1 /*
2 * ModeShape (http://www.modeshape.org)
3 * See the COPYRIGHT.txt file distributed with this work for information
4 * regarding copyright ownership. Some portions may be licensed
5 * to Red Hat, Inc. under one or more contributor license agreements.
6 * See the AUTHORS.txt file in the distribution for a full listing of
7 * individual contributors.
8 *
9 * ModeShape is free software. Unless otherwise indicated, all code in ModeShape
10 * is licensed to you under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation; either version 2.1 of
12 * the License, or (at your option) any later version.
13 *
14 * ModeShape is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this software; if not, write to the Free
21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
23 */
24 package org.modeshape.connector.store.jpa.util;
25
26 import java.util.HashMap;
27 import java.util.Map;
28 import javax.persistence.EntityManager;
29 import net.jcip.annotations.NotThreadSafe;
30 import org.modeshape.connector.store.jpa.model.common.NamespaceEntity;
31
32 /**
33 * A utility that wraps the {@link NamespaceEntity} objects appearing within an {@link EntityManager}.
34 */
35 @NotThreadSafe
36 public class Namespaces {
37
38 private final EntityManager entityManager;
39 private final Map<String, NamespaceEntity> cache = new HashMap<String, NamespaceEntity>();
40
41 public Namespaces( EntityManager manager ) {
42 this.entityManager = manager;
43 }
44
45 public NamespaceEntity get( String namespaceUri,
46 boolean createIfRequired ) {
47 NamespaceEntity entity = cache.get(namespaceUri);
48 if (entity == null) {
49 entity = NamespaceEntity.findByUri(entityManager, namespaceUri, createIfRequired);
50 if (entity != null) {
51 cache.put(namespaceUri, entity);
52 }
53 }
54 return entity;
55 }
56 }