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.RuleContext;
8 import net.sourceforge.pmd.ast.ASTMethodDeclarator;
9 import net.sourceforge.pmd.ast.ASTType;
10 import net.sourceforge.pmd.symboltable.NameOccurrence;
11 import net.sourceforge.pmd.symboltable.Scope;
12 import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
13 import net.sourceforge.pmd.symboltable.LocalScope;
14 import net.sourceforge.pmd.symboltable.MethodScope;
15 import net.sourceforge.pmd.symboltable.NameDeclaration;
16
17 import java.text.MessageFormat;
18 import java.util.Iterator;
19 import java.util.List;
20 import java.util.Map;
21
22 public class AvoidReassigningParametersRule extends AbstractRule {
23
24 public Object visit(ASTMethodDeclarator node, Object data) {
25 Scope scope = node.getScope();
26 Map params = scope.getVariableDeclarations(true);
27 for (Iterator i = params.keySet().iterator(); i.hasNext();) {
28 VariableNameDeclaration decl = (VariableNameDeclaration) i.next();
29 List usages = (List) params.get(decl);
30 for (Iterator j = usages.iterator(); j.hasNext();) {
31 NameOccurrence occ = (NameOccurrence) j.next();
32 if (occ.isOnLeftHandSide() && occ.getNameForWhichThisIsAQualifier() == null && !decl.isArray()) {
33 RuleContext ctx = (RuleContext) data;
34 String msg = MessageFormat.format(getMessage(), new Object[]{decl.getImage()});
35 ctx.getReport().addRuleViolation(createRuleViolation(ctx, decl.getLine(), msg));
36 }
37 }
38 }
39 return super.visit(node, data);
40 }
41 }
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