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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  }