001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2015 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 method definitions.
027 *
028 * @author jrichard
029 * @author Maikel Steneker
030 */
031public class MethodDefHandler extends BlockParentHandler {
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 MethodDefHandler(IndentationCheck indentCheck,
041        DetailAST ast, AbstractExpressionHandler parent) {
042        super(indentCheck, getHandlerName(ast), ast, parent);
043    }
044
045    @Override
046    protected DetailAST getTopLevelAst() {
047        // we check this stuff ourselves below
048        return null;
049    }
050
051    @Override
052    protected void checkModifiers() {
053        final DetailAST modifier = getMainAst().findFirstToken(TokenTypes.MODIFIERS);
054        if (startsLine(modifier)
055            && !getLevel().isAcceptable(expandedTabsColumnNo(modifier))) {
056            logError(modifier, "modifier", expandedTabsColumnNo(modifier));
057        }
058    }
059
060    @Override
061    public void checkIndentation() {
062        checkModifiers();
063
064        final LineWrappingHandler lineWrap =
065            new LineWrappingHandler(getIndentCheck(), getMainAst(),
066                getMethodDefParamRightParen(getMainAst()));
067        lineWrap.checkIndentation();
068        if (getLCurly() == null) {
069            // abstract method def -- no body
070            return;
071        }
072        super.checkIndentation();
073    }
074
075    /**
076     * Returns right parenthesis of method definition parameter list.
077     * @param methodDefAst
078     *          method definition ast node(TokenTypes.LITERAL_IF)
079     * @return right parenthesis of method definition parameter list.
080     */
081    private static DetailAST getMethodDefParamRightParen(DetailAST methodDefAst) {
082        return methodDefAst.findFirstToken(TokenTypes.RPAREN);
083    }
084
085    /**
086     * Creates a handler name for this class according to ast type.
087     *
088     * @param ast the abstract syntax tree.
089     * @return handler name for this class.
090     */
091    private static String getHandlerName(DetailAST ast) {
092        final String name;
093
094        if (ast.getType() == TokenTypes.CTOR_DEF) {
095            name = "ctor def";
096        }
097        else {
098            name = "method def";
099        }
100        return name;
101    }
102}