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<?php // This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>. /** * Class for loading/storing competency frameworks from the DB. * * @package core_competency * @copyright 2015 Damyon Wiese * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ namespace core_competency; defined('MOODLE_INTERNAL') || die(); use coding_exception; use context; use lang_string; use stdClass; require_once($CFG->libdir . '/grade/grade_scale.php'); /** * Class for loading/storing competency frameworks from the DB. * * @copyright 2015 Damyon Wiese * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class competency_framework extends persistent { const TABLE = 'competency_framework'; /** Taxonomy constant. */ const TAXONOMY_BEHAVIOUR = 'behaviour'; /** Taxonomy constant. */ const TAXONOMY_COMPETENCY = 'competency'; /** Taxonomy constant. */ const TAXONOMY_CONCEPT = 'concept'; /** Taxonomy constant. */ const TAXONOMY_DOMAIN = 'domain'; /** Taxonomy constant. */ const TAXONOMY_INDICATOR = 'indicator'; /** Taxonomy constant. */ const TAXONOMY_LEVEL = 'level'; /** Taxonomy constant. */ const TAXONOMY_OUTCOME = 'outcome'; /** Taxonomy constant. */ const TAXONOMY_PRACTICE = 'practice'; /** Taxonomy constant. */ const TAXONOMY_PROFICIENCY = 'proficiency'; /** Taxonomy constant. */ const TAXONOMY_SKILL = 'skill'; /** Taxonomy constant. */ const TAXONOMY_VALUE = 'value'; /** @var static The object before it was updated. */ protected $beforeupdate; /** * Get the context. * * @return context The context */ public function get_context() { return context::instance_by_id($this->get('contextid')); } /** * Return the definition of the properties of this model. * * @return array */ protected static function define_properties() { return array( 'shortname' => array( 'type' => PARAM_TEXT ), 'idnumber' => array( 'type' => PARAM_RAW ), 'description' => array( 'type' => PARAM_CLEANHTML, 'default' => '' ), 'descriptionformat' => array( 'choices' => array(FORMAT_HTML, FORMAT_MOODLE, FORMAT_PLAIN, FORMAT_MARKDOWN), 'type' => PARAM_INT, 'default' => FORMAT_HTML ), 'visible' => array( 'type' => PARAM_BOOL, 'default' => 1 ), 'scaleid' => array( 'type' => PARAM_INT ), 'scaleconfiguration' => array( 'type' => PARAM_RAW ), 'contextid' => array( 'type' => PARAM_INT ), 'taxonomies' => array( 'type' => PARAM_RAW, 'default' => '' ) ); } /** * Hook to execute before validate. * * @return void */ protected function before_validate() { $this->beforeupdate = null; // During update. if ($this->get('id')) { $this->beforeupdate = new competency_framework($this->get('id')); } } /** * Return the current depth of a competency framework. * * @see competency::get_framework_depth() * @return int */ public function get_depth() { return competency::get_framework_depth($this->get('id')); } /** * Return the scale. * * @return \grade_scale */ public function get_scale() { $scale = \grade_scale::fetch(array('id' => $this->get('scaleid'))); $scale->load_items(); return $scale; } /** * Get the constant name for a level. * * @param int $level The level of the term. * @return string */ public function get_taxonomy($level) { $taxonomies = $this->get_taxonomies(); if (empty($taxonomies[$level])) { // If for some reason we cannot find the level, we fallback onto competency. $constant = self::TAXONOMY_COMPETENCY; } else { $constant = $taxonomies[$level]; } return $constant; } /** * Return the taxonomy constants indexed by level. * * @return array Contains the list of taxonomy constants indexed by level. */ protected function get_taxonomies() { $taxonomies = explode(',', $this->raw_get('taxonomies')); // Indexing first level at 1. array_unshift($taxonomies, null); unset($taxonomies[0]); // Ensure that we do not return empty levels. foreach ($taxonomies as $i => $taxonomy) { if (empty($taxonomy)) { $taxonomies[$i] = self::TAXONOMY_COMPETENCY; } } return $taxonomies; } /** * Returns true when some competencies of the framework have user competencies. * * This is useful to determine if the framework, or part of it, should be locked down. * * @return boolean */ public function