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 synchronized statements.
   *
   */
  public class SynchronizedHandler extends BlockParentHandler {
  
      /**
       * Determine that "synchronized" token used as modifier of method.
       */
      private final boolean methodModifier;
  
      /**
       * Construct an instance of this handler with the given indentation check,
       * name, abstract syntax tree, and parent handler.
       *
       * @param indentCheck the indentation check
       * @param ast         the abstract syntax tree
       * @param parent      the parent handler
       */
      public SynchronizedHandler(IndentationCheck indentCheck, DetailAST ast,
                                 AbstractExpressionHandler parent) {
          super(indentCheck, "synchronized", ast, parent);
          methodModifier = isMethodModifier(ast);
      }
  
      @Override
      public void checkIndentation() {
          if (!methodModifier) {
              super.checkIndentation();
              checkSynchronizedExpr();
              checkWrappingIndentation(getMainAst(),
                      getSynchronizedStatementRightParen(getMainAst()));
          }
      }
  
      /**
       * Check indentation of expression we synchronized on.
       */
      private void checkSynchronizedExpr() {
          final DetailAST syncAst = getMainAst().findFirstToken(TokenTypes.LPAREN)
                  .getNextSibling();
          final IndentLevel expected =
                  new IndentLevel(getIndent(), getBasicOffset());
          checkExpressionSubtree(syncAst, expected, false, false);
      }
  
      /**
       * Checks if given synchronized is modifier of method.
       *
       * @param ast synchronized(TokenTypes.LITERAL_SYNCHRONIZED) to check
       * @return true if synchronized only modifies method
       */
      private static boolean isMethodModifier(DetailAST ast) {
          return ast.getParent().getType() == TokenTypes.MODIFIERS;
      }
  
      /**
       * Returns right parenthesis of synchronized statement.
       *
       * @param syncStatementAST ast node(TokenTypes.LITERAL_SYNCHRONIZED)
       * @return right parenthesis of synchronized statement.
       */
      private static DetailAST getSynchronizedStatementRightParen(DetailAST syncStatementAST) {
          return syncStatementAST.findFirstToken(TokenTypes.RPAREN);
      }
  
  }
  