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Differences Between: [Versions 401 and 402] [Versions 401 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Class for loading/storing competency frameworks from the DB.
  19   *
  20   * @package    core_competency
  21   * @copyright  2015 Damyon Wiese
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  namespace core_competency;
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  use coding_exception;
  28  use context;
  29  use lang_string;
  30  use stdClass;
  31  
  32  require_once($CFG->libdir . '/grade/grade_scale.php');
  33  
  34  /**
  35   * Class for loading/storing competency frameworks from the DB.
  36   *
  37   * @copyright  2015 Damyon Wiese
  38   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  39   */
  40  class competency_framework extends persistent {
  41  
  42      const TABLE = 'competency_framework';
  43  
  44      /** Taxonomy constant. */
  45      const TAXONOMY_BEHAVIOUR = 'behaviour';
  46      /** Taxonomy constant. */
  47      const TAXONOMY_COMPETENCY = 'competency';
  48      /** Taxonomy constant. */
  49      const TAXONOMY_CONCEPT = 'concept';
  50      /** Taxonomy constant. */
  51      const TAXONOMY_DOMAIN = 'domain';
  52      /** Taxonomy constant. */
  53      const TAXONOMY_INDICATOR = 'indicator';
  54      /** Taxonomy constant. */
  55      const TAXONOMY_LEVEL = 'level';
  56      /** Taxonomy constant. */
  57      const TAXONOMY_OUTCOME = 'outcome';
  58      /** Taxonomy constant. */
  59      const TAXONOMY_PRACTICE = 'practice';
  60      /** Taxonomy constant. */
  61      const TAXONOMY_PROFICIENCY = 'proficiency';
  62      /** Taxonomy constant. */
  63      const TAXONOMY_SKILL = 'skill';
  64      /** Taxonomy constant. */
  65      const TAXONOMY_VALUE = 'value';
  66  
  67      /** @var static The object before it was updated. */
  68      protected $beforeupdate;
  69  
  70      /**
  71       * Get the context.
  72       *
  73       * @return context The context
  74       */
  75      public function get_context() {
  76          return context::instance_by_id($this->get('contextid'));
  77      }
  78  
  79      /**
  80       * Return the definition of the properties of this model.
  81       *
  82       * @return array
  83       */
  84      protected static function define_properties() {
  85          return array(
  86              'shortname' => array(
  87                  'type' => PARAM_TEXT
  88              ),
  89              'idnumber' => array(
  90                  'type' => PARAM_RAW
  91              ),
  92              'description' => array(
  93                  'type' => PARAM_CLEANHTML,
  94                  'default' => ''
  95              ),
  96              'descriptionformat' => array(
  97                  'choices' => array(FORMAT_HTML, FORMAT_MOODLE, FORMAT_PLAIN, FORMAT_MARKDOWN),
  98                  'type' => PARAM_INT,
  99                  'default' => FORMAT_HTML
 100              ),
 101              'visible' => array(
 102                  'type' => PARAM_BOOL,
 103                  'default' => 1
 104              ),
 105              'scaleid' => array(
 106                  'type' => PARAM_INT
 107              ),
 108              'scaleconfiguration' => array(
 109                  'type' => PARAM_RAW
 110              ),
 111              'contextid' => array(
 112                  'type' => PARAM_INT
 113              ),
 114              'taxonomies' => array(
 115                  'type' => PARAM_RAW,
 116                  'default' => ''
 117              )
 118          );
 119      }
 120  
 121      /**
 122       * Hook to execute before validate.
 123       *
 124       * @return void
 125       */
 126      protected function before_validate() {
 127          $this->beforeupdate = null;
 128  
 129          // During update.
 130          if ($this->get('id')) {
 131              $this->beforeupdate = new competency_framework($this->get('id'));
 132          }
 133  
 134      }
 135  
 136      /**
 137       * Return the current depth of a competency framework.
 138       *
 139       * @see competency::get_framework_depth()
 140       * @return int
 141       */
 142      public function get_depth() {
 143          return competency::get_framework_depth($this->get('id'));
 144      }
 145  
 146      /**
 147       * Return the scale.
