1 ///////////////////////////////////////////////////////////////////////////////////////////////
2 // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
3 // Copyright (C) 2001-2024 the original author or authors.
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ///////////////////////////////////////////////////////////////////////////////////////////////
19
20 package com.puppycrawl.tools.checkstyle.checks.coding;
21
22 import com.puppycrawl.tools.checkstyle.StatelessCheck;
23 import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
24 import com.puppycrawl.tools.checkstyle.api.DetailAST;
25 import com.puppycrawl.tools.checkstyle.api.TokenTypes;
26
27 /**
28 * <p>
29 * Checks if call to superclass constructor without arguments is present.
30 * Such invocation is redundant because constructor body implicitly
31 * begins with a superclass constructor invocation {@code super();}
32 * See <a href="https://docs.oracle.com/javase/specs/jls/se13/html/jls-8.html#jls-8.8.7">
33 * specification</a> for detailed information.
34 * </p>
35 * <p>
36 * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
37 * </p>
38 * <p>
39 * Violation Message Keys:
40 * </p>
41 * <ul>
42 * <li>
43 * {@code super.constructor.call}
44 * </li>
45 * </ul>
46 *
47 * @since 8.29
48 */
49 @StatelessCheck
50 public final class AvoidNoArgumentSuperConstructorCallCheck extends AbstractCheck {
51
52 /**
53 * A key is pointing to the warning message text in "messages.properties"
54 * file.
55 */
56 public static final String MSG_CTOR = "super.constructor.call";
57
58 @Override
59 public int[] getDefaultTokens() {
60 return getRequiredTokens();
61 }
62
63 @Override
64 public int[] getAcceptableTokens() {
65 return getRequiredTokens();
66 }
67
68 @Override
69 public int[] getRequiredTokens() {
70 return new int[] {
71 TokenTypes.SUPER_CTOR_CALL,
72 };
73 }
74
75 @Override
76 public void visitToken(DetailAST ast) {
77 if (ast.getFirstChild().getType() == TokenTypes.LPAREN
78 && ast.findFirstToken(TokenTypes.ELIST).getChildCount() == 0) {
79 log(ast, MSG_CTOR);
80 }
81 }
82 }