001/////////////////////////////////////////////////////////////////////////////////////////////// 002// checkstyle: Checks Java source code and other text files for adherence to a set of rules. 003// Copyright (C) 2001-2024 the original author or authors. 004// 005// This library is free software; you can redistribute it and/or 006// modify it under the terms of the GNU Lesser General Public 007// License as published by the Free Software Foundation; either 008// version 2.1 of the License, or (at your option) any later version. 009// 010// This library is distributed in the hope that it will be useful, 011// but WITHOUT ANY WARRANTY; without even the implied warranty of 012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013// Lesser General Public License for more details. 014// 015// You should have received a copy of the GNU Lesser General Public 016// License along with this library; if not, write to the Free Software 017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 018/////////////////////////////////////////////////////////////////////////////////////////////// 019 020package com.puppycrawl.tools.checkstyle.checks.indentation; 021 022import com.puppycrawl.tools.checkstyle.api.DetailAST; 023import com.puppycrawl.tools.checkstyle.api.TokenTypes; 024 025/** 026 * Handler for synchronized statements. 027 * 028 */ 029public class SynchronizedHandler extends BlockParentHandler { 030 031 /** 032 * Determine that "synchronized" token used as modifier of method. 033 */ 034 private final boolean methodModifier; 035 036 /** 037 * Construct an instance of this handler with the given indentation check, 038 * name, abstract syntax tree, and parent handler. 039 * 040 * @param indentCheck the indentation check 041 * @param ast the abstract syntax tree 042 * @param parent the parent handler 043 */ 044 public SynchronizedHandler(IndentationCheck indentCheck, DetailAST ast, 045 AbstractExpressionHandler parent) { 046 super(indentCheck, "synchronized", ast, parent); 047 methodModifier = isMethodModifier(ast); 048 } 049 050 @Override 051 public void checkIndentation() { 052 if (!methodModifier) { 053 super.checkIndentation(); 054 checkSynchronizedExpr(); 055 checkWrappingIndentation(getMainAst(), 056 getSynchronizedStatementRightParen(getMainAst())); 057 } 058 } 059 060 /** 061 * Check indentation of expression we synchronized on. 062 */ 063 private void checkSynchronizedExpr() { 064 final DetailAST syncAst = getMainAst().findFirstToken(TokenTypes.LPAREN) 065 .getNextSibling(); 066 final IndentLevel expected = 067 new IndentLevel(getIndent(), getBasicOffset()); 068 checkExpressionSubtree(syncAst, expected, false, false); 069 } 070 071 /** 072 * Checks if given synchronized is modifier of method. 073 * 074 * @param ast synchronized(TokenTypes.LITERAL_SYNCHRONIZED) to check 075 * @return true if synchronized only modifies method 076 */ 077 private static boolean isMethodModifier(DetailAST ast) { 078 return ast.getParent().getType() == TokenTypes.MODIFIERS; 079 } 080 081 /** 082 * Returns right parenthesis of synchronized statement. 083 * 084 * @param syncStatementAST ast node(TokenTypes.LITERAL_SYNCHRONIZED) 085 * @return right parenthesis of synchronized statement. 086 */ 087 private static DetailAST getSynchronizedStatementRightParen(DetailAST syncStatementAST) { 088 return syncStatementAST.findFirstToken(TokenTypes.RPAREN); 089 } 090 091}