001//////////////////////////////////////////////////////////////////////////////// 002// checkstyle: Checks Java source code for adherence to a set of rules. 003// Copyright (C) 2001-2014 Oliver Burn 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//////////////////////////////////////////////////////////////////////////////// 019package com.puppycrawl.tools.checkstyle.checks.indentation; 020 021import com.puppycrawl.tools.checkstyle.api.DetailAST; 022import com.puppycrawl.tools.checkstyle.api.TokenTypes; 023 024/** 025 * Handler for labels. 026 * 027 * @author jrichard 028 */ 029public class LabelHandler extends ExpressionHandler 030{ 031 /** 032 * The types of expressions that are children of a label. 033 */ 034 private static final int[] LABEL_CHILDREN = new int[] { 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, ExpressionHandler parent) 048 { 049 super(indentCheck, "label", expr, parent); 050 } 051 052 @Override 053 protected IndentLevel getLevelImpl() 054 { 055 final IndentLevel level = new IndentLevel(super.getLevelImpl(), -getBasicOffset()); 056 level.addAcceptedIndent(super.getLevelImpl()); 057 return level; 058 } 059 060 /** 061 * Check the indentation of the label. 062 */ 063 private void checkLabel() 064 { 065 checkChildren(getMainAst(), LABEL_CHILDREN, getLevel(), true, false); 066 } 067 068 @Override 069 public void checkIndentation() 070 { 071 checkLabel(); 072 // need to check children (like 'block' parents do) 073 final DetailAST parent = getMainAst().getFirstChild().getNextSibling(); 074 075 final IndentLevel expected = 076 new IndentLevel(getLevel(), getBasicOffset()); 077 078 checkExpressionSubtree(parent, expected, true, false); 079 } 080}