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 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 * </p> 035 * <p> 036 * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker} 037 * </p> 038 * <p> 039 * Violation Message Keys: 040 * </p> 041 * <ul> 042 * <li> 043 * {@code super.constructor.call} 044 * </li> 045 * </ul> 046 * 047 * @since 8.29 048 */ 049@StatelessCheck 050public final class AvoidNoArgumentSuperConstructorCallCheck extends AbstractCheck { 051 052 /** 053 * A key is pointing to the warning message text in "messages.properties" 054 * file. 055 */ 056 public static final String MSG_CTOR = "super.constructor.call"; 057 058 @Override 059 public int[] getDefaultTokens() { 060 return getRequiredTokens(); 061 } 062 063 @Override 064 public int[] getAcceptableTokens() { 065 return getRequiredTokens(); 066 } 067 068 @Override 069 public int[] getRequiredTokens() { 070 return new int[] { 071 TokenTypes.SUPER_CTOR_CALL, 072 }; 073 } 074 075 @Override 076 public void visitToken(DetailAST ast) { 077 if (ast.getFirstChild().getType() == TokenTypes.LPAREN 078 && ast.findFirstToken(TokenTypes.ELIST).getChildCount() == 0) { 079 log(ast, MSG_CTOR); 080 } 081 } 082}