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.coding; 021 022import com.puppycrawl.tools.checkstyle.StatelessCheck; 023import com.puppycrawl.tools.checkstyle.api.AbstractCheck; 024import com.puppycrawl.tools.checkstyle.api.DetailAST; 025import com.puppycrawl.tools.checkstyle.api.TokenTypes; 026 027/** 028 * <p> 029 * Checks that classes (except abstract ones) define a constructor and don't rely 030 * on the default one. 031 * </p> 032 * <p> 033 * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker} 034 * </p> 035 * <p> 036 * Violation Message Keys: 037 * </p> 038 * <ul> 039 * <li> 040 * {@code missing.ctor} 041 * </li> 042 * </ul> 043 * 044 * @since 3.4 045 */ 046@StatelessCheck 047public class MissingCtorCheck extends AbstractCheck { 048 049 /** 050 * A key is pointing to the warning message text in "messages.properties" 051 * file. 052 */ 053 public static final String MSG_KEY = "missing.ctor"; 054 055 @Override 056 public int[] getDefaultTokens() { 057 return getRequiredTokens(); 058 } 059 060 @Override 061 public int[] getAcceptableTokens() { 062 return getRequiredTokens(); 063 } 064 065 @Override 066 public int[] getRequiredTokens() { 067 return new int[] {TokenTypes.CLASS_DEF}; 068 } 069 070 @Override 071 public void visitToken(DetailAST ast) { 072 final DetailAST modifiers = ast.findFirstToken(TokenTypes.MODIFIERS); 073 if (modifiers.findFirstToken(TokenTypes.ABSTRACT) == null 074 && ast.findFirstToken(TokenTypes.OBJBLOCK) 075 .findFirstToken(TokenTypes.CTOR_DEF) == null) { 076 log(ast, MSG_KEY); 077 } 078 } 079 080}