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Java > Open Source Codes > com > puppycrawl > tools > checkstyle > checks > j2ee > ThisParameterCheck


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.j2ee;
20
21 import com.puppycrawl.tools.checkstyle.api.Check;
22 import com.puppycrawl.tools.checkstyle.api.DetailAST;
23 import com.puppycrawl.tools.checkstyle.api.TokenTypes;
24
25 /**
26  * Checks that 'this' is not a parameter of any method calls
27  * or constructors for a bean.
28  * Instead, you must use the result of the getEJBObject()
29  * available in SessionContext or EntityContext.
30  * http://www.javaworld.com/javaworld/jw-08-2000/jw-0825-ejbrestrict.html
31  * @author Rick Giles
32  */
33 public class ThisParameterCheck
34     extends Check
35 {
36     /**
37      * {@inheritDoc}
38      */
39     public int[] getDefaultTokens()
40     {
41         return new int[] {TokenTypes.LITERAL_THIS};
42     }
43
44     /**
45      * {@inheritDoc}
46      */
47     public int[] getRequiredTokens()
48     {
49         return getDefaultTokens();
50     }
51
52     /**
53      * {@inheritDoc}
54      */
55     public void visitToken(DetailAST aAST)
56     {
57         if (Utils.isInEJB(aAST)) {
58             DetailAST parent = aAST.getParent();
59
60             // skip parentheses
61 while ((parent != null)
62                 && (parent.getType() == TokenTypes.LPAREN))
63             {
64                 parent = parent.getParent();
65             }
66
67             if ((parent != null)
68                 && (parent.getType() == TokenTypes.EXPR))
69             {
70                 parent = parent.getParent();
71                 if ((parent != null)
72                     && (parent.getType() == TokenTypes.ELIST))
73                 {
74                     log(
75                         aAST.getLineNo(),
76                         aAST.getColumnNo(),
77                         "thisparameter.bean");
78                 }
79             }
80         }
81     }
82 }
83
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