////////////////////////////////////////////////////////////////////////////////

 // checkstyle: Checks Java source code for adherence to a set of rules.

 // Copyright (C) 2001-2014  Oliver Burn

 //

 // This library is free software; you can redistribute it and/or

 // modify it under the terms of the GNU Lesser General Public

 // License as published by the Free Software Foundation; either

 // version 2.1 of the License, or (at your option) any later version.

 //

 // This library is distributed in the hope that it will be useful,

 // but WITHOUT ANY WARRANTY; without even the implied warranty of

 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 // Lesser General Public License for more details.

 //

 // You should have received a copy of the GNU Lesser General Public

 // License along with this library; if not, write to the Free Software

 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 ////////////////////////////////////////////////////////////////////////////////

 package com.puppycrawl.tools.checkstyle.checks.indentation;

 import com.puppycrawl.tools.checkstyle.api.DetailAST;

 import com.puppycrawl.tools.checkstyle.api.TokenTypes;

 /**

  * Handler for labels.

  *

  * @author jrichard

  */

 public class LabelHandler extends ExpressionHandler

 {

     /**

      * The types of expressions that are children of a label.

      */

     private final int[] mLabelChildren = new int[] {

         TokenTypes.IDENT,

     };

     /**

      * Construct an instance of this handler with the given indentation check,

      * abstract syntax tree, and parent handler.

      *

      * @param aIndentCheck   the indentation check

      * @param aExpr          the abstract syntax tree

      * @param aParent        the parent handler

      */

     public LabelHandler(IndentationCheck aIndentCheck,

         DetailAST aExpr, ExpressionHandler aParent)

     {

         super(aIndentCheck, "label", aExpr, aParent);

     }

     @Override

     protected IndentLevel getLevelImpl()

     {

         return new IndentLevel(super.getLevelImpl(), -getBasicOffset());

     }

     /**

      * Check the indentation of the label.

      */

     private void checkLabel()

     {

         checkChildren(getMainAst(), mLabelChildren, getLevel(), true, false);

     }

     @Override

     public void checkIndentation()

     {

         checkLabel();

         // need to check children (like 'block' parents do)

         final DetailAST parent = getMainAst().getFirstChild().getNextSibling();

         final IndentLevel expected =

             new IndentLevel(getLevel(), getBasicOffset());

         checkExpressionSubtree(parent, expected, true, false);

     }

 }