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;
  import com.puppycrawl.tools.checkstyle.utils.TokenUtil;
  
  /**
   * Handler for method calls.
   *
   */
  public class MethodCallHandler extends AbstractExpressionHandler {
  
      /**
       * The instance of {@code IndentationCheck} used by this class.
       */
      private final IndentationCheck indentCheck;
  
      /**
       * Construct an instance of this handler with the given indentation check,
       * abstract syntax tree, and parent handler.
       *
       * @param indentCheck   the indentation check
       * @param ast           the abstract syntax tree
       * @param parent        the parent handler
       */
      public MethodCallHandler(IndentationCheck indentCheck,
          DetailAST ast, AbstractExpressionHandler parent) {
          super(indentCheck, "method call", ast, parent);
          this.indentCheck = indentCheck;
      }
  
      @Override
      protected IndentLevel getIndentImpl() {
          final IndentLevel indentLevel;
          // if inside a method call's params, this could be part of
          // an expression, so get the previous line's start
          if (getParent() instanceof MethodCallHandler) {
              final MethodCallHandler container =
                      (MethodCallHandler) getParent();
              if (TokenUtil.areOnSameLine(container.getMainAst(), getMainAst())
                      || isChainedMethodCallWrapped()
                      || areMethodsChained(container.getMainAst(), getMainAst())) {
                  indentLevel = container.getIndent();
              }
              // we should increase indentation only if this is the first
              // chained method call which was moved to the next line
              else {
                  indentLevel = new IndentLevel(container.getIndent(),
                      getIndentCheck().getLineWrappingIndentation());
              }
          }
          else if (getMainAst().getFirstChild().getType() == TokenTypes.LITERAL_NEW) {
              indentLevel = super.getIndentImpl();
          }
          else {
              // if our expression isn't first on the line, just use the start
              // of the line
              final DetailAstSet astSet = new DetailAstSet(indentCheck);
              findSubtreeAst(astSet, getMainAst().getFirstChild(), true);
              final int firstCol = expandedTabsColumnNo(astSet.firstLine());
              final int lineStart = getLineStart(getFirstAst(getMainAst()));
              if (lineStart == firstCol) {
                  indentLevel = super.getIndentImpl();
              }
              else {
                  indentLevel = new IndentLevel(lineStart);
              }
          }
          return indentLevel;
      }
  
      /**
       * Checks if ast2 is a chained method call that starts on the same level as ast1 ends.
       * In other words, if the right paren of ast1 is on the same level as the lparen of ast2:
       * {@code
       *     value.methodOne(
       *         argument1
       *     ).methodTwo(
       *         argument2
       *     );
       * }
       *
       * @param ast1 Ast1
       * @param ast2 Ast2
       * @return True if ast2 begins on the same level that ast1 ends
       */
      private static boolean areMethodsChained(DetailAST ast1, DetailAST ast2) {
          final DetailAST rparen = ast1.findFirstToken(TokenTypes.RPAREN);
          return TokenUtil.areOnSameLine(rparen, ast2);
      }
  
      /**
       * If this is the first chained method call which was moved to the next line.
       *
       * @return true if chained class are wrapped
       */
      private boolean isChainedMethodCallWrapped() {
          boolean result = false;
          final DetailAST main = getMainAst();
          final DetailAST dot = main.getFirstChild();
          final DetailAST target = dot.getFirstChild();
  
          final DetailAST dot1 = target.getFirstChild();
          final DetailAST target1 = dot1.getFirstChild();
  
          if (dot1.getType() == TokenTypes.DOT
              && target1.getType() == TokenTypes.METHOD_CALL) {
              result = true;
          }
          return result;
      }
  
      /**
       * Get the first AST of the specified method call.
       *
       * @param ast
       *            the method call
       *
       * @return the first AST of the specified method call
       */
      private static DetailAST getFirstAst(DetailAST ast) {
          // walk down the first child part of the dots that make up a method
          // call name
  
