<project>
...
  <repositories>
    <repository>
      <id>nexus</id>
      <name>Nexus</name>
      <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
      <releases><enabled>true</enabled></releases>
      <snapshots><enabled>true</enabled></snapshots>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>nexus</id>
      <name>Nexus</name>
      <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
      <releases><enabled>true</enabled></releases>
      <snapshots><enabled>true</enabled></snapshots>
    </pluginRepository>
  </pluginRepositories>
...
</project>

<settings>
  ...
  <profiles>
    <profile>
      <id>nexus</id>
      <repositories>
        <repository>
          <id>nexus</id>
          <name>Nexus</name>
          <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>nexus</id>
          <name>Nexus</name>
          <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>nexus</activeProfile>
  </activeProfiles>
  ...
</settings>

<settings>
  ...
  <mirrors>
    <mirror>
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
    </mirror>
  </mirrors>
  <profiles>
    <profile>
      <id>nexus</id>
      <repositories>
        <repository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>nexus</activeProfile>
  </activeProfiles>
  ...
</settings>

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.maven.model.Resource;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
/**
 * 
 * @author org.omylab.yakov
 * @goal yakov
*/
public class YakovMojo extends AbstractMojo{
  private final String[] INCLUDES_DEFAULT={"java","xml","properties"};

  /**
   * @parameter expression="${project.basedir}"
   * @required
   * @readonly
*/
  private File basedir;
  /**
   * @parameter expression ="${project.build.sourceDirectory}"
   * @required
   * @readonly
*/
  private File sourceDirectory;
  /**
   * @parameter expression ="${project.biuld.testSourceDirectory}"
   * @required
   * @readonly
*/
  private File testSourceDirectory;
  /**
   * @parameter expression ="${project.build.resources}"
   * @required
   * @readonly
*/
  private List<Resource> resources;
  /**
   * @parameter expression "${project.build.testResources}"
   * @required
   * @readonly
*/
  private List<Resource> testResources;
  /**
   * The file types which will be included for counting
   *
   * @parameter
*/
  private String[] includes;
  public void execute() throws MojoExecutionException, MojoFailureException{
    if(includes==null||includes.length==0){
      includes=INCLUDES_DEFAULT;
    }
    try{
      countDir(sourceDirectory);
      countDir(testSourceDirectory);
      for(Resource resource:resources){
        countDir(new File(resource.getDirectory()));
      }
      for(Resource resource:testResources){
        countDir(new File(resource.getDirectory()));
      }
    }catch(IOException e){
      throw new MojoExecutionException("Unable to count lines of code.",e);
    }
  }
  
  private void countDir(File dir)throws IOException{
    if(!dir.exists())return;
    List<File> collected=new ArrayList<File>();
    collectFiles(collected,dir);
    int lines=0;
    for(File sourceFile:collected){
      lines+=countLine(sourceFile);
    }
    String path=dir.getAbsolutePath().substring(basedir.getAbsolutePath().length());
    getLog().info(path+" : "+lines+" lines of code in "+collected.size()+" files");
  }
  
  private void collectFiles(List<File> collected,File file){
    if(file.isFile()){
      for(String include:includes){
        if(file.getName().endsWith("."+include)){
          collected.add(file);
          break;
        }
      }
    }else{
      for(File sub:file.listFiles()){
        collectFiles(collected,sub);
      }
    }
  }
  private int countLine(File file)throws IOException{
    BufferedReader reader=new BufferedReader(new FileReader(file));
    int line =0;
    try{
      while(reader.ready()){
        reader.readLine();
        line++;
      }
    }finally{
      reader.close();
    }
    return line;
  }

}