code: public static Path contains(final String cacheName) throws IOException {
  
  		final LibraryCacheManager lib = get();
  		return lib.containsInternal(cacheName);
  	}
docs: Checks if the given library is in the local cache.
  
  @param cacheName
  The name of the library to be checked for.
  @return the path object of the library if it is cached, <code>null</code> otherwise
  @throws IOException
  thrown if the library cache manager could not be instantiated or no access to the file system could be
  obtained