/**
* Enables you to build the QTI_Resources from a manifest xml data node
* Content Packaging 1.1)
*
* @access public
* @author Joel Bout, <*****@*****.**>
* @param SimpleXMLElement source
* @return array
* @see http://www.imsglobal.org/question/qti_v2p0/imsqti_intgv2p0.html#section10003
*/
public static function getResourcesFromManifest(SimpleXMLElement $source)
{
$returnValue = array();
//check of the root tag
if ($source->getName() != 'manifest') {
throw new ParsingException("incorrect manifest root tag");
}
$resourceNodes = $source->xpath("//*[name(.)='resource']");
foreach ($resourceNodes as $resourceNode) {
$type = (string) $resourceNode['type'];
if (Resource::isAssessmentItem($type)) {
$id = (string) $resourceNode['identifier'];
$href = isset($resourceNode['href']) ? (string) $resourceNode['href'] : '';
$auxFiles = array();
//parse for auxiliary files
foreach ($resourceNode->file as $fileNode) {
$fileHref = (string) $fileNode['href'];
if ($href != $fileHref) {
$auxFiles[] = $fileHref;
}
}
//include dependency files in item
foreach ($resourceNode->dependency as $dependencyNode) {
$ref = (string) $dependencyNode['identifierref'];
//find referenced files within the current manifest:
$refResourceNodes = $source->xpath("//*[name(.)='resource' and @identifier='" . $ref . "']");
foreach ($refResourceNodes as $refResourceNode) {
if (isset($refResourceNode['href'])) {
$auxFiles[] = (string) $refResourceNode['href'];
}
}
}
$resource = new Resource($id, $type, $href);
$resource->setAuxiliaryFiles($auxFiles);
$returnValue[] = $resource;
}
}
return (array) $returnValue;
}
/**
* Import a QTI Test and its dependent Items into the TAO Platform.
*
* @param core_kernel_classes_Class $targetClass The RDFS Class where Ontology resources must be created.
* @param oat\taoQtiItem\model\qti\Resource $qtiTestResource The QTI Test Resource representing the IMS QTI Test to be imported.
* @param taoQtiTest_models_classes_ManifestParser $manifestParser The parser used to retrieve the IMS Manifest.
* @param string $folder The absolute path to the folder where the IMS archive containing the test content
* @return common_report_Report A report about how the importation behaved.
*/
protected function importTest(core_kernel_classes_Class $targetClass, Resource $qtiTestResource, taoQtiTest_models_classes_ManifestParser $manifestParser, $folder)
{
$itemImportService = ImportService::singleton();
$itemService = taoItems_models_classes_ItemsService::singleton();
$testClass = $targetClass;
// Create an RDFS resource in the knowledge base that will hold
// the information about the imported QTI Test.
$testResource = $this->createInstance($testClass);
$qtiTestModelResource = new core_kernel_classes_Resource(INSTANCE_TEST_MODEL_QTI);
$modelProperty = new core_kernel_classes_Property(PROPERTY_TEST_TESTMODEL);
$testResource->editPropertyValues($modelProperty, $qtiTestModelResource);
// Create the report that will hold information about the import
// of $qtiTestResource in TAO.
$report = new common_report_Report(common_report_Report::TYPE_INFO);
// The class where the items that belong to the test will be imported.
$itemClass = new core_kernel_classes_Class(TAO_ITEM_CLASS);
$targetClass = $itemClass->createSubClass($testResource->getLabel());
// Load and validate the manifest
$qtiManifestParser = new taoQtiTest_models_classes_ManifestParser($folder . 'imsmanifest.xml');
$qtiManifestParser->validate();
// Prepare Metadata mechanisms.
