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.internal.utils;
  
  import java.util.HashSet;
  import java.util.Properties;
  import java.util.Set;
  
  import com.puppycrawl.tools.checkstyle.ConfigurationLoader;
  import com.puppycrawl.tools.checkstyle.PropertiesExpander;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.api.Configuration;
  
  public final class ConfigurationUtil {
  
      private ConfigurationUtil() {
      }
  
      public static Configuration loadConfiguration(String path) throws CheckstyleException {
          final Properties props = new Properties();
  
          props.setProperty("checkstyle.basedir", "basedir");
          props.setProperty("checkstyle.cache.file", "file");
          props.setProperty("checkstyle.suppressions.file", "file");
          props.setProperty("checkstyle.suppressions-xpath.file", "file");
          props.setProperty("checkstyle.header.file", "file");
          props.setProperty("checkstyle.regexp.header.file", "file");
          props.setProperty("checkstyle.importcontrol.file", "file");
          props.setProperty("checkstyle.importcontroltest.file", "file");
  
          return loadConfiguration(path, props);
      }
  
      public static Configuration loadConfiguration(String path, Properties props)
              throws CheckstyleException {
          return ConfigurationLoader.loadConfiguration(path, new PropertiesExpander(props));
      }
  
      public static Set<Configuration> getModules(Configuration config) {
          final Set<Configuration> result = new HashSet<>();
  
          for (Configuration child : config.getChildren()) {
              if ("TreeWalker".equals(child.getName())) {
                  result.addAll(getModules(child));
              }
              else {
                  result.add(child);
              }
          }
  
          return result;
      }
  
      public static Set<Configuration> getChecks(Configuration config) {
          final Set<Configuration> result = new HashSet<>();
  
          for (Configuration child : config.getChildren()) {
              if ("TreeWalker".equals(child.getName())) {
                  result.addAll(getModules(child));
              }
          }
  
          return result;
      }
  
  }
  