741 lines
24 KiB
PHP
741 lines
24 KiB
PHP
<?php
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/*
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* This program 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; under version 2 of the License (non-upgradable). This program 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 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. Copyright (c) 2013 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
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*/
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namespace oat\taoQtiItem\model\qti;
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use InvalidArgumentException;
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use oat\taoQtiItem\model\qti\exception\QtiModelException;
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use oat\taoQtiItem\model\qti\attribute\Generic;
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use oat\taoQtiItem\model\qti\container\FlowContainer;
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use oat\taoQtiItem\model\qti\attribute\ResponseIdentifier;
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use common_Logger;
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use taoItems_models_classes_TemplateRenderer;
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use ReflectionClass;
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use stdClass;
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/**
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* The QTI_Element class represent the abstract model for all the QTI objects.
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* It contains all the attributes of the different kind of QTI objects.
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* It manages the identifiers and serial creation.
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* It provides the serialisation and persistence methods.
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* And give the interface for the rendering.
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*
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* @abstract
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*
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* @access public
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* @author Sam, <sam@taotesting.com>
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* @package taoQTI
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*/
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abstract class Element implements Exportable
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{
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protected $serial = '';
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protected $relatedItem = null;
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private static $instances = [];
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/**
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* Short description of attribute templatesPath
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*
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* @access protected
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* @var string
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*/
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protected static $templatesPath = '';
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/**
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* the QTI tag name as defined in QTI standard
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*
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* @access protected
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* @var string
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*/
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protected static $qtiTagName = '';
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/**
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* the options of the element
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*
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* @access protected
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* @var array
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*/
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protected $attributes = [];
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public function __construct($attributes = [], Item $relatedItem = null, $serial = '')
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{
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if (!is_null($relatedItem)) {
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$this->setRelatedItem($relatedItem);
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}
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if (!empty($serial)) {
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//try setting object serial manually:
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if (isset(self::$instances[$this->getSerial()])) {
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throw new QtiModelException('the serial must be unique');
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} else {
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$this->serial = $serial;
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}
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} else {
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$this->getSerial(); //generate one
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}
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$this->resetAttributes();
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$this->setAttributes($attributes);
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self::$instances[$this->getSerial()] = $this;
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}
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/**
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* Provide the list of attributes of the Qti Element Class
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*/
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abstract protected function getUsedAttributes();
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/**
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* Reset the attributes values to the default values defined by the standard
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*/
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public function resetAttributes()
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{
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$this->attributes = [];
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foreach ($this->getUsedAttributes() as $attributeClass) {
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if (class_exists($attributeClass) && is_subclass_of($attributeClass, 'oat\\taoQtiItem\\model\\qti\\attribute\\Attribute')) {
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$attribute = new $attributeClass();
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$this->attributes[$attribute->getName()] = $attribute;
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} else {
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common_Logger::w('attr does not exists ' . $attributeClass);
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}
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}
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}
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public function getQtiTag()
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{
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return static::$qtiTagName;
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}
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/**
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* Remove the actual value of an attribute, distinguish from empty value
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*
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* @param string $name
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*/
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public function removeAttributeValue($name)
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{
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if (isset($this->attributes[$name])) {
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$this->attributes[$name]->setNull();
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}
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}
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/**
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* Set the attributes for the the Qti Element
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* Argument format: array(attributeName => value)
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*
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* @param array $values
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* @throws InvalidArgumentException
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*/
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public function setAttributes($values)
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{
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if (is_array($values)) {
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foreach ($values as $name => $value) {
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$this->setAttribute($name, $value);
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}
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} else {
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throw new InvalidArgumentException('"values" must be an array');
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}
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}
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/**
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* Set the value of an attribute
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*
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* @param string $name
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* @param mixed $value
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* @return boolean
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* @throws InvalidArgumentException
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* @throws \oat\taoQtiItem\model\qti\exception\QtiModelException
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*/
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public function setAttribute($name, $value)
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{
