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;
7 import java.util.List;
8 import java.util.Map;
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 visit(ASTMethodDeclarator node, Object data) {
18 Map params = node.getScope().getVariableDeclarations();
19 for (Iterator i = params.entrySet().iterator(); i.hasNext();) {
20 Map.Entry entry = (Map.Entry) i.next();
21
22 VariableNameDeclaration decl = (VariableNameDeclaration) entry.getKey();
23 List usages = (List) entry.getValue();
24 for (Iterator 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
31 addViolation(data, decl.getNode(), decl.getImage());
32 }
33 }
34 }
35 return super.visit(node, data);
36 }
37 }