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}