001///////////////////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code and other text files for adherence to a set of rules.
003// Copyright (C) 2001-2025 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 switch statements.
028 *
029 */
030public class SwitchHandler 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 SwitchHandler(IndentationCheck indentCheck,
041        DetailAST ast, AbstractExpressionHandler parent) {
042        super(indentCheck, "switch", ast, parent);
043    }
044
045    @Override
046    protected DetailAST getLeftCurly() {
047        return getMainAst().findFirstToken(TokenTypes.LCURLY);
048    }
049
050    @Override
051    protected DetailAST getRightCurly() {
052        return getMainAst().findFirstToken(TokenTypes.RCURLY);
053    }
054
055    @Override
056    protected DetailAST getListChild() {
057        // all children should be taken care of by case handler (plus
058        // there is no parent of just the cases, if checking is needed
059        // here in the future, an additional way beyond checkChildren()
060        // will have to be devised to get children)
061        return null;
062    }
063
064    @Override
065    protected DetailAST getNonListChild() {
066        return null;
067    }
068
069    /**
070     * Check the indentation of the switch expression.
071     */
072    private void checkSwitchExpr() {
073        checkExpressionSubtree(
074            getMainAst().findFirstToken(TokenTypes.LPAREN).getNextSibling(),
075            getIndent(),
076            false,
077            false);
078    }
079
080    @Override
081    protected IndentLevel getIndentImpl() {
082        IndentLevel indentLevel = super.getIndentImpl();
083        // if switch is starting the line
084        if (isOnStartOfLine(getMainAst())
085                && TokenUtil.isOfType(getMainAst().getParent().getParent(), TokenTypes.ASSIGN)) {
086            indentLevel = new IndentLevel(indentLevel,
087                    getIndentCheck().getLineWrappingIndentation());
088        }
089        return indentLevel;
090    }
091
092    @Override
093    public void checkIndentation() {
094        checkSwitchExpr();
095        super.checkIndentation();
096    }
097
098}