1 /**
2 * This file Copyright (c) 2016-2017 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.resourceloader.classpath.service.impl;
35
36 import java.io.IOException;
37 import java.io.InputStream;
38 import java.net.JarURLConnection;
39 import java.net.URLConnection;
40
41 import org.slf4j.Logger;
42 import org.slf4j.LoggerFactory;
43
44 /**
45 * Utility class for {@link URLConnection}. Primarily provides an approach to gracefully close an instance of {@link URLConnection}
46 * (i.e. make sure the connection's input stream is closed).
47 */
48 public class URLConnectionUtil {
49
50 private static final Logger log = LoggerFactory.getLogger(URLConnectionUtil.class);
51
52 public static void closeURLConnection(URLConnection urlConnection) {
53 if (urlConnection == null) {
54 return;
55 }
56
57 if (urlConnection instanceof JarURLConnection) {
58 JarURLConnection jar = (JarURLConnection) urlConnection;
59 try {
60 jar.getJarFile().close();
61 } catch (Exception ignored) {
62 // JarURLConnection is affected by https://bugs.openjdk.java.net/browse/JDK-8080094
63 }
64 } else {
65 try {
66 InputStream inputStream = urlConnection.getInputStream();
67 if (inputStream != null) {
68 inputStream.close();
69 }
70 } catch (IOException e) {
71 log.debug("Failed to close URL connection's [{}] input stream due to: {}", urlConnection.getURL().getPath(), e.getMessage(), e);
72 }
73 }
74
75 }
76 }