1 /*
2 * Copyright (c) 2012-2022, jcabi.com
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met: 1) Redistributions of source code must retain the above
8 * copyright notice, this list of conditions and the following
9 * disclaimer. 2) Redistributions in binary form must reproduce the above
10 * copyright notice, this list of conditions and the following
11 * disclaimer in the documentation and/or other materials provided
12 * with the distribution. 3) Neither the name of the jcabi.com nor
13 * the names of its contributors may be used to endorse or promote
14 * products derived from this software without specific prior written
15 * permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
19 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28 * OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 package com.jcabi.manifests;
31
32 import com.jcabi.log.Logger;
33 import java.io.IOException;
34 import java.io.InputStream;
35 import java.net.URL;
36 import java.util.ArrayList;
37 import java.util.Collection;
38 import javax.servlet.ServletContext;
39
40 /**
41 * Manifests in servlet context.
42 *
43 * Append attributes from the web application {@code MANIFEST.MF}.
44 *
45 * <p>You can use this class in your own
46 * {@link javax.servlet.Filter} or
47 * {@link javax.servlet.ServletContextListener},
48 * in order to inject {@code MANIFEST.MF} attributes to the class:
49 *
50 * <pre> Manifests.append(new ServletMfs(context));</pre>
51 *
52 * <p>The class is thread-safe.
53 *
54 * @since 1.0
55 */
56 public final class ServletMfs implements Mfs {
57
58 /**
59 * Servlet context.
60 */
61 private final transient ServletContext ctx;
62
63 /**
64 * Ctor.
65 * @param context Context
66 */
67 public ServletMfs(final ServletContext context) {
68 this.ctx = context;
69 }
70
71 @Override
72 public Collection<InputStream> fetch() throws IOException {
73 final URL main = this.ctx.getResource("/META-INF/MANIFEST.MF");
74 final Collection<InputStream> streams = new ArrayList<>(1);
75 if (main == null) {
76 Logger.warn(this, "MANIFEST.MF not found in WAR package");
77 } else {
78 streams.add(main.openStream());
79 }
80 return streams;
81 }
82
83 }