensure this file is included in Joomla!
defined('_JEXEC') or die;

jimport('joomla.application.component.modellist');
jimport('joomla.application.categories');
JHtml::addIncludePath(JPATH_COMPONENT.DIRECTORY_SEPARATOR.'helpers/categories.php');
use Joomla\Registry\Registry;

class AbookModelCategories extends JModelList
{
	public $_context = 'com_abook.categories';

protected $_extension = 'com_abook';

private $_parent = null;

protected function populateState($ordering = null, $direction = null)
	{
		$app = JFactory::getApplication();
		$this->setState('filter.extension', $this->_extension);

// Get the parent id if defined.
		$parentId = $app->input->getInt('id'); 
		$this->setState('id', $parentId);

$params = $app->getParams();

$menuParams = new JRegistry;

if ($menu = $app->getMenu()->getActive()) {
                        $menuParams->loadString($menu->params);
                }
                $mergedParams = clone $menuParams;
                $mergedParams->merge($params);

$this->setState('params', $mergedParams);
		// List state information
                $limit = $app->getUserStateFromRequest('abook.categories.list.limit', 'limit', $params->get('display_num'));
                $this->setState('list.limit', $limit);

$limitstart = $app->input->get('limitstart', 0, 'uint');
                $this->setState('list.start', $limitstart);

$this->setState('filter.published',	1);
		$this->setState('filter.access',	true);
	}

protected function getStoreId($id = '')
	{
		// Compile the store id.
		$id	.= ':'.$this->getState('filter.extension');
		$id	.= ':'.$this->getState('filter.published');
		$id	.= ':'.$this->getState('filter.access');
		$id	.= ':'.$this->getState('filter.parentId');

return parent::getStoreId($id);
	}

protected function getListQuery()
        {
		$params = $this->getState()->get('params');
                $user   = JFactory::getUser();
                $groups = implode(',', $user->getAuthorisedViewLevels());
		$app = JFactory::getApplication();

// Create a new query object.
                $db = $this->getDbo();
                $query = $db->getQuery(true);

// Select the required fields from the table.
                $query->select('c.*');
		$query->select('CASE WHEN '.$query->charLength('c.alias', '!=', '0').' THEN '.$query->concatenate(array('c.id', 'c.alias'), ':'). ' ELSE c.id END as slug');
                $query->from('#__abcategories AS c');

$query->select('u.name AS owner');
                $query->join('LEFT', '#__users AS u ON u.id = c.checked_out');

$query->select('ag.title AS access_level');
                $query->leftjoin('#__viewlevels AS ag ON ag.id = c.access');

$level = $params->get('maxLevel', '-1');
		if ($this->getState('id') != '0') {
			$query->where('s.id=' . (int) $this->getState('id'));
			if ($app->isSite() && $app->getLanguageFilter()){
				$query->leftJoin('#__abcategories AS s ON (s.lft < c.lft AND s.rgt >= c.rgt AND c.language in (' . $db->Quote(JFactory::getLanguage()->getTag()) . ',' . $db->Quote('*') . '))');
			}else {
				$query->leftJoin('#__abcategories AS s ON (s.lft < c.lft AND s.rgt >= c.rgt)');
                        }
			if ($level > 0) {
                        	$query->where('c.level <= s.level + '.(int) $level);
                	}	
		}else{
//			$query->leftJoin('#__categories AS s ON (s.lft <= c.lft AND s.rgt >= c.rgt) OR (s.lft >= c.lft AND s.rgt <= c.rgt)');
			if ($app->isSite() && $app->getLanguageFilter())
                        {
                                $query->where('c.language in (' . $db->Quote(JFactory::getLanguage()->getTag()) . ',' . $db->Quote('*') . ')');
                        }
			if ($level > 0) {
                        	$query->where('c.level <= '.(int) $level);	
                	}
		}

if ($params->get('show_item_count', 0) == 1 || $params->get('show_empty_categories', 1)== 0)
                {
                        $query->leftJoin(
                        	'#__abbook AS i ON i.catid = c.id AND i.state = 1 AND i.language in (' . $db->Quote(JFactory::getLanguage()->getTag()) . ',' . $db->Quote('*') . ')'
                        );
                        $query->select('COUNT(DISTINCT i.id) AS numitems');
			if ($params->get('show_empty_categories', 1)== 0){
				$query->leftJoin('#__abcategories AS n ON n.parent_id=c.id');
				$query->select('COUNT(DISTINCT n.id) AS numchildren');
				$query->having('(numchildren + numitems) > 0');
			}
                }

