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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.optimization;
5   
6   import java.util.Iterator;
7   import java.util.List;
8   import java.util.Map;
9   
10  import net.sourceforge.pmd.ast.ASTLocalVariableDeclaration;
11  import net.sourceforge.pmd.symboltable.Scope;
12  import net.sourceforge.pmd.symboltable.VariableNameDeclaration;
13  
14  public class LocalVariableCouldBeFinal extends AbstractOptimizationRule {
15  
16      public Object visit(ASTLocalVariableDeclaration node, Object data) {
17          if (node.isFinal()) {
18              return data;
19          }
20          Scope s = node.getScope();
21          Map decls = s.getVariableDeclarations();
22          for (Iterator i = decls.entrySet().iterator(); i.hasNext();) {
23              Map.Entry entry = (Map.Entry) i.next();
24              VariableNameDeclaration var = (VariableNameDeclaration) entry.getKey();
25              if (var.getAccessNodeParent() != node) {
26                  continue;
27              }
28              if (!assigned((List) entry.getValue())) {
29                  addViolation(data, var.getAccessNodeParent(), var.getImage());
30              }
31          }
32          return data;
33      }
34  
35  }