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Java > Open Source Codes > net > sourceforge > pmd > rules > AvoidReassigningParameters


1 /**
2  * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
3  */
4 package net.sourceforge.pmd.rules;
5
6 import java.util.Iterator JavaDoc;
7 import java.util.List JavaDoc;
8 import java.util.Map JavaDoc;
9
10 import net.sourceforge.pmd.AbstractRule;
11 import net.sourceforge.pmd.ast.ASTMethodDeclarator;
12 import net.sourceforge.pmd.symboltable.NameOccurrence;
13 import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
14
15 public class AvoidReassigningParameters extends AbstractRule {
16
17     public Object JavaDoc visit(ASTMethodDeclarator node, Object JavaDoc data) {
18         Map JavaDoc params = node.getScope().getVariableDeclarations();
19         for (Iterator JavaDoc i = params.entrySet().iterator(); i.hasNext();) {
20             Map.Entry JavaDoc entry = (Map.Entry JavaDoc) i.next();
21  
22             VariableNameDeclaration decl = (VariableNameDeclaration) entry.getKey();
23             List JavaDoc usages = (List JavaDoc) entry.getValue();
24             for (Iterator JavaDoc j = usages.iterator(); j.hasNext();) {
25                 NameOccurrence occ = (NameOccurrence) j.next();
26                 if ((occ.isOnLeftHandSide() || occ.isSelfAssignment()) &&
27                     occ.getNameForWhichThisIsAQualifier() == null &&
28                     (!decl.isArray() || occ.getLocation().jjtGetParent().jjtGetParent().jjtGetNumChildren() == 1))
29                 {
30                     // not an array or no primary suffix to access the array values
31 addViolation(data, decl.getNode(), decl.getImage());
32                 }
33             }
34         }
35         return super.visit(node, data);
36     }
37 }
38
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