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 * <div> 029 * Checks if call to superclass constructor without arguments is present. 030 * Such invocation is redundant because constructor body implicitly 031 * begins with a superclass constructor invocation {@code super();} 032 * See <a href="https://docs.oracle.com/javase/specs/jls/se13/html/jls-8.html#jls-8.8.7"> 033 * specification</a> for detailed information. 034 * </div> 035 * 036 * <p> 037 * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker} 038 * </p> 039 * 040 * <p> 041 * Violation Message Keys: 042 * </p> 043 * <ul> 044 * <li> 045 * {@code super.constructor.call} 046 * </li> 047 * </ul> 048 * 049 * @since 8.29 050 */ 051@StatelessCheck 052public final class AvoidNoArgumentSuperConstructorCallCheck extends AbstractCheck { 053 054 /** 055 * A key is pointing to the warning message text in "messages.properties" 056 * file. 057 */ 058 public static final String MSG_CTOR = "super.constructor.call"; 059 060 @Override 061 public int[] getDefaultTokens() { 062 return getRequiredTokens(); 063 } 064 065 @Override 066 public int[] getAcceptableTokens() { 067 return getRequiredTokens(); 068 } 069 070 @Override 071 public int[] getRequiredTokens() { 072 return new int[] { 073 TokenTypes.SUPER_CTOR_CALL, 074 }; 075 } 076 077 @Override 078 public void visitToken(DetailAST ast) { 079 if (ast.getFirstChild().getType() == TokenTypes.LPAREN 080 && ast.findFirstToken(TokenTypes.ELIST).getChildCount() == 0) { 081 log(ast, MSG_CTOR); 082 } 083 } 084}