 148       *
 149       * @return \grade_scale
 150       */
 151      public function get_scale() {
 152          $scale = \grade_scale::fetch(array('id' => $this->get('scaleid')));
 153          $scale->load_items();
 154          return $scale;
 155      }
 156  
 157      /**
 158       * Get the constant name for a level.
 159       *
 160       * @param  int $level The level of the term.
 161       * @return string
 162       */
 163      public function get_taxonomy($level) {
 164          $taxonomies = $this->get_taxonomies();
 165  
 166          if (empty($taxonomies[$level])) {
 167              // If for some reason we cannot find the level, we fallback onto competency.
 168              $constant = self::TAXONOMY_COMPETENCY;
 169          } else {
 170              $constant = $taxonomies[$level];
 171          }
 172  
 173          return $constant;
 174      }
 175  
 176      /**
 177       * Return the taxonomy constants indexed by level.
 178       *
 179       * @return array Contains the list of taxonomy constants indexed by level.
 180       */
 181      protected function get_taxonomies() {
 182          $taxonomies = explode(',', $this->raw_get('taxonomies'));
 183  
 184          // Indexing first level at 1.
 185          array_unshift($taxonomies, null);
 186          unset($taxonomies[0]);
 187  
 188          // Ensure that we do not return empty levels.
 189          foreach ($taxonomies as $i => $taxonomy) {
 190              if (empty($taxonomy)) {
 191                  $taxonomies[$i] = self::TAXONOMY_COMPETENCY;
 192              }
 193          }
 194  
 195          return $taxonomies;
 196      }
 197  
 198      /**
 199       * Returns true when some competencies of the framework have user competencies.
 200       *
 201       * This is useful to determine if the framework, or part of it, should be locked down.
 202       *
 203       * @return boolean
 204       */
 205      public function has_user_competencies() {
 206          return user_competency::has_records_for_framework($this->get('id')) ||
 207              user_competency_plan::has_records_for_framework($this->get('id'));
 208      }
 209  
 210      /**
 211       * Convenience method to set taxonomies from an array or string.
 212       *
 213       * @param string|array $taxonomies A string, or an array where the values are the term constants.
 214       */
 215      protected function set_taxonomies($taxonomies) {
 216          if (is_array($taxonomies)) {
 217              $taxonomies = implode(',', $taxonomies);
 218          }
 219          $this->raw_set('taxonomies', $taxonomies);
 220      }
 221  
 222      /**
 223       * Validate the context ID.
 224       *
 225       * @param  int $value The context ID.
 226       * @return bool|lang_string
 227       */
 228      protected function validate_contextid($value) {
 229          global $DB;
 230  
 231          $context = context::instance_by_id($value, IGNORE_MISSING);
 232          if (!$context) {
 233              return new lang_string('invalidcontext', 'error');
 234          } else if ($context->contextlevel != CONTEXT_SYSTEM && $context->contextlevel != CONTEXT_COURSECAT) {
 235              return new lang_string('invalidcontext', 'error');
 236          }
 237  
 238          // During update.
 239          if ($this->get('id')) {
 240  
 241              // The context must never change.
 242              $oldcontextid = $DB->get_field(self::TABLE, 'contextid', array('id' => $this->get('id')), MUST_EXIST);
 243              if ($this->get('contextid') != $oldcontextid) {
 244                  return new lang_string('invalidcontext', 'error');
 245              }
 246          }
 247  
 248          return true;
 249      }
 250  
 251      /**
 252       * Validate the id number.
 253       *
 254       * @param  string $value The id number.
 255       * @return bool|lang_string
 256       */
 257      protected function validate_idnumber($value) {
 258          global $DB;
 259  
 260          $params = array(
 261              'id' => $this->get('id'),
 262              'idnumber' => $value,
 263          );
 264  
 265          if ($DB->record_exists_select(self::TABLE, 'idnumber = :idnumber AND id <> :id', $params)) {
 266              return new lang_string('idnumbertaken', 'error');
 267          }
 268  
 269          return true;
 270      }
 271  
 272      /**
 273       * Validate the scale ID.
 274       *
 275       * @param  string $value The scale ID.
 276       * @return bool|lang_string
 277       */
 278      protected function validate_scaleid($value) {
 279          global $DB;
 280  
 281          // Always validate that the scale exists.
 282          if (!$DB->record_exists_select('scale', 'id = :id', array('id' => $value))) {
 283              return new lang_string('invalidscaleid', 'error');
 284          }
 285  
 286          // During update.
