2 * Copyright 2005-2010 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.wamblee.security.authentication.jpa;
18 import java.util.List;
20 import java.util.TreeSet;
22 import javax.persistence.EntityManager;
23 import javax.persistence.TypedQuery;
25 import org.wamblee.persistence.JpaMergeSupport;
26 import org.wamblee.security.authentication.Group;
27 import org.wamblee.security.authentication.GroupSet;
30 * Group set backed by the database.
32 * @author Erik Brakkee
34 public class JpaGroupSet implements GroupSet {
36 private EntityManager em;
39 * Constructs the group set.
42 * Contextual reference to an entity manager.
44 public JpaGroupSet(EntityManager aEm) {
49 public boolean add(Group aGroup) {
50 assert aGroup.getPrimaryKey() == null;
51 if (contains(aGroup)) {
55 em.flush(); // to make sure the version is updated.
60 public boolean contains(Group aGroup) {
61 return find(aGroup.getName()) != null;
65 public Group find(String aName) {
66 TypedQuery<Group> query = em.createNamedQuery(Group.QUERY_FIND_BY_NAME,
68 query.setParameter(Group.NAME_PARAM, aName);
69 List<Group> groups = query.getResultList();
70 if (groups.size() > 1) {
71 throw new RuntimeException(
72 "More than one group with the same name '" + aName + "'");
75 if (groups.size() == 0) {
82 public void groupModified(Group aGroup) {
83 assert aGroup.getPrimaryKey() != null;
84 Group merged = em.merge(aGroup);
85 // Need to flush so that version of the merged instance is updated so we
87 // the updated version in the original group passed in. That allows the
89 // group object to continue to be used as a detached object.
91 JpaMergeSupport.merge(merged, aGroup);
95 public Set<Group> list() {
96 List<Group> groups = em.createNamedQuery(Group.QUERY_ALL_GROUPS,
97 Group.class).getResultList();
98 Set<Group> res = new TreeSet<Group>(groups);
103 public boolean remove(Group aGroup) {
104 Group group = find(aGroup.getName());
114 Long res = (Long) em.createNamedQuery(Group.QUERY_COUNT_GROUPS)
116 return res.intValue();