code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.api;
  
  import java.io.File;
  import java.util.List;
  
  /**
   * The first module that is run as part of Checkstyle and controls its entire
   * behavior and children.
   */
  public interface RootModule extends Configurable {
  
      /** Cleans up the object. **/
      void destroy();
  
      /**
       * Processes a set of files.
       * Once this is done, it is highly recommended to call for
       * the destroy method to close and remove the listeners.
       *
       * @param files the list of files to be audited.
       * @return the total number of audit events with error severity found
       * @throws CheckstyleException if error condition within Checkstyle occurs
       * @see #destroy()
       */
      int process(List<File> files) throws CheckstyleException;
  
      /**
       * Add the listener that will be used to receive events from the audit.
       *
       * @param listener the nosy thing
       */
      void addListener(AuditListener listener);
  
      /**
       * Sets the classloader used to load Checkstyle core and custom module
       * classes when the module tree is being built up.
       * If no custom ModuleFactory is being set for the root module then
       * this module classloader must be specified.
       *
       * @param moduleClassLoader the classloader used to load module classes
       */
      void setModuleClassLoader(ClassLoader moduleClassLoader);
  
  }
  