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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* No student indicator.
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*
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* @package core_course
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* @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core_course\analytics\indicator;
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defined('MOODLE_INTERNAL') || die();
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/**
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* No student indicator.
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*
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* @package core_course
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* @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class no_student extends \core_analytics\local\indicator\binary {
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/**
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* Student role ids.
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*
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* @var array|null
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*/
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protected $studentroleids = null;
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/**
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* Returns the name.
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*
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* If there is a corresponding '_help' string this will be shown as well.
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*
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* @return \lang_string
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*/
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public static function get_name(): \lang_string {
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return new \lang_string('indicator:nostudent', 'moodle');
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}
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/**
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* required_sample_data
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*
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* @return string[]
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*/
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public static function required_sample_data() {
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// We require course because, although calculate_sample only reads context, we need the context to be course
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// or below.
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return array('context', 'course');
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}
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/**
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* calculate_sample
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*
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* @param int $sampleid
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* @param string $sampleorigin
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* @param int|false $notusedstarttime
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* @param int|false $notusedendtime
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* @return float
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*/
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public function calculate_sample($sampleid, $sampleorigin, $notusedstarttime = false, $notusedendtime = false) {
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$context = $this->retrieve('context', $sampleid);
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if (is_null($this->studentroleids)) {
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$this->studentroleids = array_keys(get_archetype_roles('student'));
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}
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foreach ($this->studentroleids as $role) {
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// We look for roles, not enrolments as a student assigned at category level is supposed to be a
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// course student.
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$students = get_role_users($role, $context, false, 'u.id', 'u.id');
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if ($students) {
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return self::get_max_value();
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}
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}
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return self::get_min_value();
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}
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}
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