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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  }