001/*
002 *  Copyright 2025 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.odf.observation.skill;
017
018import java.util.Arrays;
019import java.util.List;
020import java.util.Map;
021import java.util.Optional;
022
023import org.ametys.cms.ObservationConstants;
024import org.ametys.cms.data.ContentValue;
025import org.ametys.cms.repository.Content;
026import org.ametys.core.observation.Event;
027
028/**
029 * Observer to delete skills that became orphans after the deletion of their parent.
030 * When the deleted content is a Program, delete the linked macro skills that would become orphans
031 *    The deletion of macro skills will trigger the deletion of its micro skills
032 * When the deleted content is a Macro skill, delete the linked micro skills that would become orphans
033 */
034public class DeleteContentSkillObserver extends AbstractSkillsObserver
035{
036    @Override
037    protected String getSupportedEventId()
038    {
039        return ObservationConstants.EVENT_CONTENT_DELETING;
040    }
041    
042    public void observe(Event event, Map<String, Object> transientVars) throws Exception
043    {
044        Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
045
046        // When the parent content is deleted, we need to delete the orphan skills
047        ContentValue[] skills = _getSkills(content);
048        if (skills != null && skills.length > 0)
049        {
050            List<Content> skillsToDelete = Arrays.stream(skills)
051                // Only retrieve still existing contents
052                .map(contentValue -> contentValue.getContentIfExists())
053                // Filter out null values
054                .filter(Optional::isPresent)
055                .map(Optional::get)
056                .map(skillToDeleteContent -> (Content) skillToDeleteContent)
057                .toList();
058    
059            if (!skillsToDelete.isEmpty())
060            {
061                // Remove the orphan skills
062                _contentDAO.forceDeleteContentsObj(skillsToDelete, null);
063            }
064        }
065    }
066}