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/home/develito/public_html/components/com_abook/models/authors.php

<?php
/**
 * @package Joomla
 * @subpackage Abook
 * @copyright (C) 2010-2019 Federica Ugolotti
 * @license GNU/GPL, see LICENSE.php
 * Abook is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License 3
 * as published by the Free Software Foundation.

* Abook is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

* You should have received a copy of the GNU General Public License
 * along with Abook; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
// No direct access
defined('_JEXEC') or die;

jimport('joomla.application.component.modellist');
jimport('joomla.application.categories');

class AbookModelAuthors extends JModelList
{
	protected $_item = null;

/**
	 * Method to get a list of items.
	 *
	 * @return	mixed	An array of objects on success, false on failure.
	 */

protected function getListQuery()
	{
		$params = $this->getState()->get('params');

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

// Select required fields from the categories.
		$query->select($this->getState('list.select', 'a.*'));
		$query->from('#__abauthor AS a');

if ($this->state->params->get('author_name_display', 0) == 1){
                        $query->select('CONCAT(a.name, " ", a.lastname) AS name');
                }else{
                        $query->select('CONCAT(a.lastname, " ", a.name) AS name');
                }
		
		// Filter by language
		if ($this->getState('filter.language')) {
			$query->where('a.language in (' . $db->Quote(JFactory::getLanguage()->getTag()) . ',' . $db->Quote('*') . ')');
		}

// Add the list ordering clause.
//		$query->order($db->escape($this->getState('list.ordering', 'a.ordering')).' '.$db->escape($this->getState('list.direction', 'ASC')));

if ($this->getState('filter.letter')) {
			$query->where("a.lastname REGEXP '^".$db->escape($this->getState('filter.letter'))."'");
		}
		if ($this->getState('filter.keyword') !='') {
			$query->where('LOWER( a.name ) LIKE "%'.$db->escape($this->getState('filter.keyword')).'%"');
		}

if ($this->getState('list.ordering') !='') {
                        $query->order($db->escape($this->getState('list.ordering')). ' '.$db->escape($this->getState('list.direction')));
                }
		return $query;
	}

protected function populateState($ordering = null, $direction = null)
	{
		// Initialise variables.
		$app    = JFactory::getApplication('site');
		$jinput = JFactory::getApplication()->input;
		$itemid = $app->input->get('id', 0, 'int') . ':' . $app->input->get('Itemid', 0, 'int');
                // Load the parameters. Merge Global and Menu Item params into new object
                $params = $app->getParams();
                $menuParams = new JRegistry;

if ($menu = $app->getMenu()->getActive()) {
                        $menuParams->loadString($menu->params);
                }
                $mergedParams = clone $menuParams;
                $mergedParams->merge($params);
		// Load the parameters.
                $this->setState('params', $mergedParams);

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

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

$orderCol	= $app->input->getCmd('filter_order', $params->get('author_display_order','lastname'));
		$this->setState('list.ordering', $orderCol);

$listOrder	=  $app->input->getCmd('filter_order_Dir', $params->get('author_display_order_dir','ASC'));
		$this->setState('list.direction', $listOrder);

$this->setState('filter.language',$app->getLanguageFilter());
		$showSubcategories = $params->get('show_subcategory_book', '1');

$letter      =$jinput->get('letter', '', 'WORD');
                $this->setState('filter.letter', $letter);

$this->setState('filter.keyword', $app->input->getString('filter-keyword'));
		$author=$app->getUserStateFromRequest('abook.category.list.' . $itemid . '.author', 'filter-author_id', $app->input->getInt('filter-author_id'));
	}
}