          DetailAST astNode = ast.getFirstChild();
          while (astNode.getType() == TokenTypes.DOT) {
              astNode = astNode.getFirstChild();
          }
          return astNode;
      }
  
      /**
       * Returns method or constructor name. For {@code foo(arg)} it is `foo`, for
       *     {@code foo.bar(arg)} it is `bar` for {@code super(arg)} it is 'super'.
       *
       * @return TokenTypes.IDENT node for a method call, TokenTypes.SUPER_CTOR_CALL otherwise.
       */
      private DetailAST getMethodIdentAst() {
          DetailAST ast = getMainAst();
          if (ast.getType() != TokenTypes.SUPER_CTOR_CALL) {
              ast = ast.getFirstChild();
              if (ast.getType() == TokenTypes.DOT) {
                  ast = ast.getLastChild();
              }
          }
          return ast;
      }
  
      @Override
      public IndentLevel getSuggestedChildIndent(AbstractExpressionHandler child) {
          // for whatever reason a method that crosses lines, like asList
          // here:
          //            System.out.println("methods are: " + Arrays.asList(
          //                new String[] {"method"}).toString());
          // will not have the right line num, so just get the child name
  
          final DetailAST ident = getMethodIdentAst();
          final DetailAST rparen = getMainAst().findFirstToken(TokenTypes.RPAREN);
          IndentLevel suggestedLevel = new IndentLevel(getLineStart(ident));
          if (!TokenUtil.areOnSameLine(child.getMainAst().getFirstChild(), ident)) {
              suggestedLevel = new IndentLevel(suggestedLevel,
                      getBasicOffset(),
                      getIndentCheck().getLineWrappingIndentation());
          }
  
          // If the right parenthesis is at the start of a line;
          // include line wrapping in suggested indent level.
          if (getLineStart(rparen) == rparen.getColumnNo()) {
              suggestedLevel = IndentLevel.addAcceptable(suggestedLevel, new IndentLevel(
                      getParent().getSuggestedChildIndent(this),
                      getIndentCheck().getLineWrappingIndentation()
              ));
          }
  
          return suggestedLevel;
      }
  
      @Override
      public void checkIndentation() {
          DetailAST lparen = null;
          if (getMainAst().getType() == TokenTypes.METHOD_CALL) {
              final DetailAST exprNode = getMainAst().getParent();
              if (exprNode.getParent().getType() == TokenTypes.SLIST) {
                  checkExpressionSubtree(getMainAst().getFirstChild(), getIndent(), false, false);
                  lparen = getMainAst();
              }
          }
          else {
              // TokenTypes.CTOR_CALL|TokenTypes.SUPER_CTOR_CALL
              lparen = getMainAst().getFirstChild();
          }
  
          if (lparen != null) {
              final DetailAST rparen = getMainAst().findFirstToken(TokenTypes.RPAREN);
              checkLeftParen(lparen);
  
              if (!TokenUtil.areOnSameLine(rparen, lparen)) {
                  checkExpressionSubtree(
                      getMainAst().findFirstToken(TokenTypes.ELIST),
                      new IndentLevel(getIndent(), getBasicOffset()),
                      false, true);
  
                  checkRightParen(lparen, rparen);
                  checkWrappingIndentation(getMainAst(), getCallLastNode(getMainAst()));
              }
          }
      }
  
      @Override
      protected boolean shouldIncreaseIndent() {
          return false;
      }
  
      /**
       * Returns method or constructor call right paren.
       *
       * @param firstNode
       *          call ast(TokenTypes.METHOD_CALL|TokenTypes.CTOR_CALL|TokenTypes.SUPER_CTOR_CALL)
       * @return ast node containing right paren for specified method or constructor call. If
       *     method calls are chained returns right paren for last call.
       */
      private static DetailAST getCallLastNode(DetailAST firstNode) {
          return firstNode.getLastChild();
      }
  
  }
  