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Java > Open Source Codes > com > puppycrawl > tools > checkstyle > checks > indentation > LabelHandler


1 ////////////////////////////////////////////////////////////////////////////////
2 // checkstyle: Checks Java source code for adherence to a set of rules.
3 // Copyright (C) 2001-2005 Oliver Burn
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ////////////////////////////////////////////////////////////////////////////////
19 package com.puppycrawl.tools.checkstyle.checks.indentation;
20
21 import com.puppycrawl.tools.checkstyle.api.DetailAST;
22 import com.puppycrawl.tools.checkstyle.api.TokenTypes;
23
24 /**
25  * Handler for labels.
26  *
27  * @author jrichard
28  */
29 public class LabelHandler extends ExpressionHandler
30 {
31     /**
32      * The types of expressions that are children of a label.
33      */
34     private final int[] mLabelChildren = new int[] {
35         TokenTypes.IDENT,
36     };
37
38     /**
39      * Construct an instance of this handler with the given indentation check,
40      * abstract syntax tree, and parent handler.
41      *
42      * @param aIndentCheck the indentation check
43      * @param aExpr the abstract syntax tree
44      * @param aParent the parent handler
45      */
46     public LabelHandler(IndentationCheck aIndentCheck,
47         DetailAST aExpr, ExpressionHandler aParent)
48     {
49         super(aIndentCheck, "label", aExpr, aParent);
50     }
51
52     /**
53      * Compute the indentation amount for this handler.
54      *
55      * @return the expected indentation amount
56      */
57     protected IndentLevel getLevelImpl()
58     {
59         return new IndentLevel(super.getLevelImpl(), -getBasicOffset());
60     }
61
62     /**
63      * Check the indentation of the label.
64      */
65     private void checkLabel()
66     {
67         checkChildren(getMainAst(), mLabelChildren, getLevel(), true, false);
68     }
69
70     /**
71      * Check the indentation of the expression we are handling.
72      */
73     public void checkIndentation()
74     {
75         checkLabel();
76         // need to check children (like 'block' parents do)
77 final DetailAST parent = (DetailAST)
78             getMainAst().getFirstChild().getNextSibling();
79
80         final IndentLevel expected =
81             new IndentLevel(getLevel(), getBasicOffset());
82
83         checkExpressionSubtree(parent, expected, true, false);
84     }
85 }
86
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