 287          if ($this->get('id')) {
 288  
 289              // Validate that we can only change the scale when it is not used yet.
 290              if ($this->beforeupdate->get('scaleid') != $value) {
 291                  if ($this->beforeupdate->has_user_competencies()) {
 292                      return new lang_string('errorscalealreadyused', 'core_competency');
 293                  }
 294              }
 295  
 296          }
 297  
 298          return true;
 299      }
 300  
 301      /**
 302       * Validate the scale configuration.
 303       *
 304       * @param  string $value The scale configuration.
 305       * @return bool|lang_string
 306       */
 307      protected function validate_scaleconfiguration($value) {
 308          $scaledefaultselected = false;
 309          $proficientselected = false;
 310          $scaleconfigurations = json_decode($value);
 311  
 312          if (is_array($scaleconfigurations)) {
 313  
 314              // The first element of the array contains the scale ID.
 315              $scaleinfo = array_shift($scaleconfigurations);
 316              if (empty($scaleinfo) || !isset($scaleinfo->scaleid) || $scaleinfo->scaleid != $this->get('scaleid')) {
 317                  // This should never happen.
 318                  return new lang_string('errorscaleconfiguration', 'core_competency');
 319              }
 320  
 321              // Walk through the array to find proficient and default values.
 322              foreach ($scaleconfigurations as $scaleconfiguration) {
 323                  if (isset($scaleconfiguration->scaledefault) && $scaleconfiguration->scaledefault) {
 324                      $scaledefaultselected = true;
 325                  }
 326                  if (isset($scaleconfiguration->proficient) && $scaleconfiguration->proficient) {
 327                      $proficientselected = true;
 328                  }
 329              }
 330          }
 331  
 332          if (!$scaledefaultselected || !$proficientselected) {
 333              return new lang_string('errorscaleconfiguration', 'core_competency');
 334          }
 335  
 336          return true;
 337      }
 338  
 339      /**
 340       * Validate taxonomies.
 341       *
 342       * @param  mixed $value The taxonomies.
 343       * @return true|lang_string
 344       */
 345      protected function validate_taxonomies($value) {
 346          $terms = explode(',', $value);
 347  
 348          foreach ($terms as $term) {
 349              if (!empty($term) && !array_key_exists($term, self::get_taxonomies_list())) {
 350                  return new lang_string('invalidtaxonomy', 'core_competency', $term);
 351              }
 352          }
 353  
 354          return true;
 355      }
 356  
 357      /**
 358       * Extract the default grade from a scale configuration.
 359       *
 360       * Returns an array where the first element is the grade, and the second
 361       * is a boolean representing whether or not this grade is considered 'proficient'.
 362       *
 363       * @param  string $config JSON encoded config.
 364       * @return array(int grade, int proficient)
 365       */
 366      public static function get_default_grade_from_scale_configuration($config) {
 367          $config = json_decode($config);
 368          if (!is_array($config)) {
 369              throw new coding_exception('Unexpected scale configuration.');
 370          }
 371  
 372          // Remove the scale ID from the config.
 373          array_shift($config);
 374  
 375          foreach ($config as $part) {
 376              if ($part->scaledefault) {
 377                  return array((int) $part->id, (int) $part->proficient);
 378              }
 379          }
 380  
 381          throw new coding_exception('Invalid scale configuration, default not found.');
 382      }
 383  
 384      /**
 385       * Extract the proficiency of a grade from a scale configuration.
 386       *
 387       * @param  string $config JSON encoded config.
 388       * @param  int $grade The grade.
 389       * @return int Representing a boolean
 390       */
 391      public static function get_proficiency_of_grade_from_scale_configuration($config, $grade) {
 392          $config = json_decode($config);
 393          if (!is_array($config)) {
 394              throw new coding_exception('Unexpected scale configuration.');
 395          }
 396  
 397          // Remove the scale ID from the config.
 398          array_shift($config);
 399  
 400          foreach ($config as $part) {
 401              if ($part->id == $grade) {
 402                  return (int) $part->proficient;
 403              }
 404          }
 405  
 406          return 0;
 407      }
 408  
 409      /**
 410       * Get the string of a taxonomy from a constant
 411       *
 412       * @param  string $constant The taxonomy constant.
