/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <hr>
* <a href="http://www.openolat.org">
* OpenOLAT - Online Learning and Training</a><br>
* This file has been modified by the OpenOLAT community. Changes are licensed
* under the Apache 2.0 license as the original file.
*/
package org.olat.ims.qti.fileresource;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Attribute;
import org.olat.core.CoreSpringFactory;
import org.olat.core.logging.OLog;
import org.olat.core.logging.Tracing;
import org.olat.core.util.PathUtils;
import org.olat.core.util.vfs.LocalFileImpl;
import org.olat.core.util.vfs.LocalFolderImpl;
import org.olat.core.util.vfs.VFSContainer;
import org.olat.core.util.vfs.VFSItem;
import org.olat.fileresource.types.FileResource;
import org.olat.fileresource.types.ResourceEvaluation;
import org.olat.ims.qti.process.AssessmentInstance;
import org.olat.ims.qti.process.QTIHelper;
import de.bps.onyx.plugin.OnyxModule;
/**
* Initial Date: Apr 6, 2004
*
* @author Mike Stock
*/
public class SurveyFileResource extends FileResource {
private static final OLog log = Tracing.createLoggerFor(SurveyFileResource.class);
private static final String QTI_FILE = "qti.xml";
/**
* IMS QTI Survey file resource identifier.
*/
public static final String TYPE_NAME = "FileResource.SURVEY";
public SurveyFileResource() {
super(TYPE_NAME);
}
/**
* @param unzippedDir
* @return True if is of type.
*/
public static boolean validate(File unzippedDir) {
if (CoreSpringFactory.getImpl(OnyxModule.class).isEnabled() && OnyxModule.isOnyxTest(unzippedDir)) {
return true;
}
//with VFS FIXME:pb:c: remove casts to LocalFileImpl and LocalFolderImpl if no longer needed.
VFSContainer vfsUnzippedRoot = new LocalFolderImpl(unzippedDir);
VFSItem vfsQTI = vfsUnzippedRoot.resolve("qti.xml");
//getDocument(..) ensures that InputStream is closed in every case.
Document doc = QTIHelper.getDocument((LocalFileImpl) vfsQTI);
return validateQti(doc, new ResourceEvaluation(false)).isValid();
}
public static ResourceEvaluation evaluate(File file, String filename) {
ResourceEvaluation eval = new ResourceEvaluation();
try {
QTIFileFilter visitor = new QTIFileFilter();
Path fPath = PathUtils.visit(file, filename, visitor);
if(visitor.isValid()) {
Path qtiPath = fPath.resolve(QTI_FILE);
Document doc = QTIHelper.getDocument(qtiPath);
validateQti(doc, eval);
} else {
eval.setValid(false);
}
} catch (IOException | IllegalArgumentException e) {
log.error("", e);
eval.setValid(false);
}
return eval;
}
private static ResourceEvaluation validateQti(Document doc, ResourceEvaluation eval) {
if (doc == null) {
eval.setValid(false);
} else {
List assessment = doc.selectNodes("questestinterop/assessment");
if(assessment.size() == 1) {
Object assessmentObj = assessment.get(0);
if(assessmentObj instanceof Element) {
Element assessmentEl = (Element)assessmentObj;
Attribute title = assessmentEl.attribute("title");
if(title != null) {
eval.setDisplayname(title.getValue());
}
List metas = assessmentEl.selectNodes("qtimetadata/qtimetadatafield");
for (Iterator iter = metas.iterator(); iter.hasNext();) {
Element el_metafield = (Element) iter.next();
Element el_label = (Element) el_metafield.selectSingleNode("fieldlabel");
String label = el_label.getText();
if (label.equals(AssessmentInstance.QMD_LABEL_TYPE)) { // type meta
Element el_entry = (Element) el_metafield.selectSingleNode("fieldentry");
String entry = el_entry.getText();
if(entry.equals(AssessmentInstance.QMD_ENTRY_TYPE_SURVEY)) {
eval.setValid(true);
}
}
}
}
}
}
return eval;
}
private static class QTIFileFilter extends SimpleFileVisitor<Path> {
private boolean qtiFile;
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
throws IOException {
String filename = file.getFileName().toString();
if(QTI_FILE.equals(filename)) {
qtiFile = true;
}
return qtiFile ? FileVisitResult.TERMINATE : FileVisitResult.CONTINUE;
}
public boolean isValid() {
return qtiFile;
}
}
}