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  ------
  Usage
  ------
  Brian Fox
  ------
  Mar 2007
  ------

Usage
 
  Brief examples on how to use the enforcer goals.
 
* Generic Plugin configuration information

  See the following links for information about including and configuring plugins in your project:
  
  *{{{http://maven.apache.org/guides/mini/guide-configuring-plugins.html}Configuring Plugins}}
  
  *{{{http://maven.apache.org/guides/plugin/guide-java-plugin-development.html}Plugin Development}}

  *{{{http://maven.apache.org/guides/introduction/introduction-to-plugin-prefix-mapping.html}Plugin Prefix}}
  
  []

* The <<<enforcer:enforce>>> mojo

   This goal is meant to be bound to a lifecycle phase and configured in your
   <<<pom.xml>>>. The enforcers execute the configured rules to check for certain constraints. 
   The available built-in rules are described {{{../enforcer-rules/index.html}here}}. Besides the rules to execute, these goals support three options:
   
   * {{{./enforce-mojo.html#skip}skip}} - a quick way to skip checks via a profile or using <<<-Denforcer.skip=true>>> from the command line.
   
   * {{{./enforce-mojo.html#fail}fail}} - if the goal should fail the build when a rule fails. The default is <<<true>>>. If false, the errors will be logged as warnings.
   
   * {{{./enforce-mojo.html#failFast}failFast}} - if the goal should stop checking after the first failure. The default is <<<false>>>.
   
   []
   
   Each rule to be executed should be added to the rules element along with the specific configuration for that rule.

   As of version 1.4, you may add a <<<level>>> element to the rules. Valid values are <<<WARN>>> and <<<ERROR>>>. When
   <<<level>>> <<<WARN>>> is specified, the rule will only spit out a warning but will not fail the build.
   

   Sample Plugin Configuration:
   
+---+
<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>${project.version}</version>
        <executions>
          <execution>
            <id>enforce-versions</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <bannedPlugins>
                  <!-- will only display a warning but does not fail the build. -->
                  <level>WARN</level>
                  <excludes>
                    <exclude>org.apache.maven.plugins:maven-verifier-plugin</exclude>
                  </excludes>
                  <message>Please consider using the maven-invoker-plugin (http://maven.apache.org/plugins/maven-invoker-plugin/)!</message>
                </bannedPlugins>
                <requireMavenVersion>
                  <version>2.0.6</version>
                </requireMavenVersion>
                <requireJavaVersion>
                  <version>1.5</version>
                </requireJavaVersion>
                <requireOS>
                  <family>unix</family>
                </requireOS>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>
+---+
  
* The <<<enforcer:display-info>>> mojo

   This goal is used to determine the current information as detected by the standard rules:
     
+---+
   mvn enforcer:display-info
   ...
   [enforcer:display-info]
       Maven Version: 2.0.6
       JDK Version: 1.5.0_11 normalized as: 1.5.0-11
       OS Info: Arch: x86 Family: windows Name: windows xp Version: 5.1
+---+