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/home/develito/www/administrator/components/com_abook/tables/tag.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( '_JEXEC' ) or die( 'Restricted access' );

class AbookTableTag extends JTable
{
	public function __construct(&$db)
        {
                parent::__construct('#__abtag', 'id', $db);
        }

function check()
        {
	/** check for valid name */
                if (trim($this->name) == '') {
                        $this->setError(JText::_('COM_ABOOK_WARNING_PROVIDE_VALID_NAME'));
                        return false;
                }

if (empty($this->alias)) {
                        $this->alias = $this->name;
                }
                $this->alias = JApplication::stringURLSafe($this->alias);
                if (trim(str_replace('-','',$this->alias)) == '') {
                        $this->alias = JFactory::getDate()->format("Y-m-d-H-i-s");
                }

if (!empty($this->metakey)) {
                        // only process if not empty
                        $bad_characters = array("\n", "\r", "\"", "<", ">"); // array of characters to remove
                        $after_clean = JString::str_ireplace($bad_characters, "", $this->metakey); // remove bad characters
                        $keys = explode(',', $after_clean); // create array using commas as delimiter
                        $clean_keys = array();
                        foreach($keys as $key) {
                                if (trim($key)) {  // ignore blank keywords
                                        $clean_keys[] = trim($key);
                                }
                        }
                        $this->metakey = implode(", ", $clean_keys); // put array back together delimited by ", "
                }

// clean up description -- eliminate quotes and <> brackets
                if (!empty($this->metadesc)) {
                        // only process if not empty
                        $bad_characters = array("\"", "<", ">");
                        $this->metadesc = JString::str_ireplace($bad_characters, "", $this->metadesc);
                }
                return true;
        }

public function delete($pk=null)
        {
                //check per impedire la cancellazione di un autore già utilizzato
                $query = 'SELECT * FROM #__abbooktag WHERE idtag = '.$pk;

$this->_db->setQuery($query);

$xid = $this->_db->loadResult();
                if (count($xid) > 0) {
                        JFactory::getApplication()->enqueueMessage(JText::_('COM_ABOOK_DELETE_NOT_ALLOWED_ITEM_ALREADY_USED_IN_A_BOOK'), 'warning');
                        return false;
                }

return parent::delete($pk);
        }
}