KickJava   Java API By Example, From Geeks To Geeks.

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


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 switch statements.
26  *
27  * @author jrichard
28  */
29 public class SwitchHandler extends BlockParentHandler
30 {
31     /**
32      * Construct an instance of this handler with the given indentation check,
33      * abstract syntax tree, and parent handler.
34      *
35      * @param aIndentCheck the indentation check
36      * @param aAst the abstract syntax tree
37      * @param aParent the parent handler
38      */
39     public SwitchHandler(IndentationCheck aIndentCheck,
40         DetailAST aAst, ExpressionHandler aParent)
41     {
42         super(aIndentCheck, "switch", aAst, aParent);
43     }
44
45     /**
46      * Get the left curly brace portion of the expression we are handling.
47      *
48      * @return the left curly brace expression
49      */
50     protected DetailAST getLCurly()
51     {
52         return getMainAst().findFirstToken(TokenTypes.LCURLY);
53     }
54
55     /**
56      * Get the right curly brace portion of the expression we are handling.
57      *
58      * @return the right curly brace expression
59      */
60     protected DetailAST getRCurly()
61     {
62         return getMainAst().findFirstToken(TokenTypes.RCURLY);
63     }
64
65     /**
66      * There is no list of statements child for this handler.
67      *
68      * @return null
69      */
70     protected DetailAST getListChild()
71     {
72         // all children should be taken care of by case handler (plus
73 // there is no parent of just the cases, if checking is needed
74 // here in the future, an additional way beyond checkChildren()
75 // will have to be devised to get children)
76 return null;
77     }
78
79     /**
80      * There is no child element that is not a list of statements.
81      *
82      * @return null
83      */
84     protected DetailAST getNonlistChild()
85     {
86         return null;
87     }
88
89     /**
90      * Check the indentation of the switch expression.
91      */
92     private void checkSwitchExpr()
93     {
94         checkExpressionSubtree(
95             (DetailAST) getMainAst().findFirstToken(TokenTypes.LPAREN).
96                 getNextSibling(),
97             getLevel(),
98             false,
99             false);
100     }
101
102     /**
103      * Check the indentation of the expression we are handling.
104      */
105     public void checkIndentation()
106     {
107         checkSwitchExpr();
108         super.checkIndentation();
109     }
110 }
111
Popular Tags