001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2017 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.whitespace;
021
022import com.puppycrawl.tools.checkstyle.api.DetailAST;
023import com.puppycrawl.tools.checkstyle.api.TokenTypes;
024
025/**
026 * <p>Checks the padding of parentheses for typecasts. That is whether a space
027 * is required after a left parenthesis and before a right parenthesis, or such
028 * spaces are forbidden.
029 * </p>
030 * <p>
031 * The policy to verify is specified using the {@link PadOption} class and
032 * defaults to {@link PadOption#NOSPACE}.
033 * </p>
034 * <p>
035 * An example of how to configure the check is:
036 * </p>
037 * <pre>
038 * &lt;module name="TypecastParenPad"/&gt;
039 * </pre>
040 * <p>
041 * An example of how to configure the check to require spaces for the
042 * parentheses of constructor, method, and super constructor invocations is:
043 * </p>
044 * <pre>
045 * &lt;module name="TypecastParenPad"&gt;
046 *     &lt;property name="option" value="space"/&gt;
047 * &lt;/module&gt;
048 * </pre>
049 * @author Oliver Burn
050 */
051public class TypecastParenPadCheck extends AbstractParenPadCheck {
052    @Override
053    public int[] getRequiredTokens() {
054        return new int[] {TokenTypes.RPAREN, TokenTypes.TYPECAST};
055    }
056
057    @Override
058    public int[] getDefaultTokens() {
059        return getRequiredTokens();
060    }
061
062    @Override
063    public int[] getAcceptableTokens() {
064        return getRequiredTokens();
065    }
066
067    @Override
068    public void visitToken(DetailAST ast) {
069        // Strange logic in this method to guard against checking RPAREN tokens
070        // that are not associated with a TYPECAST token.
071        if (ast.getType() == TokenTypes.TYPECAST) {
072            processLeft(ast);
073        }
074        else if (ast.getParent().getType() == TokenTypes.TYPECAST
075                 && ast.getParent().findFirstToken(TokenTypes.RPAREN) == ast) {
076            processRight(ast);
077        }
078    }
079}