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$returnValue = false;
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if (is_null($value)) {
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return $returnValue;
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}
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if (isset($this->attributes[$name])) {
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$datatypeClass = $this->attributes[$name]->getType();
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// check if the attribute needs an element level validation
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if (is_subclass_of($datatypeClass, 'oat\\taoQtiItem\\model\\qti\\datatype\\Identifier')) {
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if ($value instanceof IdentifiedElement) {
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if ($this->validateAttribute($name, $value)) {
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$this->attributes[$name]->setValue($value);
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$returnValue = true;
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} else {
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$vr = print_r($value, true);
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common_Logger::w($vr);
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throw new InvalidArgumentException('Invalid identifier attribute value');
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}
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} elseif (is_string($value)) {
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// try converting to string identifier and search the identified object:
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$identifier = (string) $value;
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$elt = $this->getIdentifiedElement($identifier, $datatypeClass::getAllowedClasses());
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if (!is_null($elt)) {
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// ok, found among allowed classes
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$this->attributes[$name]->setValue($elt);
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$returnValue = true;
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} else {
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throw new QtiModelException('No QTI element with the identifier has been found: ' . $identifier);
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}
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}
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} else {
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$this->attributes[$name]->setValue($value);
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$returnValue = true;
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}
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} else {
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$this->attributes[$name] = new Generic($value);
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$returnValue = true;
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}
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return $returnValue;
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}
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/**
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* Validate an attribute of the element, at the element level
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* (the validator of the attributes are on the attribute level)
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*
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* @param string $name
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* @param mixed $value
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* @return boolean
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* @throws \oat\taoQtiItem\model\qti\exception\QtiModelException
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*/
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public function validateAttribute($name, $value = null)
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{
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$returnValue = false;
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if (isset($this->attributes[$name])) {
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if (is_null($value)) {
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$value = $this->attributes[$name]->getValue();
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}
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$datatypeClass = $this->attributes[$name]->getType();
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if (is_subclass_of($datatypeClass, 'oat\\taoQtiItem\\model\\qti\\datatype\\Identifier')) {
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} else {
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$returnValue = $datatypeClass::validate($value);
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}
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if (is_subclass_of($datatypeClass, 'oat\\taoQtiItem\\model\\qti\\datatype\\Identifier')) {
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if ($datatypeClass::validate($value)) {
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// validate itentifier
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$relatedItem = $this->getRelatedItem();
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if (!is_null($relatedItem)) {
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$idCollection = $relatedItem->getIdentifiedElements();
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if ($value instanceof IdentifiedElement && $idCollection->exists($value->getIdentifier())) {
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$returnValue = true;
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}
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} else {
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common_Logger::w('iden');
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throw new QtiModelException('Cannot verify identifier reference because the element is not in a QTI Item ' . get_class($this) . '::' . $name, 0);
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}
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}
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} else {
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$returnValue = $datatypeClass::validate($value);
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}
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} else {
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throw new InvalidArgumentException('no attribute found with the name "' . $name . '"');
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}
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return $returnValue;
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}
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/**
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* Find the identified object corresponding to the identifier string
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* The optional argument $elementClasses search a specific QTI element class
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*
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* @param string $identifier
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* @param array $elementClasses
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* @return \oat\taoQtiItem\model\qti\IdentifiedElement
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*/
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public function getIdentifiedElement($identifier, $elementClasses = [])
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{
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$returnValue = null;
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if (!is_array($elementClasses)) {
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throw new InvalidArgumentException('elementClasses must be an array');
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}
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$relatedItem = $this->getRelatedItem();
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if (!is_null($relatedItem)) {
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$identifiedElementsCollection = $relatedItem->getIdentifiedElements();
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if (empty($elementClasses)) {
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$returnValue = $identifiedElementsCollection->getUnique($identifier);
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} else {
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foreach ($elementClasses as $elementClass) {
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$returnValue = $identifiedElementsCollection->getUnique($identifier, $elementClass);
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if (!is_null($returnValue)) {
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break;
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}
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}
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}
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}
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return $returnValue;
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}
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/**
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* Check if an attribute exists within the Qti Element
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*
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* @param string $name
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* @return boolean
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*/
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public function hasAttribute($name)
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{
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return isset($this->attributes[$name]);
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}
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/**
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* Short handy method to get/set an attribute value
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*
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* @param string $name
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* @param mixed $value
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* @return mixed
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*/
