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/home/develito/httpdocs/modules/mod_weblinklogo/fields/sywlibtest.php

<?php
/**
 * @copyright	Copyright (C) 2011 Simplify Your Web, Inc. All rights reserved.
 * @license		GNU General Public License version 3 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Form\FormField;
use Joomla\CMS\Language\Text;

jimport('joomla.filesystem.folder');

/*
 * Checks if the SYW library is installed and has the version needed for the extension to run properly
 */
class JFormFieldSYWlibtest extends FormField
{
    public $type = 'SYWlibtest';

protected $minversion;
    protected $downloadlink;

protected function getLabel()
    {
        return '';
    }

protected function getInput()
    {
        $html = '';

if (!\JFolder::exists(JPATH_ROOT.'/libraries/syw')) {
            $html .= '<div class="alert alert-warning">';
            $html .= '<span>'.Text::_('SYW_MISSING_SYWLIBRARY').'</span><br />';
            $html .= '<a href="'.$this->downloadlink.'" target="_blank">'.Text::_('SYW_DOWNLOAD_SYWLIBRARY').'</a>';
            $html .= '</div>';
        } else {
            \JLoader::register('SYWVersion', JPATH_LIBRARIES.'/syw/version.php');
            if (!SYWVersion::isCompatible($this->minversion)) {
                $html .= '<div class="alert alert-warning">';
                $html .= '<span>'.Text::_('SYW_NONCOMPATIBLE_SYWLIBRARY').'</span><br />';
                $html .= '<span>'.Text::_('SYW_UPDATE_SYWLIBRARY').' '.Text::_('SYW_OR').' </span>';
                $html .= '<a href="'.$this->downloadlink.'" target="_blank">'.strtolower(Text::_('SYW_DOWNLOAD_SYWLIBRARY')).'</a>';
                $html .= '</div>';
            }
        }

return $html;
    }

public function renderField($options = array())
    {
        if (!\JFolder::exists(JPATH_ROOT.'/libraries/syw')) {
            return parent::renderField();
        } else {
            \JLoader::register('SYWVersion', JPATH_LIBRARIES.'/syw/version.php');
            if (!SYWVersion::isCompatible($this->minversion)) {
                return parent::renderField();
            }
        }

return '';
    }

public function setup(\SimpleXMLElement $element, $value, $group = null)
    {
        $return = parent::setup($element, $value, $group);

if ($return) {
            $this->minversion = $this->element['minversion'];
            $this->downloadlink = $this->element['downloadlink'];
        }

return $return;
    }

}
?>