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////////////////////////////////////////////////////////////////////////////////
019package com.puppycrawl.tools.checkstyle.checks.coding;
020
021import com.puppycrawl.tools.checkstyle.api.DetailAST;
022import com.puppycrawl.tools.checkstyle.api.TokenTypes;
023
024/**
025 * Restricts nested try-catch-finally blocks to a specified depth (default = 1).
026 * @author <a href="mailto:simon@redhillconsulting.com.au">Simon Harris</a>
027 */
028public final class NestedTryDepthCheck extends AbstractNestedDepthCheck
029{
030    /** default allowed nesting depth */
031    private static final int DEFAULT_MAX = 1;
032
033    /** Creates new check instance with default allowed nesting depth. */
034    public NestedTryDepthCheck()
035    {
036        super(DEFAULT_MAX);
037    }
038
039    @Override
040    public int[] getDefaultTokens()
041    {
042        return new int[] {TokenTypes.LITERAL_TRY};
043    }
044
045    @Override
046    public void visitToken(DetailAST ast)
047    {
048        switch (ast.getType()) {
049            case TokenTypes.LITERAL_TRY:
050                visitLiteralTry(ast);
051                break;
052            default:
053                throw new IllegalStateException(ast.toString());
054        }
055    }
056
057    @Override
058    public void leaveToken(DetailAST ast)
059    {
060        switch (ast.getType()) {
061            case TokenTypes.LITERAL_TRY:
062                leaveLiteralTry();
063                break;
064            default:
065                throw new IllegalStateException(ast.toString());
066        }
067    }
068
069    /**
070     * Increases current nesting depth.
071     * @param literalTry node for try.
072     */
073    private void visitLiteralTry(DetailAST literalTry)
074    {
075        nestIn(literalTry, "nested.try.depth");
076    }
077
078    /** Decreases current nesting depth */
079    private void leaveLiteralTry()
080    {
081        nestOut();
082    }
083}