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public function attr($name, $value = null)
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{
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if (is_null($value)) {
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return $this->getAttributeValue($name);
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} else {
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return $this->setAttribute($name, $value);
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}
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}
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/**
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* Add a CSS class to the item body
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*
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* @author Dieter Raber <dieter@taotesting.com>
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* @param $className one or more class names, separated by space
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*/
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public function addClass($className)
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{
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$oldClassName = $this->getAttributeValue('class');
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$oldClassNameArr = $oldClassName ? explode(' ', $oldClassName) : [];
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$classNameArr = array_merge($oldClassNameArr, explode(' ', $className));
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// housekeeping
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$classNameArr = array_unique(array_filter(array_map('trim', $classNameArr)));
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$this->setAttribute('class', implode(' ', $classNameArr));
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}
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/**
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* Add a CSS class from the item body
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*
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* @author Dieter Raber <dieter@taotesting.com>
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* @param $className
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*/
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public function removeClass($className)
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{
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$oldClassName = $this->getAttributeValue('class');
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$oldClassNameArr = $oldClassName ? explode(' ', $oldClassName) : [];
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unset($oldClassNameArr[array_search($className, $oldClassNameArr)]);
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$this->setAttribute('class', implode(' ', $oldClassNameArr));
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}
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/**
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* Get the attribute as an Attribute object
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*
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* @param type $name
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* @return \oat\taoQtiItem\model\qti\attribute\Attribute
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*/
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protected function getAttribute($name)
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{
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return $this->hasAttribute($name) ? $this->attributes[$name] : null;
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}
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/**
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* Get the attribute's actual value (not as an Attribute object)
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*
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* @param string $name
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* @return mixed
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*/
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public function getAttributeValue($name)
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{
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$returnValue = null;
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if ($this->hasAttribute($name)) {
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$returnValue = $this->attributes[$name]->getValue();
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}
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return $returnValue;
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}
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/**
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* Get all attributes' values
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*
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* @return array
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*/
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public function getAttributeValues($filterNull = true)
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{
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$returnValue = [];
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foreach ($this->attributes as $name => $attribute) {
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if (!$filterNull || !$attribute->isNull()) {
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$returnValue[$name] = $attribute->getValue();
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}
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}
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return $returnValue;
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}
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/**
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* Get the placeholder of the Qti Element to used in a Container
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*
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* @see oat\taoQtiItem\model\qti\container\Container
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* @return string
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*/
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public function getPlaceholder()
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{
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return '{{' . $this->getSerial() . '}}';
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}
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/**
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* Get the absolute path of the template of the qti.xml
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*
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* @return string
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* @throws \oat\taoQtiItem\model\qti\exception\QtiModelException
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*/
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public static function getTemplateQti()
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{
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if (empty(static::$qtiTagName)) {
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throw new QtiModelException('The element has no tag name defined : ' . get_called_class());
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}
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$template = static::getTemplatePath() . '/qti.' . static::$qtiTagName . '.tpl.php';
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if (!file_exists($template)) {
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$template = static::getTemplatePath() . '/qti.element.tpl.php';
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}
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return $template;
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}
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/**
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* Get the variables to be used in the qti.xml template
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*
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* @return array
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*/
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protected function getTemplateQtiVariables()
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{
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$variables = [];
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$variables['tag'] = static::$qtiTagName;
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$variables['attributes'] = $this->getAttributeValues();
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if ($this instanceof FlowContainer) {
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$variables['body'] = $this->getBody()->toQTI();
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}
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return $variables;
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}
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/**
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* Export the data to the QTI XML format
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*
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* @return string
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*/
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public function toQTI()
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{
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$template = static::getTemplateQti();
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$variables = $this->getTemplateQtiVariables();
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if (isset($variables['attributes'])) {
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$variables['attributes'] = $this->xmlizeOptions($variables['attributes'], true);
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}
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$tplRenderer = new taoItems_models_classes_TemplateRenderer($template, $variables);
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$returnValue = $tplRenderer->render();
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return (string) $returnValue;
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}
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/**
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* Get the array representation of the Qti Element.
