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.checks.indentation;
  
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  
  /**
   * Handler for case statements.
   *
   */
  public class CaseHandler extends AbstractExpressionHandler {
  
      /**
       * The child elements of a case expression.
       */
      private static final int[] CASE_CHILDREN = {
          TokenTypes.LITERAL_CASE,
          TokenTypes.LITERAL_DEFAULT,
      };
  
      /**
       * Construct an instance of this handler with the given indentation check,
       * abstract syntax tree, and parent handler.
       *
       * @param indentCheck   the indentation check
       * @param expr          the abstract syntax tree
       * @param parent        the parent handler
       */
      public CaseHandler(IndentationCheck indentCheck,
          DetailAST expr, AbstractExpressionHandler parent) {
          super(indentCheck, "case", expr, parent);
      }
  
      @Override
      protected IndentLevel getIndentImpl() {
          return new IndentLevel(getParent().getIndent(),
                                 getIndentCheck().getCaseIndent());
      }
  
      /**
       * Check the indentation of the case statement.
       */
      private void checkCase() {
          checkChildren(getMainAst(), CASE_CHILDREN, getIndent(), true, false);
      }
  
      @Override
      public IndentLevel getSuggestedChildIndent(AbstractExpressionHandler child) {
          return getIndent();
      }
  
      @Override
      public void checkIndentation() {
          checkCase();
      }
  
  }
  