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.indentation; 021 022import com.puppycrawl.tools.checkstyle.api.DetailAST; 023import com.puppycrawl.tools.checkstyle.api.TokenTypes; 024 025/** 026 * Handler for labels. 027 * 028 */ 029public class LabelHandler extends AbstractExpressionHandler { 030 031 /** 032 * The types of expressions that are children of a label. 033 */ 034 private static final int[] LABEL_CHILDREN = { 035 TokenTypes.IDENT, 036 }; 037 038 /** 039 * Construct an instance of this handler with the given indentation check, 040 * abstract syntax tree, and parent handler. 041 * 042 * @param indentCheck the indentation check 043 * @param expr the abstract syntax tree 044 * @param parent the parent handler 045 */ 046 public LabelHandler(IndentationCheck indentCheck, 047 DetailAST expr, AbstractExpressionHandler parent) { 048 super(indentCheck, "label", expr, parent); 049 } 050 051 @Override 052 protected IndentLevel getIndentImpl() { 053 final IndentLevel level = new IndentLevel(super.getIndentImpl(), -getBasicOffset()); 054 return IndentLevel.addAcceptable(level, super.getIndentImpl()); 055 } 056 057 /** 058 * Check the indentation of the label. 059 */ 060 private void checkLabel() { 061 checkChildren(getMainAst(), LABEL_CHILDREN, getIndent(), true, false); 062 } 063 064 @Override 065 public void checkIndentation() { 066 checkLabel(); 067 // need to check children (like 'block' parents do) 068 final DetailAST parent = getMainAst().getFirstChild().getNextSibling(); 069 070 final IndentLevel expected = 071 new IndentLevel(getIndent(), getBasicOffset()); 072 073 checkExpressionSubtree(parent, expected, true, false); 074 } 075 076}