1 package net.sourceforge.pmd.rules;
2
3 import net.sourceforge.pmd.AbstractRule;
4 import net.sourceforge.pmd.RuleContext;
5 import net.sourceforge.pmd.ast.ASTMethodDeclarator;
6 import net.sourceforge.pmd.symboltable.NameOccurrence;
7 import net.sourceforge.pmd.symboltable.Scope;
8 import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
9
10 import java.text.MessageFormat;
11 import java.util.Iterator;
12 import java.util.List;
13 import java.util.Map;
14
15 public class AvoidReassigningParametersRule extends AbstractRule {
16
17 public Object visit(ASTMethodDeclarator node, Object data) {
18 Scope scope = node.getScope();
19 Map params = scope.getVariableDeclarations(true);
20 for (Iterator i = params.keySet().iterator(); i.hasNext();) {
21 VariableNameDeclaration decl = (VariableNameDeclaration) i.next();
22 List usages = (List) params.get(decl);
23 for (Iterator j = usages.iterator(); j.hasNext();) {
24 NameOccurrence occ = (NameOccurrence) j.next();
25 if (occ.isOnLeftHandSide() && (occ.getNameForWhichThisIsAQualifier() == null)) {
26 RuleContext ctx = (RuleContext) data;
27 String msg = MessageFormat.format(getMessage(), new Object[]{decl.getImage()});
28 ctx.getReport().addRuleViolation(createRuleViolation(ctx, decl.getLine(), msg));
29 }
30 }
31 }
32 return super.visit(node, data);
33 }
34 }
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