public static void addFiles(final Project findBugsProject,File clzDir,final Pattern pat){
  if (clzDir.isDirectory()) {
    clzDir.listFiles(new FileCollector(pat,findBugsProject));
  }
}

public static void addFiles ( final Project findBugsProject , File clzDir , final Pattern pat ) { if ( clzDir . isDirectory ( ) ) { clzDir . listFiles ( new FileCollector ( pat , findBugsProject ) ) ; } }
recurse add all the files matching given name pattern inside the given directory and all subdirectories
