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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 net.sourceforge.pmd.ast.ASTClassOrInterfaceDeclaration;
7   import net.sourceforge.pmd.ast.ASTLocalVariableDeclaration;
8   import net.sourceforge.pmd.ast.ASTMethodDeclaration;
9   
10  public class LocalVariableCouldBeFinal extends AbstractOptimizationRule {
11  
12      public Object visit(ASTClassOrInterfaceDeclaration node, Object data) {
13          if (node.isInterface()) {
14              return data;
15          }
16          return super.visit(node, data);
17      }
18  
19      public Object visit(ASTLocalVariableDeclaration node, Object data) {
20          if (node.isFinal()) {
21              return data;
22          }
23          final String varName = getVarName(node);
24  
25          ASTMethodDeclaration md = (ASTMethodDeclaration) node.getFirstParentOfType(ASTMethodDeclaration.class);
26          if (md != null) {
27              if (!isVarWritterInMethod(varName, md)) {
28                  addViolation(data, node);
29              }
30          }
31          return data;
32      }
33  
34  }