1 package org.codehaus.mojo.siteskinner;
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.File;
23 import java.io.FilenameFilter;
24 import java.io.IOException;
25 import java.net.MalformedURLException;
26 import java.net.URL;
27 import java.util.Properties;
28
29 import org.apache.maven.project.MavenProject;
30 import org.codehaus.plexus.util.StringUtils;
31
32 /**
33 * Based on the SelectorUtils from the maven-invoker-plugin
34 *
35 * @author Robert Scholte
36 * @since 1.1
37 */
38 public final class SelectorUtils
39 {
40
41 private SelectorUtils()
42 {
43 }
44
45 /**
46 * Retrieves the current Maven version.
47 * @return The current Maven version.
48 */
49 static String getMavenVersion()
50 {
51 try
52 {
53 // This relies on the fact that MavenProject is the in core classloader
54 // and that the core classloader is for the maven-core artifact
55 // and that should have a pom.properties file
56 // if this ever changes, we will have to revisit this code.
57 Properties properties = new Properties();
58 properties.load( MavenProject.class.getClassLoader().getResourceAsStream(
59 "META-INF/maven/org.apache.maven/maven-core/pom.properties" ) );
60 return StringUtils.trim( properties.getProperty( "version" ) );
61 }
62 catch ( Exception e )
63 {
64 return null;
65 }
66 }
67
68 static String getMavenVersion( File mavenHome )
69 {
70 File mavenLib = new File( mavenHome, "lib" );
71 File[] jarFiles = mavenLib.listFiles( new FilenameFilter()
72 {
73 public boolean accept( File dir, String name )
74 {
75 return name.endsWith( ".jar" );
76 }
77 } );
78
79 for ( File file : jarFiles )
80 {
81 try
82 {
83 @SuppressWarnings( "deprecation" )
84 URL url =
85 new URL( "jar:" + file.toURL().toExternalForm()
86 + "!/META-INF/maven/org.apache.maven/maven-core/pom.properties" );
87
88 Properties properties = new Properties();
89 properties.load( url.openStream() );
90 String version = StringUtils.trim( properties.getProperty( "version" ) );
91 if ( version != null )
92 {
93 return version;
94 }
95 }
96 catch ( MalformedURLException e )
97 {
98 // ignore
99 }
100 catch ( IOException e )
101 {
102 // ignore
103 }
104 }
105 return null;
106 }
107 }