$metadataMapping = oat\taoQtiItem\model\qti\Service::singleton()->getMetadataRegistry()->getMapping();
$metadataInjectors = array();
$metadataGuardians = array();
$metadataClassLookups = array();
$metadataValues = array();
$domManifest = new DOMDocument('1.0', 'UTF-8');
$domManifest->load($folder . 'imsmanifest.xml');
foreach ($metadataMapping['injectors'] as $injector) {
$metadataInjectors[] = new $injector();
}
foreach ($metadataMapping['guardians'] as $guardian) {
$metadataGuardians[] = new $guardian();
}
foreach ($metadataMapping['classLookups'] as $classLookup) {
$metadataClassLookups[] = new $classLookup();
}
foreach ($metadataMapping['extractors'] as $extractor) {
$metadataExtractor = new $extractor();
$metadataValues = array_merge($metadataValues, $metadataExtractor->extract($domManifest));
}
// Set up $report with useful information for client code (especially for rollback).
$reportCtx = new stdClass();
$reportCtx->manifestResource = $qtiTestResource;
$reportCtx->rdfsResource = $testResource;
$reportCtx->itemClass = $targetClass;
$reportCtx->items = array();
$report->setData($reportCtx);
// Expected test.xml file location.
$expectedTestFile = $folder . str_replace('/', DIRECTORY_SEPARATOR, $qtiTestResource->getFile());
// Already imported test items (qti xml file paths).
$alreadyImportedTestItemFiles = array();
// -- Check if the file referenced by the test QTI resource exists.
if (is_readable($expectedTestFile) === false) {
$report->add(common_report_Report::createFailure(__('No file found at location "%s".', $qtiTestResource->getFile())));
} else {
// -- Load the test in a QTISM flavour.
$testDefinition = new XmlDocument();
try {
$testDefinition->load($expectedTestFile, true);
// -- Load all items related to test.
$itemError = false;
// discover test's base path.
$dependencies = taoQtiTest_helpers_Utils::buildAssessmentItemRefsTestMap($testDefinition, $manifestParser, $folder);
if (count($dependencies['items']) > 0) {
foreach ($dependencies['items'] as $assessmentItemRefId => $qtiDependency) {
if ($qtiDependency !== false) {
if (Resource::isAssessmentItem($qtiDependency->getType())) {
$resourceIdentifier = $qtiDependency->getIdentifier();
// Check if the item is already stored in the bank.
foreach ($metadataGuardians as $guardian) {
if (isset($metadataValues[$resourceIdentifier]) === true) {
if (($guard = $guardian->guard($metadataValues[$resourceIdentifier])) !== false) {
common_Logger::i("Item with identifier '{$resourceIdentifier}' already in Item Bank.");
$msg = __('The IMS QTI Item referenced as "%s" in the IMS Manifest file was already stored in the Item Bank.', $resourceIdentifier);
$report->add(common_report_Report::createInfo($msg, $guard));
$reportCtx->items[$assessmentItemRefId] = $guard;
// Simply do not import again.
continue 2;
}
}
}
// Determine target class from metadata, if possible.
// This is applied to items, not for test definitions.
// The test definitions' target class will not be affected
// by class lookups.
$lookupTargetClass = false;
foreach ($metadataClassLookups as $classLookup) {
if (isset($metadataValues[$resourceIdentifier]) === true) {
if (($lookupTargetClass = $classLookup->lookup($metadataValues[$resourceIdentifier])) !== false) {
break;
}
}
}
$qtiFile = $folder . str_replace('/', DIRECTORY_SEPARATOR, $qtiDependency->getFile());
// Skip if $qtiFile already imported (multiple assessmentItemRef "hrefing" the same file).
if (array_key_exists($qtiFile, $alreadyImportedTestItemFiles) === false) {
$isApip = $qtiDependency->getType() === 'imsqti_apipitem_xmlv2p1';
$itemReport = $itemImportService->importQtiItem($folder, $qtiDependency, $lookupTargetClass !== false ? $lookupTargetClass : $targetClass, $isApip, $dependencies['dependencies']);
$rdfItem = $itemReport->getData();
if ($rdfItem) {
$reportCtx->items[$assessmentItemRefId] = $rdfItem;
$alreadyImportedTestItemFiles[$qtiFile] = $rdfItem;
$itemReport->setMessage(__('IMS QTI Item referenced as "%s" in the IMS Manifest file successfully imported.', $qtiDependency->getIdentifier()));
} else {
$itemReport->setType(common_report_Report::TYPE_ERROR);
$itemReport->setMessage(__('IMS QTI Item referenced as "%s" in the IMS Manifest file could not be imported.', $qtiDependency->getIdentifier()));
$itemError = $itemError === false ? true : $itemError;
}
$report->add($itemReport);
} else {
$reportCtx->items[$assessmentItemRefId] = $alreadyImportedTestItemFiles[$qtiFile];
}
}
} else {
$msg = __('The dependency to the IMS QTI AssessmentItemRef "%s" in the IMS Manifest file could not be resolved.', $assessmentItemRefId);
$report->add(common_report_Report::createFailure($msg));
$itemError = $itemError === false ? true : $itemError;
}
}
// If items did not produce errors, we import the test definition.
