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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Form
 *
 * @copyright   Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

jimport('joomla.form.formrule');

/**
 * Form Rule class for the Joomla Framework.
 *
 * @package     Joomla.Platform
 * @subpackage  Form
 * @since       11.1
 */
class JFormRuleUsername extends JFormRule
{
	/**
	 * Method to test the username for uniqueness.
	 *
	 * @param   object  $element    The JXMLElement object representing the <field /> tag for the
	 *                              form field object.
	 * @param   mixed   $value      The form field value to validate.
	 * @param   string  $group      The field name group control value. This acts as as an array
	 *                              container for the field. For example if the field has name="foo"
	 *                              and the group value is set to "bar" then the full field name
	 *                              would end up being "bar[foo]".
	 * @param   object  $input      An optional JRegistry object with the entire data set to validate
	 *                              against the entire form.
	 * @param   object  $form       The form object for which the field is being tested.
	 *
	 * @return  boolean  True if the value is valid, false otherwise.
	 *
	 * @since   11.1
	 * @throws  JException on invalid rule.
	 */
	public function test(& $element, $value, $group = null, & $input = null, & $form = null)
	{
		// Get the database object and a new query object.
		$db		= JFactory::getDBO();
		$query	= $db->getQuery(true);

// Build the query.
		$query->select('COUNT(*)');
		$query->from('#__users');
		$query->where('username = '.$db->quote($value));

// Get the extra field check attribute.
		$userId = ($form instanceof JForm) ? $form->getValue('id') : '';
		$query->where($db->quoteName('id').' <> '.(int) $userId);

// Set and query the database.
		$db->setQuery($query);
		$duplicate = (bool) $db->loadResult();

// Check for a database error.
		if ($db->getErrorNum()) {
			JError::raiseWarning(500, $db->getErrorMsg());
		}

if ($duplicate) {
			return false;
		}

return true;
	}
}