# CommunitySpaceRemovingListener.java

    /*
     * Copyright (C) 2000 - 2024 Silverpeas
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * As a special exception to the terms and conditions of version 3.0 of
     * the GPL, you may redistribute this Program in connection with Free/Libre
     * Open Source Software ("FLOSS") applications as described in Silverpeas's
     * FLOSS exception.  You should have received a copy of the text describing
     * the FLOSS exception, and it is also available here:
     * "http://www.silverpeas.com/legal/licensing"
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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    package org.silverpeas.components.community.model;

    import org.silverpeas.components.community.repository.CommunityMembershipRepository;
    import org.silverpeas.components.community.repository.CommunityOfUsersRepository;
    import org.silverpeas.core.admin.service.Administration;
    import org.silverpeas.core.admin.space.notification.SpaceEvent;
    import org.silverpeas.core.annotation.Bean;
    import org.silverpeas.core.notification.system.CDIResourceEventListener;
    import org.silverpeas.core.persistence.Transaction;
    import org.silverpeas.kernel.annotation.Technical;

    import javax.inject.Inject;

    /**
     * When a community space is removed, id est moved into the administrative bin, all the user
     * profiles of this space are automatically deleted and cannot then be restored. As such, the
     * existing members of the space are considered then to be also deleted. Thus, the members group
     * have to be also deleted, as well as the memberships of the community of users.
     *
     * @author mmoquillon
     */
    @Technical
    @Bean
    class CommunitySpaceRemovingListener extends CDIResourceEventListener<SpaceEvent> {

      @Inject
      private Administration administration;

      @Inject
      private CommunityOfUsersRepository communityRepository;

      @Inject
      private CommunityMembershipRepository membershipRepository;

      @Override
      public void onRemoving(SpaceEvent event) {
        var space = event.getTransition().getBefore();
        var community = CommunityOfUsers.getBySpaceId(space.getId());
        community
            .filter(c -> c.groupId != null)
            .ifPresent(c -> {
              String groupId = String.valueOf(c.groupId);
              c.groupId = null;

              Transaction.performInOne(() -> {
                communityRepository.save(c);
                // to ensure the members group referred by the community is well removed  before
                // deleting the referenced group
                communityRepository.flush();
                // clean up the memberships to this community
                membershipRepository.getMembershipsTable(c).deleteAll();
                // then delete the group
                administration.deleteGroupById(groupId, true);
                return null;
              });
            });
      }
    }