Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
JarBytecodeHashAnalyzer |
|
| 2.3333333333333335;2.333 |
1 | package org.apache.maven.shared.jar.identification.hash; | |
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 org.apache.maven.shared.jar.JarAnalyzer; | |
23 | import org.apache.maven.shared.jar.JarData; | |
24 | import org.codehaus.plexus.digest.DigesterException; | |
25 | import org.codehaus.plexus.digest.StreamingDigester; | |
26 | import org.codehaus.plexus.logging.AbstractLogEnabled; | |
27 | import org.codehaus.plexus.util.IOUtil; | |
28 | ||
29 | import java.io.IOException; | |
30 | import java.io.InputStream; | |
31 | import java.util.Iterator; | |
32 | import java.util.jar.JarEntry; | |
33 | ||
34 | /** | |
35 | * Analyzer that calculates the hash code for the entire file. Can be used to detect an exact copy of the file's class | |
36 | * data. Useful to see thru a recompile, recompression, or timestamp change. | |
37 | * <p/> | |
38 | * If you are not using Plexus, you must call {@link #setDigester(org.codehaus.plexus.digest.StreamingDigester)} before use | |
39 | * | |
40 | * @plexus.component role="org.apache.maven.shared.jar.identification.hash.JarHashAnalyzer" role-hint="bytecode" | |
41 | */ | |
42 | 0 | public class JarBytecodeHashAnalyzer |
43 | extends AbstractLogEnabled | |
44 | implements JarHashAnalyzer | |
45 | { | |
46 | /** | |
47 | * The streaming digester to use for computing the hash. Under Plexus, the default is SHA-1. | |
48 | * | |
49 | * @plexus.requirement role-hint="sha1" | |
50 | */ | |
51 | private StreamingDigester digester; | |
52 | ||
53 | public String computeHash( JarAnalyzer jarAnalyzer ) | |
54 | { | |
55 | 0 | JarData jarData = jarAnalyzer.getJarData(); |
56 | ||
57 | 0 | String result = jarData.getBytecodeHash(); |
58 | 0 | if ( result == null ) |
59 | { | |
60 | 0 | Iterator it = jarAnalyzer.getClassEntries().iterator(); |
61 | ||
62 | try | |
63 | { | |
64 | 0 | digester.reset(); |
65 | 0 | while ( it.hasNext() ) |
66 | { | |
67 | 0 | JarEntry entry = (JarEntry) it.next(); |
68 | 0 | computeEntryBytecodeHash( jarAnalyzer.getEntryInputStream( entry ) ); |
69 | 0 | } |
70 | 0 | result = digester.calc(); |
71 | 0 | jarData.setBytecodeHash( result ); |
72 | } | |
73 | 0 | catch ( DigesterException e ) |
74 | { | |
75 | 0 | getLogger().warn( "Unable to calculate the hashcode.", e ); |
76 | } | |
77 | 0 | catch ( IOException e ) |
78 | { | |
79 | 0 | getLogger().warn( "Unable to calculate the hashcode.", e ); |
80 | 0 | } |
81 | } | |
82 | 0 | return result; |
83 | } | |
84 | ||
85 | private void computeEntryBytecodeHash( InputStream is ) | |
86 | throws IOException, DigesterException | |
87 | { | |
88 | try | |
89 | { | |
90 | 0 | digester.update( is ); |
91 | } | |
92 | finally | |
93 | { | |
94 | 0 | IOUtil.close( is ); |
95 | 0 | } |
96 | 0 | } |
97 | ||
98 | public void setDigester( StreamingDigester digester ) | |
99 | { | |
100 | 0 | this.digester = digester; |
101 | 0 | } |
102 | } |