1 package nl.tudelft.simulation.naming.context;
2
3 import java.io.BufferedInputStream;
4 import java.io.File;
5 import java.io.FileInputStream;
6 import java.io.ObjectInputStream;
7 import java.net.URI;
8 import java.util.Hashtable;
9
10 import org.djutils.logger.CategoryLogger;
11
12 /**
13 * A factory for FileContext instances, automatically invoked by JNDI when the correct jndi.properties file has been used.
14 * <p>
15 * Copyright (c) 2002-2025 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
16 * for project information <a href="https://simulation.tudelft.nl/dsol/manual/" target="_blank">DSOL Manual</a>. The DSOL
17 * project is distributed under a three-clause BSD-style license, which can be found at
18 * <a href="https://simulation.tudelft.nl/dsol/docs/latest/license.html" target="_blank">DSOL License</a>.
19 * </p>
20 * @author <a href="https://www.linkedin.com/in/peterhmjacobs">Peter Jacobs </a>
21 * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
22 */
23 public class FileContextFactory implements ContextFactory
24 {
25 /** context refers to the static JvmContext. */
26 private static FileContext context = null;
27
28 @Override
29 public synchronized ContextInterface getInitialContext(final Hashtable<?, ?> environment, final String atomicName)
30 {
31 if (context == null)
32 {
33 try
34 {
35 URI fileURI = new URI(environment.get("java.naming.provider.url").toString());
36 File file = new File(fileURI);
37 if (file.exists())
38 {
39 ObjectInputStream stream = new ObjectInputStream(new BufferedInputStream(new FileInputStream(file)));
40 FileContextFactory.context = (FileContext) stream.readObject();
41 stream.close();
42 }
43 else
44 {
45 FileContextFactory.context = new FileContext(file, atomicName);
46 }
47 }
48 catch (Exception exception)
49 {
50 CategoryLogger.always().error(exception, "getInitialContext");
51 }
52 }
53 return context;
54 }
55 }