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


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 assignements.
26  *
27  * @author o_sukhodolsky
28  */
29 public class AssignHandler 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 AssignHandler(IndentationCheck aIndentCheck,
40         DetailAST aAst, ExpressionHandler aParent)
41     {
42         super(aIndentCheck, "assign", aAst, aParent);
43     }
44
45     /**
46      * Check the indentation of the expression we are handling.
47      */
48     public void checkIndentation()
49     {
50         final IndentLevel expectedLevel = getChildrenExpectedLevel();
51
52         // check indentation of assign if it starts line
53 final DetailAST assign = getMainAst();
54         if (startsLine(assign)
55             && !expectedLevel.accept(expandedTabsColumnNo(assign)))
56         {
57             logError(assign, "" , expandedTabsColumnNo(assign), expectedLevel);
58         }
59
60         // check indentation of rvalue
61 DetailAST child = (DetailAST) assign.getFirstChild();
62
63         // if this is assign in expression then skip first child,
64 // because it's lvalue.
65 final DetailAST parent = assign.getParent();
66         if ((parent != null) && (parent.getType() == TokenTypes.EXPR)) {
67             child = (DetailAST) child.getNextSibling();
68         }
69         if ((parent != null)
70             && (parent.getType() == TokenTypes.ANNOTATION_MEMBER_VALUE_PAIR))
71         {
72             child = (DetailAST) assign.getNextSibling();
73         }
74
75         checkExpressionSubtree(child, expectedLevel, false, true);
76     }
77
78     /**
79      * @return true if indentation should be increased after
80      * fisrt line in checkLinesIndent()
81      * false otherwise
82      */
83     protected boolean shouldIncreaseIndent()
84     {
85         return false;
86     }
87
88     /** {@inheritDoc} */
89     public IndentLevel suggestedChildLevel(ExpressionHandler aChild)
90     {
91         final DetailAST assign = getMainAst();
92         final DetailAST child = aChild.getMainAst();
93
94         if (child == assign.getFirstChild()) {
95             // left side of assignment should have the same
96 // indentation as "assignment"
97 return getLevel();
98         }
99         if (startsLine(assign)) {
100             return new IndentLevel(expandedTabsColumnNo(assign));
101         }
102         return super.suggestedChildLevel(aChild);
103     }
104 }
105
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