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


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 case statements.
26  *
27  * @author jrichard
28  */
29 public class CaseHandler extends ExpressionHandler
30 {
31     /**
32      * The child elements of a case expression.
33      */
34     private final int[] mCaseChildren = new int[] {
35         TokenTypes.LITERAL_CASE,
36         TokenTypes.LITERAL_DEFAULT,
37     };
38
39     /**
40      * Construct an instance of this handler with the given indentation check,
41      * abstract syntax tree, and parent handler.
42      *
43      * @param aIndentCheck the indentation check
44      * @param aExpr the abstract syntax tree
45      * @param aParent the parent handler
46      */
47     public CaseHandler(IndentationCheck aIndentCheck,
48         DetailAST aExpr, ExpressionHandler aParent)
49     {
50         super(aIndentCheck, "case", aExpr, aParent);
51     }
52
53     /**
54      * Compute the indentation amount for this handler.
55      *
56      * @return the expected indentation amount
57      */
58     protected IndentLevel getLevelImpl()
59     {
60         return new IndentLevel(getParent().getLevel(),
61                                getIndentCheck().getCaseIndent());
62     }
63
64     /**
65      * Check the indentation of the case statement.
66      */
67     private void checkCase()
68     {
69         checkChildren(getMainAst(), mCaseChildren, getLevel(), true, false);
70     }
71
72     /**
73      * Indentation level suggested for a child element. Children don't have
74      * to respect this, but most do.
75      *
76      * @param aChild child AST (so suggestion level can differ based on child
77      * type)
78      *
79      * @return suggested indentation for child
80      */
81     public IndentLevel suggestedChildLevel(ExpressionHandler aChild)
82     {
83         return getLevel();
84     }
85
86     /**
87      * Check the indentation of the expression we are handling.
88      */
89     public void checkIndentation()
90     {
91         checkCase();
92     }
93 }
94
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