001/**
002 * Copyright 2005-2015 The Kuali Foundation
003 *
004 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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.kuali.rice.kim.impl.group;
017
018import org.apache.commons.collections.ListUtils;
019import org.apache.commons.lang.StringUtils;
020import org.kuali.rice.kew.api.KewApiServiceLocator;
021import org.kuali.rice.kew.api.KewApiConstants;
022import org.kuali.rice.kim.api.group.GroupService;
023import org.kuali.rice.kim.api.services.KimApiServiceLocator;
024import org.kuali.rice.krad.service.BusinessObjectService;
025import org.kuali.rice.krad.service.KRADServiceLocator;
026
027import java.util.ArrayList;
028import java.util.Collections;
029import java.util.HashSet;
030import java.util.List;
031import java.util.Set;
032
033/**
034 * Concrete Implementation of {@link GroupInternalService}
035 *
036 * @author Kuali Rice Team (rice.collab@kuali.org)
037 *
038 */
039public class GroupInternalServiceImpl implements GroupInternalService {
040    protected BusinessObjectService getBusinessObjectService() {
041        return KRADServiceLocator.getBusinessObjectService();
042    }
043
044
045    public GroupService getGroupService(){
046        return KimApiServiceLocator.getGroupService();
047    }
048
049    @Override
050    public GroupBo saveWorkgroup(GroupBo group) {
051        GroupService ims = getGroupService();
052        List<String> oldIds = Collections.emptyList();
053        if (StringUtils.isNotEmpty(group.getId())) {
054            oldIds = ims.getMemberPrincipalIds(group.getId());
055        }
056        group = (GroupBo)getBusinessObjectService().save( group );
057        List<String> newIds = ims.getMemberPrincipalIds(group.getId());
058        updateForWorkgroupChange(group.getId(), oldIds, newIds);
059        return group;
060    }
061
062    @Override
063    public void updateForWorkgroupChange(String groupId,
064                List<String> oldPrincipalIds, List<String> newPrincipalIds) {
065        MembersDiff membersDiff = getMembersDiff(oldPrincipalIds, newPrincipalIds);
066        for (String removedPrincipalId : membersDiff.getRemovedPrincipalIds()) {
067                updateForUserRemovedFromGroup(removedPrincipalId, groupId);
068        }
069        for (String addedPrincipalId : membersDiff.getAddedPrincipalIds()) {
070                updateForUserAddedToGroup(addedPrincipalId, groupId);
071        }
072    }
073
074    @Override
075    public void updateForUserAddedToGroup(String principalId, String groupId) {
076        // first verify that the user is still a member of the workgroup
077        if(getGroupService().isMemberOfGroup(principalId, groupId))
078        {
079            KewApiServiceLocator.getGroupMembershipChangeQueue()
080                .notifyMembershipChange(KewApiConstants.GroupMembershipChangeOperations.ADDED, groupId, principalId);
081        }
082    }
083
084    @Override
085    public void updateForUserRemovedFromGroup(String principalId, String groupId) {
086        // first verify that the user is no longer a member of the workgroup
087        if(!getGroupService().isMemberOfGroup(principalId, groupId))
088        {
089            KewApiServiceLocator.getGroupMembershipChangeQueue()
090                .notifyMembershipChange(KewApiConstants.GroupMembershipChangeOperations.REMOVED, groupId, principalId);
091        }
092
093    }
094
095    private MembersDiff getMembersDiff(List<String> oldMemberPrincipalIds, List<String> newMemberPrincipalIds) {
096
097        // ListUtils does not check the null case.  Which can happen when adding a new group
098        // so, if they're null make them empty lists.
099        if(oldMemberPrincipalIds == null) oldMemberPrincipalIds = new ArrayList<String>();
100        if(newMemberPrincipalIds == null) newMemberPrincipalIds = new ArrayList<String>();
101
102        Set<String> addedPrincipalIds = new HashSet<String>(ListUtils.subtract(newMemberPrincipalIds, oldMemberPrincipalIds));
103        Set<String> removedPrincipalIds = new HashSet<String>(ListUtils.subtract(oldMemberPrincipalIds, newMemberPrincipalIds));
104        return new MembersDiff(addedPrincipalIds, removedPrincipalIds);
105    }
106
107    private class MembersDiff {
108        private final Set<String> addedPrincipalIds;
109
110        private final Set<String> removedPrincipalIds;
111
112        public MembersDiff(Set<String> addedPrincipalIds, Set<String>removedPrincipalIds) {
113            this.addedPrincipalIds = addedPrincipalIds;
114            this.removedPrincipalIds = removedPrincipalIds;
115        }
116
117        public Set<String> getAddedPrincipalIds() {
118            return addedPrincipalIds;
119        }
120
121        public Set<String> getRemovedPrincipalIds() {
122            return removedPrincipalIds;
123        }
124    }
125
126}