has_user_competencies() { return user_competency::has_records_for_framework($this->get('id')) || user_competency_plan::has_records_for_framework($this->get('id')); } /** * Convenience method to set taxonomies from an array or string. * * @param string|array $taxonomies A string, or an array where the values are the term constants. */ protected function set_taxonomies($taxonomies) { if (is_array($taxonomies)) { $taxonomies = implode(',', $taxonomies); } $this->raw_set('taxonomies', $taxonomies); } /** * Validate the context ID. * * @param int $value The context ID. * @return bool|lang_string */ protected function validate_contextid($value) { global $DB; $context = context::instance_by_id($value, IGNORE_MISSING); if (!$context) { return new lang_string('invalidcontext', 'error'); } else if ($context->contextlevel != CONTEXT_SYSTEM && $context->contextlevel != CONTEXT_COURSECAT) { return new lang_string('invalidcontext', 'error'); } // During update. if ($this->get('id')) { // The context must never change. $oldcontextid = $DB->get_field(self::TABLE, 'contextid', array('id' => $this->get('id')), MUST_EXIST); if ($this->get('contextid') != $oldcontextid) { return new lang_string('invalidcontext', 'error'); } } return true; } /** * Validate the id number. * * @param string $value The id number. * @return bool|lang_string */ protected function validate_idnumber($value) { global $DB; $params = array( 'id' => $this->get('id'), 'idnumber' => $value, ); if ($DB->record_exists_select(self::TABLE, 'idnumber = :idnumber AND id <> :id', $params)) { return new lang_string('idnumbertaken', 'error'); } return true; } /** * Validate the scale ID. * * @param string $value The scale ID. * @return bool|lang_string */ protected function validate_scaleid($value) { global $DB; // Always validate that the scale exists. if (!$DB->record_exists_select('scale', 'id = :id', array('id' => $value))) { return new lang_string('invalidscaleid', 'error'); } // During update. if ($this->get('id')) { // Validate that we can only change the scale when it is not used yet. if ($this->beforeupdate->get('scaleid') != $value) { if ($this->beforeupdate->has_user_competencies()) { return new lang_string('errorscalealreadyused', 'core_competency'); } } } return true; } /** * Validate the scale configuration. * * @param string $value The scale configuration. * @return bool|lang_string */ protected function validate_scaleconfiguration($value) { $scaledefaultselected = false; $proficientselected = false; $scaleconfigurations = json_decode($value); if (is_array($scaleconfigurations)) { // The first element of the array contains the scale ID. $scaleinfo = array_shift($scaleconfigurations); if (empty($scaleinfo) || !isset($scaleinfo->scaleid) || $scaleinfo->scaleid != $this->get('scaleid')) { // This should never happen. return new lang_string('errorscaleconfiguration', 'core_competency'); } // Walk through the array to find proficient and default values. foreach ($scaleconfigurations as $scaleconfiguration) { if (isset($scaleconfiguration->scaledefault) && $scaleconfiguration->scaledefault) { $scaledefaultselected = true; } if (isset($scaleconfiguration->proficient) && $scaleconfiguration->proficient) { $proficientselected = true; } } } if (!$scaledefaultselected || !$proficientselected) { return new lang_string('errorscaleconfiguration', 'core_competency'); } return true; } /** * Validate taxonomies. * * @param mixed $value The taxonomies. * @return true|lang_string */ protected function validate_taxonomies($value) { $terms = explode(',', $value); foreach ($terms as $term) { if (!empty($term) && !array_key_exists($term, self::get_taxonomies_list())) { return new lang_string('invalidtaxonomy', 'core_competency', $term); } } return true; } /** * Extract the default grade from a scale configuration. * * Returns an array where the first element is the grade, and the second * is a boolean representing whether or not this grade is considered 'proficient'. * * @param string $config JSON encoded config. * @return array(int grade, int proficient) */ public static function get_default_grade_from_scale_configuration($config) { $config = json_decode($config); if (!is_array($config)) { throw new coding_exception('Unexpected scale configuration.'); } // Remove the scale ID from the config. array_shift($config); foreach ($config as $part) { if ($part->scaledefault) { return array((int) $part->id, (int) $part->proficient); } } throw new coding_exception('Invalid scale configuration, default not found.'); } /** * Extract the proficiency of a grade from a scale configuration. * * @param string $config JSON encoded config. * @param int $grade The grade. * @return int Representing a boolean */ public static function get_proficiency_of_grade_from_scale_configuration($config, $grade) { $config = json_decode($config); if (!is_array($config)) { throw new coding_exception('Unexpected scale configuration.'); } // Remove the scale ID from the config. array_shift($config); foreach ($config as $part) { if ($part->id == $grade) { return (int) $part->proficient; } } return 0; } /** * Get the string of a taxonomy from a constant * * @param string $constant The taxonomy constant. * @return lang_string */ public static function get_taxonomy_from_constant($constant) { return self::get_taxonomies_list()[$constant]; } /** * Get the list of all taxonomies. * * @return array Where the key is the taxonomy constant, and the value its translation. */ public static function get_taxonomies_list() { static $list = null; // At some point we'll have to switch to not using static cache, mainly for Unit Tests in case we // decide to allow more taxonomies to be added dynamically from a CFG variable for instance. if ($list === null) { $list = array( self::TAXONOMY_BEHAVIOUR => new lang_string('taxonomy_' . self::TAXONOMY_BEHAVIOUR, 'core_competency'), self::TAXONOMY_COMPETENCY => new lang_string('taxonomy_' . self::TAXONOMY_COMPETENCY, 'core_competency'), self::TAXONOMY_CONCEPT => new lang_string('taxonomy_' . self::TAXONOMY_CONCEPT, 'core_competency'), self::TAXONOMY_DOMAIN => new lang_string('taxonomy_' . self::TAXONOMY_DOMAIN, 'core_competency'), self::TAXONOMY_INDICATOR => new lang_string('taxonomy_' . self::TAXONOMY_INDICATOR, 'core_competency'), self::TAXONOMY_LEVEL => new lang_string('taxonomy_' . self::TAXONOMY_LEVEL, 'core_competency'), self::TAXONOMY_OUTCOME => new lang_string('taxonomy_' . self::TAXONOMY_OUTCOME, 'core_competency'), self::TAXONOMY_PRACTICE => new lang_string('taxonomy_' . self::TAXONOMY_PRACTICE, 'core_competency'), self::TAXONOMY_PROFICIENCY => new lang_string('taxonomy_' . self::TAXONOMY_PROFICIENCY, 'core_competency'), self::TAXONOMY_SKILL => new lang_string('taxonomy_' . self::TAXONOMY_SKILL, 'core_competency'), self::TAXONOMY_VALUE => new lang_string('taxonomy_' . self::TAXONOMY_VALUE, 'core_competency'), ); } return $list; } /** * Get a uniq idnumber. * * @param string $idnumber the framework idnumber * @return string */ public static function get_unused_idnumber($idnumber) { global $DB; $currentidnumber = $idnumber; $counter = 0; // Iteratere while the idnumber exists. while ($DB->record_exists_select(static::TABLE, 'idnumber = ?', array($currentidnumber))) { $suffixidnumber = '_' . ++$counter; $currentidnumber = substr($idnumber, 0, 100 - strlen($suffixidnumber)).$suffixidnumber; } // Return the uniq idnumber. return $currentidnumber; } /** * Whether or not the current user can manage the framework. * * @return bool */ public function can_manage() { return self::can_manage_context($this->get_context()); } /** * Whether or not the current user can manage the framework. * * @param context $context * @return bool */ public static function can_manage_context($context) { return has_capability('moodle/competency:competencymanage', $context); } /** * Whether or not the current user can read the framework. * * @return bool */ public function can_read() { return self::can_read_context($this->get_context()); } /** * Whether or not the current user can read the framework. * * @param context $context * @return bool */ public static function can_read_context($context) { return has_capability('moodle/competency:competencyview', $context) || self::can_manage_context($context); } }