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| 1 | <?php |
| 2 | |
| 3 | /* |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program 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 this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2013 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT); |
| 19 | * |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | namespace oat\taoQtiItem\model\qti\datatype; |
| 24 | |
| 25 | use oat\taoQtiItem\model\qti\datatype\Identifier; |
| 26 | use oat\taoQtiItem\model\qti\datatype\Datatype; |
| 27 | |
| 28 | /** |
| 29 | * The basic Identifier data type |
| 30 | * |
| 31 | * @see http://www.imsglobal.org/question/qtiv2p1/imsqti_infov2p1.html#element10722 |
| 32 | * @access public |
| 33 | * @author Sam, <sam@taotesting.com> |
| 34 | * @package taoQTI |
| 35 | |
| 36 | */ |
| 37 | class Identifier extends Datatype |
| 38 | { |
| 39 | /** |
| 40 | * The identifier datatype must hold directly the reference to the referenced object |
| 41 | * Indeed, QTI allow identical identifiers for different qti elements |
| 42 | * (e.g. a choice and a feedback can share the same identifier) |
| 43 | * |
| 44 | * @param oat\taoQtiItem\model\qti\IdentifiedElement $value |
| 45 | * @return boolean |
| 46 | */ |
| 47 | public static function validate($value) |
| 48 | { |
| 49 | return !is_null(self::fix($value)); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Check if the identifier string is correct per the QTI standard |
| 54 | * |
| 55 | * @param string $identifier |
| 56 | * @return boolean |
| 57 | */ |
| 58 | public static function checkIdentifier($identifier) |
| 59 | { |
| 60 | return preg_match('/^[_a-z]{1}[a-z0-9-._]{0,31}$/ims', $identifier); |
| 61 | } |
| 62 | |
| 63 | public static function fix($value) |
| 64 | { |
| 65 | |
| 66 | $returnValue = null; |
| 67 | |
| 68 | foreach (static::getAllowedClasses() as $class) { |
| 69 | if ($value instanceof $class) { |
| 70 | $returnValue = $value; |
| 71 | break; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | return $returnValue; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Define the array of authorized QTI element classes |
| 80 | * |
| 81 | * @return array |
| 82 | */ |
| 83 | public static function getAllowedClasses() |
| 84 | { |
| 85 | return [ |
| 86 | 'oat\\taoQtiItem\\model\\qti\\IdentifiedElement' |
| 87 | ]; |
| 88 | } |
| 89 | |
| 90 | public function getValue() |
| 91 | { |
| 92 | |
| 93 | $returnValue = null; |
| 94 | |
| 95 | if (!is_null($this->value)) { |
| 96 | $returnValue = $this->value->getIdentifier(); |
| 97 | } |
| 98 | |
| 99 | return $returnValue; |
| 100 | } |
| 101 | |
| 102 | public function getReferencedObject() |
| 103 | { |
| 104 | |
| 105 | $returnValue = null; |
| 106 | |
| 107 | if (!is_null($this->value)) { |
| 108 | $returnValue = $this->value; |
| 109 | } |
| 110 | |
| 111 | return $returnValue; |
| 112 | } |
| 113 | } |