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VersionUtil xref
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1   package org.apache.archiva.common.utils;
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.commons.lang.StringUtils;
23  
24  import java.util.regex.Matcher;
25  import java.util.regex.Pattern;
26  
27  /**
28   * Version utility methods.
29   */
30  public class VersionUtil
31  {
32      /**
33       * These are the version patterns found in the filenames of the various artifact's versions IDs.
34       * These patterns are all tackling lowercase version IDs.
35       */
36      private static final String versionPatterns[] =
37          new String[]{ "([0-9][_.0-9a-z]*)", "(snapshot)", "(g?[_.0-9ab]*(pre|rc|g|m)[_.0-9]*)", "(dev[_.0-9]*)",
38              "(alpha[_.0-9]*)", "(beta[_.0-9]*)", "(rc[_.0-9]*)",
39  //        "(test[_.0-9]*)", -- omitted for MRM-681, can be reinstated as part of MRM-712
40              "(debug[_.0-9]*)", "(unofficial[_.0-9]*)", "(current)", "(latest)", "(fcs)", "(release[_.0-9]*)",
41              "(nightly)", "(final)", "(incubating)", "(incubator)", "([ab][_.0-9]+)" };
42  
43      public static final String SNAPSHOT = "SNAPSHOT";
44  
45      public static final Pattern UNIQUE_SNAPSHOT_PATTERN = Pattern.compile( "^(.*)-([0-9]{8}\\.[0-9]{6})-([0-9]+)$" );
46  
47      public static final Pattern TIMESTAMP_PATTERN = Pattern.compile( "^([0-9]{8})\\.([0-9]{6})$" );
48  
49      public static final Pattern GENERIC_SNAPSHOT_PATTERN = Pattern.compile( "^(.*)-" + SNAPSHOT );
50  
51      private static final Pattern VERSION_MEGA_PATTERN =
52          Pattern.compile( StringUtils.join( versionPatterns, '|' ), Pattern.CASE_INSENSITIVE );
53  
54      /**
55       * <p>
56       * Tests if the unknown string contains elements that identify it as a version string (or not).
57       * </p>
58       *
59       * <p>
60       * The algorithm tests each part of the string that is delimited by a '-' (dash) character.
61       * If 75% or more of the sections are identified as 'version' strings, the result is
62       * determined to be of a high probability to be version identifier string.
63       * </p>
64       *
65       * @param unknown the unknown string to test.
66       * @return true if the unknown string is likely a version string.
67       */
68      public static boolean isVersion( String unknown )
69      {
70          String versionParts[] = StringUtils.split( unknown, '-' );
71  
72          Matcher mat;
73  
74          int countValidParts = 0;
75  
76          for ( int i = 0; i < versionParts.length; i++ )
77          {
78              String part = versionParts[i];
79              mat = VERSION_MEGA_PATTERN.matcher( part );
80  
81              if ( mat.matches() )
82              {
83                  if ( i == 0 ) // loosen rule to return true if first token matches
84                  {
85                      return true;
86                  }
87                  countValidParts++;
88              }
89          }
90  
91          /* Calculate version probability as true if 3/4's of the input string has pieces of
92           * of known version identifier strings.
93           */
94          int threshold = (int) Math.floor( Math.max( (double) 1.0, (double) ( versionParts.length * 0.75 ) ) );
95  
96          return ( countValidParts >= threshold );
97      }
98  
99      /**
100      * <p>
101      * Tests if the identifier is a known simple version keyword.
102      * </p>
103      *
104      * <p>
105      * This method is different from {@link #isVersion(String)} in that it tests the whole input string in
106      * one go as a simple identifier. (eg "alpha", "1.0", "beta", "debug", "latest", "rc#", etc...)
107      * </p>
108      *
109      * @param identifier the identifier to test.
110      * @return true if the unknown string is likely a version string.
111      */
112     public static boolean isSimpleVersionKeyword( String identifier )
113     {
114         Matcher mat = VERSION_MEGA_PATTERN.matcher( identifier );
115 
116         return mat.matches();
117     }
118 
119     public static boolean isSnapshot( String version )
120     {
121         Matcher m = UNIQUE_SNAPSHOT_PATTERN.matcher( version );
122         if ( m.matches() )
123         {
124             return true;
125         }
126         else
127         {
128             return isGenericSnapshot( version );
129         }
130     }
131 
132     public static String getBaseVersion( String version )
133     {
134         Matcher m = UNIQUE_SNAPSHOT_PATTERN.matcher( version );
135         if ( m.matches() )
136         {
137             return m.group( 1 ) + "-" + SNAPSHOT;
138         }
139         else
140         {
141             return version;
142         }
143     }
144 
145     /**
146      * <p>
147      * Get the release version of the snapshot version.
148      * </p>
149      * 
150      * <p>
151      * If snapshot version is 1.0-SNAPSHOT, then release version would be 1.0
152      * And if snapshot version is 1.0-20070113.163208-1.jar, then release version would still be 1.0
153      * </p>
154      *
155      * @param snapshotVersion snapshot version
156      * @return release version
157      */
158     public static String getReleaseVersion( String snapshotVersion )
159     {
160         Matcher m = UNIQUE_SNAPSHOT_PATTERN.matcher( snapshotVersion );
161 
162         if ( isGenericSnapshot( snapshotVersion ) )
163         {
164             m = GENERIC_SNAPSHOT_PATTERN.matcher( snapshotVersion );
165         }
166 
167         if ( m.matches() )
168         {
169             return m.group( 1 );
170         }
171         else
172         {
173             return snapshotVersion;
174         }
175     }
176 
177     public static boolean isUniqueSnapshot( String version )
178     {
179         Matcher m = UNIQUE_SNAPSHOT_PATTERN.matcher( version );
180         return m.matches();
181     }
182 
183     public static boolean isGenericSnapshot( String version )
184     {
185         return version.endsWith( SNAPSHOT );
186     }
187 
188     public static String getVersionFromGenericSnapshot( String version )
189     {
190         Matcher m = GENERIC_SNAPSHOT_PATTERN.matcher( version );
191         if ( m.matches() )
192         {
193             return m.group( 1 );
194         }
195         return version;
196     }
197 }