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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 java.util.Iterator;
7   import java.util.List;
8   import java.util.Map;
9   
10  import net.sourceforge.pmd.AbstractRule;
11  import net.sourceforge.pmd.ast.ASTMethodDeclarator;
12  import net.sourceforge.pmd.symboltable.NameOccurrence;
13  import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
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.entrySet().iterator(); i.hasNext();) {
20              Map.Entry entry = (Map.Entry) i.next();
21   
22              VariableNameDeclaration decl = (VariableNameDeclaration) entry.getKey();
23              List usages = (List) entry.getValue();
24              for (Iterator j = usages.iterator(); j.hasNext();) {
25                  NameOccurrence occ = (NameOccurrence) j.next();
26                  if ((occ.isOnLeftHandSide() || occ.isSelfAssignment()) && 
27                      occ.getNameForWhichThisIsAQualifier() == null &&
28                      (!decl.isArray() || occ.getLocation().jjtGetParent().jjtGetParent().jjtGetNumChildren() == 1))
29                  {
30                      // not an array or no primary suffix to access the array values
31                      addViolation(data, decl.getNode(), decl.getImage());
32                  }
33              }
34          }
35          return super.visit(node, data);
36      }
37  }