//		$subQuery = ' (SELECT cat.id as id FROM #__abcategories AS cat JOIN #__abcategories AS parent ' .
//                        'ON cat.lft BETWEEN parent.lft AND parent.rgt WHERE parent.extension = ' . $db->quote($extension) .
//                        ' AND parent.published != 1 GROUP BY cat.id) ';
//                $query->leftJoin($subQuery . 'AS badcats ON badcats.id = c.id');
//                $query->where('badcats.id is null');

// Filter by extension
                $query->where("c.extension = 'com_abook'");

$query->where('c.published =1');

// Filter by access level.
		$query->where('c.access IN ('.$groups.')');

if ($language = $this->getState('filter.language')) {
                        $query->where('c.language IN ( '.$db->Quote(JFactory::getLanguage()->getTag()) . ',' . $db->Quote('*').')');
                }
		$order=$params->get('cat_display_order')=='ordering'?'lft':$params->get('cat_display_order', 'lft');
                //$query->order('c.lft, c.level ASC, c.parent_id ASC, c.'.$params->get('cat_display_order', 'title').' '.$params->get('cat_display_order_dir', 'ASC'));
		$query->order('c.'.$order.' '.$params->get('cat_display_order_dir', 'ASC').', c.lft, c.level');
//provare anche questo che ho messo da centroeinaudi
//$query->order($params->get('cat_display_order', 'title').' '.$params->get('cat_display_order_dir', 'ASC').', c.lft, c.level ASC, c.parent_id ASC');

$query->group('c.id, c.language, c.level, c.lft, c.parent_id, c.path, c.rgt');
                return $query;
        }

/*
	function _children($catid)
        {
                $query='SELECT COUNT(*)'
                        .' FROM #__abcategories'
                        .' WHERE parent_id='. (int) $catid;
                $this->_db->setQuery($query);
                $this->_children = $this->_db->loadResult();
echo $query;
                return $this->_children;
        }
*/
/*
        public function getItems($recursive = false)
        {
                $store = $this->getStoreId();

if (!isset($this->cache[$store]))
                {
                        $app = JFactory::getApplication();
                        $menu = $app->getMenu();
                        $active = $menu->getActive();
                        $params = new Registry;

if ($active)
                        {
                                $params->loadString($active->params);
                        }

$options = array();
                        $options['countItems'] = $params->get('show_item_count', 1) || !$params->get('show_empty_categories', 0);
                        $categories = JCategories::getInstance('Abook', $options);
                        $this->_parent = $categories->get($this->getState('filter.parentId', 'root'));

if (is_object($this->_parent))
                        {
                                $this->cache[$store] = $this->_parent->getChildren($recursive);
                        }
                        else
                        {
                                $this->cache[$store] = false;
                        }
                }

return $this->cache[$store];
        }
*/
	public function getParent()
	{
		if(!isset($this->_parent)){
			$db = $this->getDbo();
	                $query = $db->getQuery(true);
			$query->select('*');
			$query->from('#__abcategories');
			$query->where('parent_id ='.$this->getState('id'));
			$db->setQuery($query);
                        $this->_parent = $db->loadObjectList();
			
		}
		return $this->_parent;
	}
        public function getThiscategory()
        {
		if ($this->getState('id')==0){
			$this->_thiscategory=null;
		}else if(!isset($this->_thiscategory)){
                        $db = $this->getDbo();
                        $query = $db->getQuery(true);
                        $query->select('*');
                        $query->from('#__abcategories');
                        $query->where('id ='.$this->getState('id'));
                        $db->setQuery($query);
                        $this->_thiscategory = $db->loadObject();
                }
                return $this->_thiscategory;
        }
/*
        public function getParent()
        {
                if (!is_object($this->_parent))
                {
                        $this->getItems();
                }

return $this->_parent;
        }
*/

//ho messo questa funzione per cercare di sovrascrivere quella originale e aggiungere l'ordinamento ma non funziona. 14/08/2011
	function &getChildren()
        {
                if(!is_object($this->_items)){
                        $this->getCategory();
                }
                // Order subcategories
                if (sizeof($this->_children)) {
                        $params = $this->getState()->get('params');
                        if ($params->get('cat_display_order') == 'title' || $params->get('cat_display_order') == 'rtitle') {
                                jimport('joomla.utilities.arrayhelper');
                                JArrayHelper::sortObjects($this->_children, $params->get('cat_display_order'), ($params->get('cat_display_order') == 'title') ? 1 : -1);
                        }
		}
                return $this->_children;
        }
}