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.Serializable;
  import java.util.Map;
  
  /**
   * A Configuration is used to configure a Configurable component.  The general
   * idea of Configuration/Configurable was taken from <a target="_top"
   * href="https://avalon.apache.org/closed.html">Jakarta's Avalon framework</a>.
   */
  public interface Configuration extends Serializable {
  
      /**
       * The set of attribute names.
       *
       * @return The set of attribute names, never null.
       * @deprecated This shall be removed in future releases. Please use
       *      {@code getPropertyNames()} instead.
       */
      @Deprecated(since = "8.45")
      String[] getAttributeNames();
  
      /**
       * The attribute value for an attribute name.
       *
       * @param name the attribute name
       * @return the value that is associated with name
       * @throws CheckstyleException if name is not a valid attribute name
       * @deprecated This shall be removed in future releases. Please use
       *      {@code getProperty(String name)} instead.
       */
      @Deprecated(since = "8.45")
      String getAttribute(String name) throws CheckstyleException;
  
      /**
       * The set of property names.
       *
       * @return The set of property names, never null.
       */
      String[] getPropertyNames();
  
      /**
       * The property value for property name.
       *
       * @param name the property name
       * @return the value that is associated with name
       * @throws CheckstyleException if name is not a valid property name
       */
      String getProperty(String name) throws CheckstyleException;
  
      /**
       * The set of child configurations.
       *
       * @return The set of child configurations, never null.
       */
      Configuration[] getChildren();
  
      /**
       * The name of this configuration.
       *
       * @return The name of this configuration.
       */
      String getName();
  
      /**
       * Returns an unmodifiable map instance containing the custom messages
       * for this configuration.
       *
       * @return unmodifiable map containing custom messages
       */
      Map<String, String> getMessages();
  
  }
  