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;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Inherited;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  /**
   * This annotation means that the check does not contain mutable state and
   * may be safely used from others threads at the same time.
   * The check does not contain mutable state, if it does not change any field values at the
   * execution stage (but it still can set properties at the initialization stage).
   * Checker guarantees that there will be exactly one check instance during the audit.
   * This also means, that all files will be processed by the same check instance.
   *
   * @noinspection ClassIndependentOfModule
   * @noinspectionreason ClassIndependentOfModule - we keep this annotation at top level by design
   */
  @Retention(RetentionPolicy.RUNTIME)
  @Target(ElementType.TYPE)
  @Inherited
  public @interface StatelessCheck {
  
      // this annotation does not have properties
  
  }
  