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/home/develito/httpdocs/components/com_abook/models/fields/year.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.
 */
defined('JPATH_BASE') or die;

jimport('joomla.html.html');
jimport('joomla.form.formfield');
jimport('joomla.form.helper');
JFormHelper::loadFieldClass('list');

class JFormFieldYear extends JFormFieldList
{
        /**
         * The form field type.
         *
         * @var         string
         * @since       1.6
         */
        protected $type = 'Year';

/**
         * Method to get the field options.
         *
         * @return      array   The field option objects.
         * @since       1.6
         */
        public function getOptions()
        {
                // Initialize variables.
                $options = array();

$db             = JFactory::getDbo();
                $query  = $db->getQuery(true);

$query->select('DISTINCT b.year AS value, b.year AS text');
                $query->from('#__abcategories AS c');
                $query->leftjoin('#__abbook AS b ON b.catid=c.id');
                $query->where('b.year > 0');

$app = JFactory::getApplication();
		$params = $app->getParams();
		if ($params->get('id')){
			$subQuery = $db->getQuery(true);
                        $subQuery->select('sub.id');
                        $subQuery->from('#__abcategories as sub');
                        $subQuery->join('INNER', '#__abcategories as this ON sub.lft > this.lft AND sub.rgt < this.rgt');
                        $subQuery->where('this.id = '.(int) $params->get('id'));
                        if ($params->get('maxLevel') >= 0) {
 	                       $subQuery->where('sub.level <= this.level + '.$params->get('maxLevel'));
                        }
                                // Add the subquery to the main query
                                $query->where('(b.catid ='.$params->get('id').' OR b.catid IN ('.$subQuery->__toString().'))');
		}
		$query->order('b.year');
                // Get the options.
                $db->setQuery($query);
		try
                {
                        $options = $db->loadObjectList();
                }
                catch (RuntimeException $e)
                {
                        JFactory::getApplication()->enqueueMessage($e->getMessage(), 'error');
                }

// Merge any additional options in the XML definition.
                $options = array_merge(parent::getOptions(), $options);

return $options;
        }
}