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 net.sourceforge.pmd.AbstractRule;
7 import net.sourceforge.pmd.ast.ASTMethodDeclarator;
8 import net.sourceforge.pmd.symboltable.NameOccurrence;
9 import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
10
11 import java.util.Iterator;
12 import java.util.List;
13 import java.util.Map;
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.keySet().iterator(); i.hasNext();) {
20 VariableNameDeclaration decl = (VariableNameDeclaration) i.next();
21 List usages = (List) params.get(decl);
22 for (Iterator j = usages.iterator(); j.hasNext();) {
23 NameOccurrence occ = (NameOccurrence) j.next();
24 if ((occ.isOnLeftHandSide() || occ.isSelfAssignment()) && occ.getNameForWhichThisIsAQualifier() == null && !decl.isArray()) {
25 addViolation(data, decl.getNode(), decl.getImage());
26 }
27 }
28 }
29 return super.visit(node, data);
30 }
31 }