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////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle.checks.coding;
021
022import com.puppycrawl.tools.checkstyle.api.Check;
023import com.puppycrawl.tools.checkstyle.api.TokenTypes;
024import com.puppycrawl.tools.checkstyle.api.DetailAST;
025
026/**
027 * <p>
028 * Detects empty statements (standalone ';').
029 * Empty statements often introduce bugs
030 * that are hard to spot, such as in
031 * </p>
032 * <pre>
033 * if (someCondition);
034 *   doConditionalStuff();
035 * doUnconditionalStuff();
036 * </pre>
037 * <p>
038 * An example of how to configure the check is:
039 * </p>
040 * <pre>
041 * &lt;module name="EmptyStatement"/&gt;
042 * </pre>
043 * @author Rick Giles
044 * @version 1.0
045 */
046public class EmptyStatementCheck extends Check
047{
048    @Override
049    public int[] getDefaultTokens()
050    {
051        return new int[] {TokenTypes.EMPTY_STAT};
052    }
053
054    @Override
055    public void visitToken(DetailAST ast)
056    {
057        log(ast.getLineNo(), ast.getColumnNo(), "empty.statement");
058    }
059}