if ($itemError === false) {
common_Logger::i('Importing test...');
// Second step is to take care of the test definition and the related media (auxiliary files).
// 1. Import test definition (i.e. the QTI-XML Test file).
$testContent = $this->importTestDefinition($testResource, $testDefinition, $qtiTestResource, $reportCtx->items, $folder, $report);
if ($testContent !== false) {
// 2. Import test auxilliary files (e.g. stylesheets, images, ...).
$this->importTestAuxiliaryFiles($testContent, $qtiTestResource, $folder, $report);
// 3. Give meaningful names to resources.
$testTitle = $testDefinition->getDocumentComponent()->getTitle();
$testResource->setLabel($testDefinition->getDocumentComponent()->getTitle());
$targetClass->setLabel($testDefinition->getDocumentComponent()->getTitle());
// 4. if $targetClass does not contain any instances (because everything resolved by class lookups),
// Just delete it.
if ($targetClass->countInstances() == 0) {
$targetClass->delete();
}
}
} else {
$msg = __("One or more dependent IMS QTI Items could not be imported.");
$report->add(common_report_Report::createFailure($msg));
}
} else {
// No depencies found (i.e. no item resources bound to the test).
$msg = __("No reference to any IMS QTI Item found.");
$report->add(common_report_Report::createFailure($msg));
}
} catch (StorageException $e) {
// Source of the exception = $testDefinition->load()
// What is the reason ?
$finalErrorString = '';
$eStrs = array();
if (($libXmlErrors = $e->getErrors()) !== null) {
foreach ($libXmlErrors as $libXmlError) {
$eStrs[] = __('XML error at line %1$d column %2$d "%3$s".', $libXmlError->line, $libXmlError->column, trim($libXmlError->message));
}
}
$finalErrorString = implode("\n", $eStrs);
if (empty($finalErrorString) === true) {
// Not XML malformation related. No info from LibXmlErrors extracted.
if (($previous = $e->getPrevious()) != null) {
// Useful information could be found here.
$finalErrorString = $previous->getMessage();
if ($previous instanceof UnmarshallingException) {
$domElement = $previous->getDOMElement();
$finalErrorString = __('Inconsistency at line %1d:', $domElement->getLineNo()) . ' ' . $previous->getMessage();
}
} else {
$finalErrorString = __("Unknown error.");
}
}
$msg = __("Error found in the IMS QTI Test:\n%s", $finalErrorString);
$report->add(common_report_Report::createFailure($msg));
}
}
if ($report->containsError() === false) {
$report->setType(common_report_Report::TYPE_SUCCESS);
$msg = __("IMS QTI Test referenced as \"%s\" in the IMS Manifest file successfully imported.", $qtiTestResource->getIdentifier());
$report->setMessage($msg);
} else {
$report->setType(common_report_Report::TYPE_ERROR);
$msg = __("The IMS QTI Test referenced as \"%s\" in the IMS Manifest file could not be imported.", $qtiTestResource->getIdentifier());
$report->setMessage($msg);
}
return $report;
}
/**
* Import a QTI Test and its dependent Items into the TAO Platform.
*
* @param core_kernel_classes_Class $targetClass The RDFS Class where Ontology resources must be created.
* @param oat\taoQtiItem\model\qti\Resource $qtiTestResource The QTI Test Resource representing the IMS QTI Test to be imported.
