1 package org.codehaus.plexus.languages.java.jpms;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.io.IOException;
23 import java.io.InputStream;
24 import java.nio.file.Files;
25 import java.nio.file.Path;
26 import java.util.jar.JarFile;
27 import java.util.jar.Manifest;
28
29 /**
30 * Extracts the name of the module by reading the Automatic-Module-Name attribute of the manifest file
31 *
32 * @author Robert Scholte
33 * @since 1.0.0
34 */
35 class ManifestModuleNameExtractor implements ModuleNameExtractor {
36 @Override
37 public String extract(Path file) throws IOException {
38 Manifest manifest = extractManifest(file);
39
40 String automaticModuleName;
41 if (manifest != null) {
42 automaticModuleName = manifest.getMainAttributes().getValue("Automatic-Module-Name");
43 } else {
44 automaticModuleName = null;
45 }
46
47 return automaticModuleName;
48 }
49
50 private Manifest extractManifest(Path file) throws IOException {
51 Manifest manifest;
52 if (Files.isRegularFile(file)) {
53 try (JarFile jarFile = new JarFile(file.toFile())) {
54 manifest = jarFile.getManifest();
55 }
56 } else if (Files.exists(file.resolve("META-INF/MANIFEST.MF"))) {
57 try (InputStream is = Files.newInputStream(file.resolve("META-INF/MANIFEST.MF"))) {
58 manifest = new Manifest(is);
59 }
60 } else {
61 manifest = null;
62 }
63
64 return manifest;
65 }
66 }