/** * <a href="http://www.openolat.org"> * OpenOLAT - Online Learning and Training</a><br> * <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 the * <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache homepage</a> * <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> * Initial code contributed and copyrighted by<br> * frentix GmbH, http://www.frentix.com * <p> */package org.olat.modules.qpool.manager;import java.util.List;import org.olat.core.commons.persistence.DB;import org.apache.logging.log4j.Logger;import org.olat.core.logging.Tracing;import org.olat.core.util.StringHelper;import org.olat.core.util.xml.XStreamHelper;import org.olat.modules.qpool.QuestionItem;import org.olat.modules.qpool.QuestionItemAuditLog;import org.olat.modules.qpool.QuestionItemShort;import org.olat.modules.qpool.model.QEducationalContext;import org.olat.modules.qpool.model.QItemType;import org.olat.modules.qpool.model.QLicense;import org.olat.modules.qpool.model.QuestionItemImpl;import org.olat.modules.taxonomy.model.TaxonomyLevelImpl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.thoughtworks.xstream.XStream;/** *  * Initial date: 21.01.2018<br> * @author uhensler, urs.hensler@frentix.com, http://www.frentix.com * */@Servicepublic class QuestionItemAuditLogDAO {		private static final Logger log = Tracing.createLoggerFor(QuestionItemAuditLogDAO.class);		private static final XStream qitemXStream = XStreamHelper.createXStreamInstanceForDBObjects();	static {		XStreamHelper.allowDefaultPackage(qitemXStream);		qitemXStream.alias("questionItem", QuestionItemImpl.class);		qitemXStream.alias("taxonomyLevel", TaxonomyLevelImpl.class);		qitemXStream.alias("educationalContext", QEducationalContext.class);		qitemXStream.alias("type", QItemType.class);		qitemXStream.alias("license", QLicense.class);		qitemXStream.ignoreUnknownElements();		qitemXStream.omitField(QuestionItemImpl.class, "creationDate");		qitemXStream.omitField(QuestionItemImpl.class, "lastModified");		qitemXStream.omitField(QuestionItemImpl.class, "ownerGroup");		qitemXStream.omitField(TaxonomyLevelImpl.class, "creationDate");		qitemXStream.omitField(TaxonomyLevelImpl.class, "lastModified");		qitemXStream.omitField(TaxonomyLevelImpl.class, "taxonomy");		qitemXStream.omitField(TaxonomyLevelImpl.class, "parent");		qitemXStream.omitField(TaxonomyLevelImpl.class, "type");		qitemXStream.omitField(QEducationalContext.class, "creationDate");		qitemXStream.omitField(QEducationalContext.class, "lastModified");		qitemXStream.omitField(QItemType.class, "creationDate");		qitemXStream.omitField(QItemType.class, "lastModified");		qitemXStream.omitField(QLicense.class, "creationDate");		qitemXStream.omitField(QLicense.class, "lastModified");	}		@Autowired	private DB dbInstance;		public void persist(QuestionItemAuditLog auditLog) {		dbInstance.getCurrentEntityManager().persist(auditLog);	}	public List<QuestionItemAuditLog> getAuditLogByQuestionItem(QuestionItemShort item) {		StringBuilder sb = new StringBuilder(128);		sb.append("select log from qitemauditlog log where log.questionItemKey=:questionItemKey");		return dbInstance.getCurrentEntityManager()				.createQuery(sb.toString(), QuestionItemAuditLog.class)				.setParameter("questionItemKey", item.getKey())				.getResultList();	}		public String toXml(QuestionItem item) {		if(item == null) return null;		return qitemXStream.toXML(item);	}		public QuestionItem questionItemFromXml(String xml) {		QuestionItem item = null;		if(StringHelper.containsNonWhitespace(xml)) {			try {				Object obj = qitemXStream.fromXML(xml);				if(obj instanceof QuestionItem) {					item = (QuestionItem) obj;				}			} catch (Exception e) {				log.error("", e);			}		}		return item;	}}