* @param taoQtiTest_models_classes_ManifestParser $manifestParser The parser used to retrieve the IMS Manifest.
* @param string $folder The absolute path to the folder where the IMS archive containing the test content
* @return common_report_Report A report about how the importation behaved.
*/
protected function importTest(core_kernel_classes_Class $targetClass, Resource $qtiTestResource, taoQtiTest_models_classes_ManifestParser $manifestParser, $folder)
{
$itemImportService = ImportService::singleton();
$itemService = taoItems_models_classes_ItemsService::singleton();
$testClass = $targetClass;
// Create an RDFS resource in the knowledge base that will hold
// the information about the imported QTI Test.
$testResource = $this->createInstance($testClass);
$qtiTestModelResource = new core_kernel_classes_Resource(INSTANCE_TEST_MODEL_QTI);
$modelProperty = new core_kernel_classes_Property(PROPERTY_TEST_TESTMODEL);
$testResource->editPropertyValues($modelProperty, $qtiTestModelResource);
// Create the report that will hold information about the import
// of $qtiTestResource in TAO.
$report = new common_report_Report(common_report_Report::TYPE_INFO);
// The class where the items that belong to the test will be imported.
$itemClass = new core_kernel_classes_Class(TAO_ITEM_CLASS);
$targetClass = $itemClass->createSubClass($testResource->getLabel());
// Load and validate the manifest
$qtiManifestParser = new taoQtiTest_models_classes_ManifestParser($folder . 'imsmanifest.xml');
$qtiManifestParser->validate();
// Set up $report with useful information for client code (especially for rollback).
$reportCtx = new stdClass();
$reportCtx->manifestResource = $qtiTestResource;
$reportCtx->rdfsResource = $testResource;
$reportCtx->itemClass = $targetClass;
$reportCtx->items = array();
$report->setData($reportCtx);
// Expected test.xml file location.
$expectedTestFile = $folder . str_replace('/', DIRECTORY_SEPARATOR, $qtiTestResource->getFile());
// Already imported test items (qti xml file paths).
$alreadyImportedTestItemFiles = array();
// -- Check if the file referenced by the test QTI resource exists.
if (is_readable($expectedTestFile) === false) {
$report->add(common_report_Report::createFailure(__('No file found at location "%s".', $qtiTestResource->getFile())));
} else {
// -- Load the test in a QTISM flavour.
$testDefinition = new XmlDocument();
try {
$testDefinition->load($expectedTestFile, true);
// -- Load all items related to test.
$itemError = false;
// discover test's base path.
$dependencies = taoQtiTest_helpers_Utils::buildAssessmentItemRefsTestMap($testDefinition, $manifestParser, $folder);
if (count($dependencies) > 0) {
foreach ($dependencies as $assessmentItemRefId => $qtiDependency) {
if ($qtiDependency !== false) {
if (Resource::isAssessmentItem($qtiDependency->getType())) {
$qtiFile = $folder . str_replace('/', DIRECTORY_SEPARATOR, $qtiDependency->getFile());
// Skip if $qtiFile already imported (multiple assessmentItemRef "hrefing" the same file).
if (array_key_exists($qtiFile, $alreadyImportedTestItemFiles) === false) {
$itemReport = $itemImportService->importQTIFile($qtiFile, $targetClass);
$rdfItem = $itemReport->getData();
if ($rdfItem) {
$itemPath = taoItems_models_classes_ItemsService::singleton()->getItemFolder($rdfItem);
foreach ($qtiDependency->getAuxiliaryFiles() as $auxResource) {
// $auxResource is a relativ URL, so we need to replace the slashes with directory separators
$auxPath = $folder . str_replace('/', DIRECTORY_SEPARATOR, $auxResource);
// does the file referenced by $auxPath exist?
