1 /**
2 * This file Copyright (c) 2017-2018 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.templating.inspector;
35
36 import info.magnolia.templating.inspector.spi.ValueFormatter;
37
38 import java.util.ServiceLoader;
39
40 /**
41 * Service that looks up for {@link ValueFormatter}s and a {@link ServiceLoader} and eventually handles creation
42 * of the {@link ValueFormatter} for the desired type.
43 */
44 public final class ValueFormatterService {
45
46 private static ValueFormatterService service;
47
48 private final ServiceLoader<ValueFormatter> loader;
49
50 private ValueFormatterService() {
51 loader = ServiceLoader.load(ValueFormatter.class);
52 }
53
54 public static synchronized ValueFormatterService getInstance() {
55 if (service == null) {
56 service = new ValueFormatterService();
57 }
58 return service;
59 }
60
61 public ValueFormatter<?> getValueFormatterFor(Object source) {
62 for (ValueFormatter formatter : loader) {
63 if (formatter.canHandle(source.getClass())) {
64 formatter.setValue(source);
65 return formatter;
66 }
67 }
68 return null;
69 }
70 }