1 /*
2 * JasperReports - Free Java Reporting Library.
3 * Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
4 * http://www.jaspersoft.com
5 *
6 * Unless you have purchased a commercial license agreement from Jaspersoft,
7 * the following license terms apply:
8 *
9 * This program is part of JasperReports.
10 *
11 * JasperReports is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * JasperReports is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
23 */
24 package net.sf.jasperreports.extensions;
25
26 import java.util.ArrayList;
27 import java.util.HashMap;
28 import java.util.List;
29 import java.util.Map;
30
31 /**
32 * An extension registry that contains several lists of extensions.
33 *
34 * @author Lucian Chirita (lucianc@users.sourceforge.net)
35 */
36 public class ListExtensionsRegistry implements ExtensionsRegistry
37 {
38
39 private final Map<Class<?>, List<Object>> extensions;
40
41 public ListExtensionsRegistry()
42 {
43 extensions = new HashMap<Class<?>, List<Object>>();
44 }
45
46 /**
47 * Adds an extension.
48 *
49 * @param type the extension type
50 * @param extension the extension object
51 * @return this object
52 */
53 public <T> ListExtensionsRegistry add(Class<T> type, T extension)
54 {
55 List<Object> list = extensions.get(type);
56 if (list == null)
57 {
58 list = new ArrayList<Object>();
59 extensions.put(type, list);
60 }
61
62 list.add(extension);
63 return this;
64 }
65
66 @Override
67 public <T> List<T> getExtensions(Class<T> extensionType)
68 {
69 @SuppressWarnings("unchecked")
70 List<T> list = (List<T>) extensions.get(extensionType);
71 return list;
72 }
73
74 }
75