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.Digester;
25 import org.codehaus.plexus.digest.DigesterException;
26 import org.codehaus.plexus.logging.AbstractLogEnabled;
27
28 /**
29 * Analyzer that calculates the hash code for the entire file. Can be used to detect an exact copy of the file.
30 * <p/>
31 * If you are not using Plexus, you must call {@link #setDigester(org.codehaus.plexus.digest.Digester)} before use
32 *
33 * @plexus.component role="org.apache.maven.shared.jar.identification.hash.JarHashAnalyzer" role-hint="file"
34 */
35 public class JarFileHashAnalyzer
36 extends AbstractLogEnabled
37 implements JarHashAnalyzer
38 {
39 /**
40 * The digester to use for computing the hash. Under Plexus, the default is SHA-1.
41 *
42 * @plexus.requirement role-hint="sha1"
43 */
44 private Digester digester;
45
46 public String computeHash( JarAnalyzer jarAnalyzer )
47 {
48 JarData jarData = jarAnalyzer.getJarData();
49
50 String result = jarData.getFileHash();
51 if ( result == null )
52 {
53 try
54 {
55 result = digester.calc( jarData.getFile() );
56 jarData.setFileHash( result );
57 }
58 catch ( DigesterException e )
59 {
60 getLogger().warn( "Unable to calculate the hashcode.", e );
61 }
62 }
63 return result;
64 }
65
66 public void setDigester( Digester digester )
67 {
68 this.digester = digester;
69 }
70 }