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 }