001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2021 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;
024import com.puppycrawl.tools.checkstyle.utils.TokenUtil;
025
026/**
027 * Handler for else blocks.
028 *
029 */
030public class ElseHandler extends BlockParentHandler {
031
032    /**
033     * Construct an instance of this handler with the given indentation check,
034     * abstract syntax tree, and parent handler.
035     *
036     * @param indentCheck   the indentation check
037     * @param ast           the abstract syntax tree
038     * @param parent        the parent handler
039     */
040    public ElseHandler(IndentationCheck indentCheck,
041        DetailAST ast, AbstractExpressionHandler parent) {
042        super(indentCheck, "else", ast, parent);
043    }
044
045    @Override
046    protected void checkTopLevelToken() {
047        // check if else is nested with rcurly of if:
048        //
049        //  } else ...
050
051        final DetailAST ifAST = getMainAst().getParent();
052        final DetailAST slist = ifAST.findFirstToken(TokenTypes.SLIST);
053        if (slist == null) {
054            super.checkTopLevelToken();
055        }
056        else {
057            final DetailAST lcurly = slist.getLastChild();
058            // indentation checked as part of LITERAL IF check
059            if (!TokenUtil.areOnSameLine(lcurly, getMainAst())) {
060                super.checkTopLevelToken();
061            }
062        }
063    }
064
065    @Override
066    protected DetailAST getNonListChild() {
067        return getMainAst().getFirstChild();
068    }
069
070}