1 // ******************************************************************************
2 //
3 // Title: Force Field X.
4 // Description: Force Field X - Software for Molecular Biophysics.
5 // Copyright: Copyright (c) Michael J. Schnieders 2001-2025.
6 //
7 // This file is part of Force Field X.
8 //
9 // Force Field X is free software; you can redistribute it and/or modify it
10 // under the terms of the GNU General Public License version 3 as published by
11 // the Free Software Foundation.
12 //
13 // Force Field X is distributed in the hope that it will be useful, but WITHOUT
14 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 // FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
16 // details.
17 //
18 // You should have received a copy of the GNU General Public License along with
19 // Force Field X; if not, write to the Free Software Foundation, Inc., 59 Temple
20 // Place, Suite 330, Boston, MA 02111-1307 USA
21 //
22 // Linking this library statically or dynamically with other modules is making a
23 // combined work based on this library. Thus, the terms and conditions of the
24 // GNU General Public License cover the whole combination.
25 //
26 // As a special exception, the copyright holders of this library give you
27 // permission to link this library with independent modules to produce an
28 // executable, regardless of the license terms of these independent modules, and
29 // to copy and distribute the resulting executable under terms of your choice,
30 // provided that you also meet, for each linked independent module, the terms
31 // and conditions of the license of that module. An independent module is a
32 // module which is not derived from or based on this library. If you modify this
33 // library, you may extend this exception to your version of the library, but
34 // you are not obligated to do so. If you do not wish to do so, delete this
35 // exception statement from your version.
36 //
37 // ******************************************************************************
38 package ffx.ui.commands;
39
40 import java.net.URL;
41 import java.util.logging.Logger;
42 import org.xml.sax.EntityResolver;
43 import org.xml.sax.InputSource;
44
45 /**
46 * The DTDResolver class just points the DOM DocumentBuilder to the XML Document Type Definition
47 * (DTD) files.
48 *
49 * @author Michael J. Schnieders
50 */
51 public class DTDResolver implements EntityResolver {
52
53 private static final Logger logger = Logger.getLogger(DTDResolver.class.getName());
54
55 /** {@inheritDoc} */
56 public InputSource resolveEntity(String publicId, String systemId) {
57 if (systemId.lastIndexOf("keywords.dtd") >= 0) {
58 URL keyURL = getClass().getClassLoader().getResource("ffx/xml/keywords.dtd");
59 try {
60 return new InputSource(keyURL.openStream());
61 } catch (Exception e) {
62 logger.warning("" + e);
63 return null;
64 }
65 } else if (systemId.lastIndexOf("commands.dtd") >= 0) {
66 URL commandURL = getClass().getClassLoader().getResource("ffx/xml/commands.dtd");
67 try {
68 return new InputSource(commandURL.openStream());
69 } catch (Exception e) {
70 return null;
71 }
72 }
73 return null;
74 }
75 }