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


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 else blocks.
26  *
27  * @author jrichard
28  */
29 public class ElseHandler 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 ElseHandler(IndentationCheck aIndentCheck,
40         DetailAST aAst, ExpressionHandler aParent)
41     {
42         super(aIndentCheck, "else", aAst, aParent);
43     }
44
45     /**
46      * Check the indent of the top level token.
47      */
48     protected void checkToplevelToken()
49     {
50         // check if else is nested with rcurly of if:
51 //
52 // } else ...
53
54         final DetailAST ifAST = getMainAst().getParent();
55         if (ifAST != null) {
56             final DetailAST slist = ifAST.findFirstToken(TokenTypes.SLIST);
57             if (slist != null) {
58                 final DetailAST lcurly = slist.getLastChild();
59                 if ((lcurly != null)
60                     && (lcurly.getLineNo() == getMainAst().getLineNo()))
61                 {
62                     // indentation checked as part of LITERAL IF check
63 return;
64                 }
65             }
66         }
67         super.checkToplevelToken();
68     }
69
70     /**
71      * Get the child element that is not a list of statements.
72      *
73      * @return the non-list child element
74      */
75     protected DetailAST getNonlistChild()
76     {
77         return (DetailAST) getMainAst().getFirstChild();
78     }
79 }
80
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