001//////////////////////////////////////////////////////////////////////////////// 002// checkstyle: Checks Java source code for adherence to a set of rules. 003// Copyright (C) 2001-2014 Oliver Burn 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.coding; 021 022import com.puppycrawl.tools.checkstyle.api.Check; 023import com.puppycrawl.tools.checkstyle.api.TokenTypes; 024import com.puppycrawl.tools.checkstyle.api.DetailAST; 025 026/** 027 * <p> 028 * Detects empty statements (standalone ';'). 029 * Empty statements often introduce bugs 030 * that are hard to spot, such as in 031 * </p> 032 * <pre> 033 * if (someCondition); 034 * doConditionalStuff(); 035 * doUnconditionalStuff(); 036 * </pre> 037 * <p> 038 * An example of how to configure the check is: 039 * </p> 040 * <pre> 041 * <module name="EmptyStatement"/> 042 * </pre> 043 * @author Rick Giles 044 * @version 1.0 045 */ 046public class EmptyStatementCheck extends Check 047{ 048 @Override 049 public int[] getDefaultTokens() 050 { 051 return new int[] {TokenTypes.EMPTY_STAT}; 052 } 053 054 @Override 055 public void visitToken(DetailAST ast) 056 { 057 log(ast.getLineNo(), ast.getColumnNo(), "empty.statement"); 058 } 059}