001/*
002 *  Copyright 2018 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;
017
018import java.util.Arrays;
019import java.util.HashMap;
020import java.util.LinkedHashSet;
021import java.util.Map;
022import java.util.Set;
023
024import org.apache.avalon.framework.service.ServiceException;
025import org.apache.avalon.framework.service.ServiceManager;
026import org.apache.avalon.framework.service.Serviceable;
027import org.apache.commons.lang3.ArrayUtils;
028
029import org.ametys.cms.ObservationConstants;
030import org.ametys.cms.repository.Content;
031import org.ametys.cms.workflow.ContentWorkflowHelper;
032import org.ametys.core.observation.Event;
033import org.ametys.core.observation.ObservationManager;
034import org.ametys.core.observation.Observer;
035import org.ametys.core.user.CurrentUserProvider;
036import org.ametys.odf.course.Course;
037import org.ametys.odf.coursepart.CoursePart;
038import org.ametys.runtime.plugin.component.AbstractLogEnabled;
039
040/**
041 * Observer to unlink a {@link CoursePart} on {@link Course} deletion.
042 */
043public class CourseDeletedObserver extends AbstractLogEnabled implements Observer, Serviceable
044{
045    private ObservationManager _observationManager;
046    private CurrentUserProvider _userProvider;
047    private ContentWorkflowHelper _contentWorkflowHelper;
048
049    @Override
050    public void service(ServiceManager manager) throws ServiceException
051    {
052        _observationManager = (ObservationManager) manager.lookup(ObservationManager.ROLE);
053        _userProvider = (CurrentUserProvider) manager.lookup(CurrentUserProvider.ROLE);
054        _contentWorkflowHelper = (ContentWorkflowHelper) manager.lookup(ContentWorkflowHelper.ROLE);
055    }
056    
057    @Override
058    public boolean supports(Event event)
059    {
060        if (event.getId().equals(ObservationConstants.EVENT_CONTENT_DELETING))
061        {
062            Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
063            return content instanceof Course;
064        }
065        
066        return false;
067    }
068
069    @Override
070    public int getPriority(Event event)
071    {
072        return 0;
073    }
074
075    @Override
076    public void observe(Event event, Map<String, Object> transientVars) throws Exception
077    {
078        Course course = (Course) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
079        for (CoursePart coursePart : course.getCourseParts())
080        {
081            String[] courses = coursePart.getMetadataHolder().getStringArray(CoursePart.METADATA_PARENT_COURSES, ArrayUtils.EMPTY_STRING_ARRAY);
082            Set<String> newCourses = new LinkedHashSet<>();
083            newCourses.addAll(Arrays.asList(courses));
084            newCourses.remove(course.getId());
085            coursePart.getMetadataHolder().setMetadata(CoursePart.METADATA_PARENT_COURSES, newCourses.toArray(new String[0]));
086            coursePart.saveChanges();
087            
088            // Notify listeners
089            Map<String, Object> eventParams = new HashMap<>();
090            eventParams.put(ObservationConstants.ARGS_CONTENT, coursePart);
091            eventParams.put(ObservationConstants.ARGS_CONTENT_ID, coursePart.getId());
092            _observationManager.notify(new Event(ObservationConstants.EVENT_CONTENT_MODIFIED, _userProvider.getUser(), eventParams));
093           
094            _contentWorkflowHelper.doAction(coursePart, 22);
095        }
096    }
097
098}