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libraries/joomla/form/rule/username.php

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+<?php
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ *
+ * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE
+ */
+
+defined('JPATH_PLATFORM') or die;
+
+/**
+ * Form Rule class for the Joomla Platform.
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ * @since       11.1
+ */
+class JFormRuleUsername extends JFormRule
+{
+	/**
+	 * Method to test the username for uniqueness.
+	 *
+	 * @param   SimpleXMLElement  $element  The SimpleXMLElement 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   JRegistry         $input    An optional JRegistry object with the entire data set to validate against the entire form.
+	 * @param   JForm             $form     The form object for which the field is being tested.
+	 *
+	 * @return  boolean  True if the value is valid, false otherwise.
+	 *
+	 * @since   11.1
+	 */
+	public function test(SimpleXMLElement $element, $value, $group = null, JRegistry $input = null, JForm $form = null)
+	{
+		// Get the database object and a new query object.
+		$db = JFactory::getDbo();
+		$query = $db->getQuery(true);
+
+		// Build the query.
+		$query->select('COUNT(*)')
+			->from('#__users')
+			->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) $db->loadResult();
+
+		if ($duplicate)
+		{
+			return false;
+		}
+
+		return true;
+	}
+}