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211 lines
7.0 KiB
211 lines
7.0 KiB
<?php //$id:$
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/**
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* Container for the scormResource class
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* @package scorm.learnpath
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* @author Yannick Warnier <ywarnier@beeznest.org>
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*/
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/**
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* Class defining the <resource> tag in an imsmanifest.xml file
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*
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*/
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class scormResource {
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var $identifier = '';
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var $type = 'webcontent';
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//var $identifierref = '';
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var $scormtype = 'sco'; //fix problems with ENI content where asset is not defined
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var $base = '';
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var $href = '';
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var $metadata;
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//var $file_href;
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//var $file_metadata;
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var $files = array();
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var $dependencies = array();
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/**
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* Class constructor. Depending of the type of construction called ('db' or 'manifest'), will create a scormResource
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* object from database records or from the DOM element given as parameter
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* @param string Type of construction needed ('db' or 'manifest', default = 'manifest')
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* @param mixed Depending on the type given, DB id for the lp_item or reference to the DOM element
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*/
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function scormResource($type='manifest',&$element) {
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/*
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echo "<pre>Analysing resource:<br />\n";
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var_dump($element);
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echo "</pre><br />\n";
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*/
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if(isset($element))
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{
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$v = substr(phpversion(),0,1);
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if($v == 4){
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switch($type){
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case 'db':
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//TODO implement this way of metadata object creation
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return false;
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case 'manifest': //do the same as the default
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default:
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//if($first_item->type == XML_ELEMENT_NODE) this is already check prior to the call to this function
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$children = $element->children();
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foreach($children as $a => $dummy)
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{
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$child =& $children[$a];
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switch($child->type)
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{
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case XML_ELEMENT_NODE:
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switch($child->tagname){
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case 'file':
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//echo "Child is a file tag<br />\n";
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$this->files[] = $child->get_attribute('href');
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//var_dump($this->files);
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//ignoring file metadata
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//files[] array contains all <file href='x'> tags one by one
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break;
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case 'metadata':
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//echo "Child is a metadata tag<br />\n";
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$this->metadata = new scormMetadata('manifest',$child);
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break;
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case 'dependency':
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//echo "Child is a dependency tag<br />\n";
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//need to get identifierref attribute inside dependency node
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//dependencies[] array represents all <dependency identifierref='x'> tags united
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$this->dependencies[] = $child->get_attribute('identifierref');
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break;
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}
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break;
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}
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}
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$attributes = $element->attributes();
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//$keep_href = '';
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if(count($attributes)>0){ //in some cases we get here with an empty attributes array
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//TODO find when and why we get such a case (empty array)
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foreach($attributes as $a1 => $dummy)
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{
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$attrib =& $attributes[$a1];
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switch($attrib->name){
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case 'identifier':
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$this->identifier = $attrib->value;
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break;
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case 'type':
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if(!empty($attrib->value)){
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$this->type = $attrib->value;
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}
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break;
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case 'scormtype':
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if(!empty($attrib->value)){
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$this->scormtype = $attrib->value;
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}
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break;
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case 'base':
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$this->base = $attrib->value;
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break;
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case 'href':
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$this->href = $attrib->value;
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break;
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}
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}
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}
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return true;
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}
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}elseif($v == 5){
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//parsing using PHP5 DOMXML methods
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switch($type){
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case 'db':
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//TODO implement this way of metadata object creation
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return false;
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case 'manifest': //do the same as the default
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default:
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//if($first_item->type == XML_ELEMENT_NODE) this is already check prior to the call to this function
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$children = $element->childNodes;
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if(is_array($children)){
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foreach($children as $child)
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{
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switch($child->nodeType)
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{
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case XML_ELEMENT_NODE:
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switch($child->tagName){
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case 'file':
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//echo "Child is a file tag<br />\n";
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$this->files[] = $child->getAttribute('href');
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break;
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case 'metadata':
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//echo "Child is a metadata tag<br />\n";
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$this->metadata = new scormMetadata('manifest',$child);
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break;
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case 'dependency':
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//need to get identifierref attribute inside dependency node
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//dependencies[] array represents all <dependency identifierref='x'> tags united
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$this->dependencies[] = $child->getAttribute('identifierref');
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break;
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}
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break;
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}
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}
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}
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//$keep_href = '';
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if($element->hasAttributes()){ //in some cases we get here with an empty attributes array
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//TODO find when and why we get such a case (empty array)
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$attributes = $element->attributes;
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foreach($attributes as $attrib)
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{
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switch($attrib->name){
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case 'identifier':
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$this->identifier = $attrib->value;
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break;
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case 'type':
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if(!empty($attrib->value)){
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$this->type = $attrib->value;
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}
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break;
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case 'scormtype':
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if(!empty($attrib->value)){
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$this->scormtype = $attrib->value;
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}
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break;
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case 'base':
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$this->base = $attrib->value;
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break;
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case 'href':
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$this->href = $attrib->value;
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break;
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}
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}
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}
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return true;
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}
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}else{
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//cannot parse because not PHP4 nor PHP5... We should not even be here anyway...
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return false;
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}
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}
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return false;
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}
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/**
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* Path getter
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* @return string Path for this resource
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*/
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function get_path()
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{
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if(!empty($this->href))
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{
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require_once('learnpath.class.php');
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return learnpath::escape_string($this->href);
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}else{
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return '';
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}
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}
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/**
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* Scorm type getter
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* @return string generally 'asset' or 'sco' as these are the only two values defined in SCORM 1.2
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*/
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function get_scorm_type()
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{
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if(!empty($this->scormtype)){
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require_once('learnpath.class.php');
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return learnpath::escape_string($this->scormtype);
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}else{
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return '';
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}
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}
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}
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?>
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