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* Particularly helpful for data transformation, e.g. json
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*
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* @param $filterVariableContent
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* @param array $filtered
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* @return array
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*/
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public function toArray($filterVariableContent = false, &$filtered = [])
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{
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$data = [];
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$data['serial'] = $this->getSerial();
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$tag = $this->getQtiTag();
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if (!empty($tag)) {
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$data['qtiClass'] = $tag;
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}
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$attributes = $this->getAttributeValues();
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$data['attributes'] = empty($attributes) ? new StdClass() : $attributes;
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if ($this instanceof FlowContainer) {
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$data['body'] = $this->getBody()->toArray($filterVariableContent, $filtered);
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}
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if ($this->isDebug()) {
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//in debug mode, add debug data, such as the related item
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$data['debug'] = ['relatedItem' => is_null($this->getRelatedItem()) ? '' : $this->getRelatedItem()->getSerial()];
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}
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return $data;
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}
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/**
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* Get the main template directory
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*
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* @access public
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* @author Sam, <sam@taotesting.com>
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* @return string
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*/
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public static function getTemplatePath()
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{
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if (empty(self::$templatesPath)) {
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$dir = \common_ext_ExtensionsManager::singleton()->getExtensionById('taoQtiItem')->getDir();
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self::$templatesPath = $dir . 'model/qti/templates/';
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}
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$returnValue = self::$templatesPath;
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return (string) $returnValue;
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}
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/**
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* Set the item the current Qti Element belongs to.
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* The related item assignment is propagated to all containing Qti Element of the current one.
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* The "force" option allows changing the associated item (even if it has already been defined)
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*
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* @param \oat\taoQtiItem\model\qti\Item $item
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* @param boolean $force
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* @return boolean
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* @throws \oat\taoQtiItem\model\qti\exception\QtiModelException
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*/
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public function setRelatedItem(Item $item, $force = false)
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{
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$returnValue = false;
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if (!is_null($this->relatedItem) && $this->relatedItem->getSerial() == $item->getSerial()) {
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$returnValue = true; // identical
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} elseif (!$force && !is_null($this->relatedItem)) {
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throw new QtiModelException('attempt to change item reference for a QTI element');
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} else {
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// propagate the assignation of item to all included objects
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$reflection = new ReflectionClass($this);
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foreach ($reflection->getProperties() as $property) {
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if (!$property->isStatic() && !$property->isPrivate()) {
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$propertyName = $property->getName();
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$value = $this->$propertyName;
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if (is_array($value)) {
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foreach ($value as $subvalue) {
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if (is_object($subvalue) && $subvalue instanceof Element) {
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$subvalue->setRelatedItem($item);
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} elseif (is_object($subvalue) && $subvalue instanceof ResponseIdentifier) {
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// manage the reference of identifier
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$idenfierBaseType = $subvalue->getValue(true);
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if (!is_null($idenfierBaseType)) {
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$idenfierBaseType->getReferencedObject()->setRelatedItem($item);
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}
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}
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}
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} elseif (is_object($value) && $value instanceof Element) {
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$value->setRelatedItem($item);
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}
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}
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}
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// set item reference to current object
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$this->relatedItem = $item;
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$returnValue = true;
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}
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return $returnValue;
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}
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|
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/**
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* Recursively get all Qti Elements contained within the current Qti Element
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*
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* @param string $className
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* @return array
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*/
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|
public function getComposingElements($className = '')
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{
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$returnValue = [];
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if ($className === '') {
|
|
$className = 'oat\taoQtiItem\model\qti\Element';
|
|
}
|
|
|
|
$reflection = new ReflectionClass($this);
|
|
foreach ($reflection->getProperties() as $property) {
|
|
if (!$property->isStatic() && !$property->isPrivate()) {
|
|
$propertyName = $property->getName();
|
|
if ($propertyName != 'relatedItem') {
|
|
$value = $this->$propertyName;
|
|
if (is_array($value)) {
|
|
foreach ($value as $subvalue) {
|
|
if ($subvalue instanceof Element) {
|
|
if ($subvalue instanceof $className) {
|
|
$returnValue[$subvalue->getSerial()] = $subvalue;
|
|
}
|
|
$returnValue = array_merge($returnValue, $subvalue->getComposingElements($className));
|
|
}
|
|
}
|
|
} else {
|
|
if ($value instanceof Element) {
|
|
if ($value instanceof $className) {
|
|
if ($value->getSerial() != $this->getSerial()) {
|
|
$returnValue[$value->getSerial()] = $value;
|
|
}
|
|
}
|
|
$returnValue = array_merge($returnValue, $value->getComposingElements($className));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return $returnValue;
|
|
}
|
|
|
|
/**
|
|
* Get the Qti Item the current Qti Element belongs to
|
|
*
|
|
* @return \oat\taoQtiItem\model\qti\Item
|
|
*/
|
|
public function getRelatedItem()
|
|
{
|
|
return $this->relatedItem;
|
|
}
|
|
|
|
/**
|
|
* This method enables you to build a string of attributes for an xml node
|
|
* from the Qti Element attributes according to their types.