 413       * @return lang_string
 414       */
 415      public static function get_taxonomy_from_constant($constant) {
 416          return self::get_taxonomies_list()[$constant];
 417      }
 418  
 419      /**
 420       * Get the list of all taxonomies.
 421       *
 422       * @return array Where the key is the taxonomy constant, and the value its translation.
 423       */
 424      public static function get_taxonomies_list() {
 425          static $list = null;
 426  
 427          // At some point we'll have to switch to not using static cache, mainly for Unit Tests in case we
 428          // decide to allow more taxonomies to be added dynamically from a CFG variable for instance.
 429          if ($list === null) {
 430              $list = array(
 431                  self::TAXONOMY_BEHAVIOUR => new lang_string('taxonomy_' . self::TAXONOMY_BEHAVIOUR, 'core_competency'),
 432                  self::TAXONOMY_COMPETENCY => new lang_string('taxonomy_' . self::TAXONOMY_COMPETENCY, 'core_competency'),
 433                  self::TAXONOMY_CONCEPT => new lang_string('taxonomy_' . self::TAXONOMY_CONCEPT, 'core_competency'),
 434                  self::TAXONOMY_DOMAIN => new lang_string('taxonomy_' . self::TAXONOMY_DOMAIN, 'core_competency'),
 435                  self::TAXONOMY_INDICATOR => new lang_string('taxonomy_' . self::TAXONOMY_INDICATOR, 'core_competency'),
 436                  self::TAXONOMY_LEVEL => new lang_string('taxonomy_' . self::TAXONOMY_LEVEL, 'core_competency'),
 437                  self::TAXONOMY_OUTCOME => new lang_string('taxonomy_' . self::TAXONOMY_OUTCOME, 'core_competency'),
 438                  self::TAXONOMY_PRACTICE => new lang_string('taxonomy_' . self::TAXONOMY_PRACTICE, 'core_competency'),
 439                  self::TAXONOMY_PROFICIENCY => new lang_string('taxonomy_' . self::TAXONOMY_PROFICIENCY, 'core_competency'),
 440                  self::TAXONOMY_SKILL => new lang_string('taxonomy_' . self::TAXONOMY_SKILL, 'core_competency'),
 441                  self::TAXONOMY_VALUE => new lang_string('taxonomy_' . self::TAXONOMY_VALUE, 'core_competency'),
 442              );
 443          }
 444  
 445          return $list;
 446      }
 447  
 448      /**
 449       * Get a uniq idnumber.
 450       *
 451       * @param string $idnumber the framework idnumber
 452       * @return string
 453       */
 454      public static function get_unused_idnumber($idnumber) {
 455          global $DB;
 456  
 457          $currentidnumber = $idnumber;
 458          $counter = 0;
 459          // Iteratere while the idnumber exists.
 460          while ($DB->record_exists_select(static::TABLE, 'idnumber = ?', array($currentidnumber))) {
 461              $suffixidnumber = '_' . ++$counter;
 462              $currentidnumber = substr($idnumber, 0, 100 - strlen($suffixidnumber)).$suffixidnumber;
 463          }
 464  
 465          // Return the uniq idnumber.
 466          return $currentidnumber;
 467      }
 468  
 469      /**
 470       * Whether or not the current user can manage the framework.
 471       *
 472       * @return bool
 473       */
 474      public function can_manage() {
 475          return self::can_manage_context($this->get_context());
 476      }
 477  
 478      /**
 479       * Whether or not the current user can manage the framework.
 480       *
 481       * @param  context $context
 482       * @return bool
 483       */
 484      public static function can_manage_context($context) {
 485          return has_capability('moodle/competency:competencymanage', $context);
 486      }
 487  
 488      /**
 489       * Whether or not the current user can read the framework.
 490       *
 491       * @return bool
 492       */
 493      public function can_read() {
 494          return self::can_read_context($this->get_context());
 495      }
 496  
 497      /**
 498       * Whether or not the current user can read the framework.
 499       *
 500       * @param  context $context
 501       * @return bool
 502       */
 503      public static function can_read_context($context) {
 504          return has_capability('moodle/competency:competencyview', $context) || self::can_manage_context($context);
 505      }
 506  
 507  }