if (is_readable($auxPath) === true) {
$relPath = helpers_File::getRelPath($qtiFile, $auxPath);
$destPath = $itemPath . $relPath;
tao_helpers_File::copy($auxPath, $destPath, true);
} else {
$msg = __('Auxiliary file not found at location "%s".', $auxResource);
$itemReport->add(new common_report_Report(common_report_Report::TYPE_WARNING, $msg));
}
}
$reportCtx->items[$assessmentItemRefId] = $rdfItem;
$alreadyImportedTestItemFiles[$qtiFile] = $rdfItem;
$itemReport->setMessage(__('IMS QTI Item referenced as "%s" in the IMS Manifest file successfully imported.', $qtiDependency->getIdentifier()));
} else {
$itemReport->setType(common_report_Report::TYPE_ERROR);
$itemReport->setMessage(__('IMS QTI Item referenced as "%s" in the IMS Manifest file could not be imported.', $qtiDependency->getIdentifier()));
$itemError = $itemError === false ? true : $itemError;
}
$report->add($itemReport);
} else {
$reportCtx->items[$assessmentItemRefId] = $alreadyImportedTestItemFiles[$qtiFile];
}
}
} else {
$msg = __('The dependency to the IMS QTI AssessmentItemRef "%s" in the IMS Manifest file could not be resolved.', $assessmentItemRefId);
$report->add(common_report_Report::createFailure($msg));
$itemError = $itemError === false ? true : $itemError;
}
}
// If items did not produce errors, we import the test definition.
if ($itemError === false) {
common_Logger::i('Importing test...');
// Second step is to take care of the test definition and the related media (auxiliary files).
// 1. Import test definition (i.e. the QTI-XML Test file).
$testContent = $this->importTestDefinition($testResource, $testDefinition, $qtiTestResource, $reportCtx->items, $folder, $report);
if ($testContent !== false) {
// 2. Import test auxilliary files (e.g. stylesheets, images, ...).
$this->importTestAuxiliaryFiles($testContent, $qtiTestResource, $folder, $report);
// 3. Give meaningful names to resources.
$testTitle = $testDefinition->getDocumentComponent()->getTitle();
$testResource->setLabel($testDefinition->getDocumentComponent()->getTitle());
$targetClass->setLabel($testDefinition->getDocumentComponent()->getTitle());
}
} else {
$msg = __("One or more dependent IMS QTI Items could not be imported.");
$report->add(common_report_Report::createFailure($msg));
}
} else {
// No depencies found (i.e. no item resources bound to the test).
$msg = __("No reference to any IMS QTI Item found.");
$report->add(common_report_Report::createFailure($msg));
}
} catch (StorageException $e) {
// Source of the exception = $testDefinition->load()
// What is the reason ?
$finalErrorString = '';
$eStrs = array();
if (($libXmlErrors = $e->getErrors()) !== null) {
foreach ($libXmlErrors as $libXmlError) {
$eStrs[] = __('XML error at line %1$d column %2$d "%3$s".', $libXmlError->line, $libXmlError->column, trim($libXmlError->message));
}
}
$finalErrorString = implode("\n", $eStrs);
if (empty($finalErrorString) === true) {
// Not XML malformation related. No info from LibXmlErrors extracted.
if (($previous = $e->getPrevious()) != null) {
// Useful information could be found here.
$finalErrorString = $previous->getMessage();
if ($previous instanceof UnmarshallingException) {
$domElement = $previous->getDOMElement();
$finalErrorString = __('Inconsistency at line %1d:', $domElement->getLineNo()) . ' ' . $previous->getMessage();
}
} else {
$finalErrorString = __("Unknown error.");
}
}
$msg = __("Error found in the IMS QTI Test:\n%s", $finalErrorString);
$report->add(common_report_Report::createFailure($msg));
}
}
if ($report->containsError() === false) {
$report->setType(common_report_Report::TYPE_SUCCESS);
$msg = __("IMS QTI Test referenced as \"%s\" in the IMS Manifest file successfully imported.", $qtiTestResource->getIdentifier());
$report->setMessage($msg);
} else {
$report->setType(common_report_Report::TYPE_ERROR);
$msg = __("The IMS QTI Test referenced as \"%s\" in the IMS Manifest file could not be imported.", $qtiTestResource->getIdentifier());
$report->setMessage($msg);
}
return $report;
}