|
|
*
|
|
* @access protected
|
|
* @author Sam, <sam@taotesting.com>
|
|
* @param array formalOpts
|
|
* @param boolean recursive
|
|
* @return string
|
|
*/
|
|
protected function xmlizeOptions($formalOpts = [], $recursive = false)
|
|
{
|
|
$returnValue = (string) '';
|
|
if (!is_array($formalOpts)) {
|
|
throw new InvalidArgumentException('formalOpts must be an array, ' . gettype($formalOpts) . ' given');
|
|
}
|
|
|
|
$options = (!$recursive) ? $this->getAttributeValues() : $formalOpts;
|
|
foreach ($options as $key => $value) {
|
|
if (is_string($value) || is_numeric($value)) {
|
|
// str_replace is unicode safe...
|
|
$returnValue .= ' ' . $key . '="' . str_replace([
|
|
'&',
|
|
'<',
|
|
'>',
|
|
'\'',
|
|
'"'
|
|
], [
|
|
'&',
|
|
'<',
|
|
'>',
|
|
''',
|
|
'"'
|
|
], $value) . '"';
|
|
}
|
|
if (is_bool($value)) {
|
|
$returnValue .= ' ' . $key . '="' . (($value) ? 'true' : 'false') . '"';
|
|
}
|
|
if (is_array($value)) {
|
|
if (count($value) > 0) {
|
|
$keys = array_keys($value);
|
|
if (is_int($keys[0])) { // repeat the attribute key
|
|
$returnValue .= ' ' . $key . '="' . implode(' ', array_values($value)) . '"';
|
|
} else {
|
|
$returnValue .= $this->xmlizeOptions($value, true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return (string) $returnValue;
|
|
}
|
|
|
|
/**
|
|
* Obtain a serial for the instance of the class that implements the
|
|
*
|
|
* @access public
|
|
* @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
|
|
* @return string
|
|
*/
|
|
public function getSerial()
|
|
{
|
|
if (empty($this->serial)) {
|
|
$this->serial = $this->buildSerial();
|
|
}
|
|
$returnValue = $this->serial;
|
|
|
|
return (string) $returnValue;
|
|
}
|
|
|
|
/**
|
|
* create a unique serial number
|
|
*
|
|
* @access protected
|
|
* @author Sam, <sam@taotesting.com>
|
|
* @return string
|
|
*/
|
|
protected function buildSerial()
|
|
{
|
|
|
|
if ($this->isDebug()) {
|
|
//in debug mode, use more meaningful serials
|
|
$clazz = strtolower(get_class($this));
|
|
$prefix = substr($clazz, strpos($clazz, 'taoqtiitem\\model\\qti\\') + 21) . '_';
|
|
$serial = str_replace('.', '', uniqid($prefix, true));
|
|
$serial = str_replace('\\', '_', $serial);
|
|
} else {
|
|
//build a short unique id for memory saving
|
|
$serial = uniqid('i');
|
|
}
|
|
|
|
return (string) $serial;
|
|
}
|
|
|
|
protected function getArraySerializedElementCollection($elements, $filterVariableContent = false, &$filtered = [])
|
|
{
|
|
if (empty($elements)) {
|
|
$data = new stdClass();
|
|
} else {
|
|
$data = [];
|
|
foreach ($elements as $element) {
|
|
$data[$element->getSerial()] = $element->toArray($filterVariableContent, $filtered);
|
|
}
|
|
}
|
|
return $data;
|
|
}
|
|
|
|
protected function getArraySerializedPrimitiveCollection($elements)
|
|
{
|
|
|
|
if (empty($elements)) {
|
|
$data = new stdClass();
|
|
} else {
|
|
$data = [];
|
|
foreach ($elements as $key => $value) {
|
|
if (is_array($value)) {
|
|
$data[$key] = $this->getArraySerializedPrimitiveCollection($value);
|
|
} else {
|
|
$data[$key] = $value;
|
|
}
|
|
}
|
|
}
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* @deprecated we should not use global constant to debug classes
|
|
*/
|
|
private function isDebug(): bool
|
|
{
|
|
if (defined('DEBUG_MODE')) {
|
|
return DEBUG_MODE;
|
|
}
|
|
return false;
|
|
}
|
|
}
|