/** * <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.quality.analysis.manager;import org.apache.logging.log4j.Logger;import org.olat.basesecurity.model.IdentityRefImpl;import org.olat.basesecurity.model.OrganisationRefImpl;import org.olat.core.logging.Tracing;import org.olat.core.util.StringHelper;import org.olat.core.util.xml.XStreamHelper;import org.olat.modules.curriculum.model.CurriculumElementRefImpl;import org.olat.modules.curriculum.model.CurriculumElementTypeRefImpl;import org.olat.modules.curriculum.model.CurriculumRefImpl;import org.olat.modules.quality.analysis.AnalysisSearchParameter;import org.olat.modules.quality.analysis.GroupBy;import org.olat.modules.quality.analysis.MultiGroupBy;import org.olat.modules.quality.model.QualityDataCollectionRefImpl;import org.olat.modules.taxonomy.model.TaxonomyLevelRefImpl;import org.olat.repository.model.RepositoryEntryRefImpl;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.security.ExplicitTypePermission;/** *  * Initial date: 01.10.2018<br> * @author uhensler, urs.hensler@frentix.com, http://www.frentix.com * */public class AnalysisPresentationXStream {		private static final Logger log = Tracing.createLoggerFor(AnalysisPresentationXStream.class);		private static final XStream xstream = XStreamHelper.createXStreamInstance();	static {		Class<?>[] types = new Class[] {				MultiGroupBy.class, GroupBy.class, AnalysisSearchParameter.class, QualityDataCollectionRefImpl.class,				RepositoryEntryRefImpl.class, IdentityRefImpl.class, OrganisationRefImpl.class, CurriculumRefImpl.class,				CurriculumElementRefImpl.class, CurriculumElementTypeRefImpl.class, TaxonomyLevelRefImpl.class };		xstream.addPermission(new ExplicitTypePermission(types));		xstream.alias("multiGroupBy", MultiGroupBy.class);		xstream.alias("groupBy", GroupBy.class);		xstream.alias("AnalysisSearchParameter", AnalysisSearchParameter.class);		xstream.alias("QualityDataCollectionRef", QualityDataCollectionRefImpl.class);		xstream.alias("RepositoryEntryRef", RepositoryEntryRefImpl.class);		xstream.alias("IdentityRef", IdentityRefImpl.class);		xstream.alias("OrganisationRef", OrganisationRefImpl.class);		xstream.alias("CurriculumRef", CurriculumRefImpl.class);		xstream.alias("CurriculumElementRef", CurriculumElementRefImpl.class);		xstream.alias("CurriculumElementTypeRef", CurriculumElementTypeRefImpl.class);		xstream.alias("TaxonomyLevelRef", TaxonomyLevelRefImpl.class);	}		static String toXml(Object obj) {		if (obj == null) return null;				return xstream.toXML(obj);	}		@SuppressWarnings("unchecked")	public static <U> U fromXml(String xml, @SuppressWarnings("unused") Class<U> cl) {		if(StringHelper.containsNonWhitespace(xml)) {			try {				Object obj = xstream.fromXML(xml);				return (U)obj;			} catch (Exception e) {				log.error("", e);			}		}		return null;	}}