README.md


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205


    Contents⊕
  
  
  CLI
  
  Diff
  Check
  Infer
  Validate
  
  Enforcer Rule
  
  Checking a project's
  compatibility
  Checking a project's
  version
  
  API overview
  Maven dependency
  

Semantic Versioning is a Java library allowing to validate if library
version numbers follows Semantic Versioning principles as defined by [http://semver.org](Semantic Versioning).

Project version number changes implication are not always clearly
identified. Will this patch released be safe to use in my project? Does
this minor version increment implies my implementation of some API is no
more complete?
Semantic Versioning can check JAR files to identify breaking changes
between versions and identify if your version number is correct
according to Semantic Versioning principles.
CLI
This simple command line tool looks at Java JAR files and determine
API changes. You might download self contained JAR file from github.
Diff
Dump all changes between two JARs on standard output.
% java -jar semver.jar previousJar currentJar (includes) (excludes)
Class org.project.MyClass
 Added Class 
Class org.project.MyClass2
 Added Method method1
 Removed Field field1
 Changed Field field2 removed: final
Check
Check compatibility type between two JARs.
% java -jar semver.jar previousJar currentJar (includes) (excludes)
BACKWARD_COMPATIBLE_IMPLEMENTER
Infer
Infer JAR version based on a previously versioned JAR.
% java -jar semver.jar previousVersion previousJar currentJar (includes) (excludes) 1.0.0
Validate
Validate JAR version based on a previously versioned JAR.
% java -jar semver.jar previousVersion previousJar currentVersion currentJar (includes) (excludes)
true
Enforcer Rule
The enforcer rule offers a rule for checking project's version
against a previously released artifact.
Checking a project's
compatibility
In order to check your project's compatibility, you must add the
enforcer rule as a dependency to the maven-enforcer-plugin and then
configure the maven-enforcer-plugin to run the rule:
<project>
  ...
  <build>
    ...
    <plugins>
      ...
      <plugin>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.0.1</version>
        ...
        <dependencies>
            ...
            <dependency>
                <groupId>org.semver</groupId>
                <artifactId>enforcer-rule</artifactId>
                <version>0.9.10</version>
            </dependency>
            ...
        </dependencies>
        ...
        <executions>
           ....
          <execution>
            <id>check</id>
            <phase>verify</phase>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requireBackwardCompatibility implementation="org.semver.enforcer.RequireBackwardCompatibility">
                  <compatibilityType>BACKWARD_COMPATIBLE_IMPLEMENTER</compatibilityType>
                </requireBackwardCompatibility>
              </rules>
            </configuration>
          </execution>
          ...
        </executions>
        ...
      </plugin>
      ...
    </plugins>
    ...
  </build>
  ...
</project>
Once you have configured your project, maven-enforcer will be able to
throw a build error if current version is not backward compatible with
last released one.
Checking a project's version
In order to check your project's version, you must add the enforcer
rule as a dependency to the maven-enforcer-plugin and then configure the
maven-enforcer-plugin to run the rule:
<project>
  ...
  <build>
    ...
    <plugins>
      ...
      <plugin>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.0.1</version>
        ...
        <dependencies>
            ...
            <dependency>
                <groupId>org.semver</groupId>
                <artifactId>enforcer-rule</artifactId>
                <version>0.9.10</version>
            </dependency>
            ...
        </dependencies>
        ...
        <executions>
           ....
          <execution>
            <id>check</id>
            <phase>verify</phase>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requireSemanticVersioningConformance implementation="org.semver.enforcer.RequireSemanticVersioningConformance" />
              </rules>
            </configuration>
          </execution>
          ...
        </executions>
        ...
      </plugin>
      ...
    </plugins>
    ...
  </build>
  ...
</project>
Once you have configured your project, maven-enforcer will be able to
throw a build error if current version follows semantic versioning
principles.
API overview
Semantic Versioning also provides an API for programmatically
validating your project's version number.
final File previousJar = ...;
final File currentJar = ...;
        
final Comparer comparer = new Comparer(previousJar, currentJar, ..., ...);
final Delta delta = comparer.diff();

final String compatibilityType = ...;

//Validates that computed and provided compatibility type are compatible.
final Delta.CompatibilityType expectedCompatibilityType = Delta.CompatibilityType.valueOf(compatibilityType);
final Delta.CompatibilityType detectedCompatibilityType = delta.computeCompatibilityType();
if (detectedCompatibilityType.compareTo(expectedCompatibilityType) > 0) {
  //Not compatible.
}

//Provide version number for previous and current Jar files.
final Version previous = Version.parse(...);
final Version current = Version.parse(...);

//Validates that current version number is valid based on semantic versioning principles.
final boolean compatible = delta.validate(previous, current);
Maven dependency
<dependency>
    <groupId>org.semver</groupId>
    <artifactId>enforcer-rule</artifactId>
    <version>0.9.10</version>
</dependency>