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.List;
7 import java.util.Map;
8
9 import net.sourceforge.pmd.ast.ASTLocalVariableDeclaration;
10 import net.sourceforge.pmd.symboltable.NameOccurrence;
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<VariableNameDeclaration, List<NameOccurrence>> decls = s.getVariableDeclarations();
22 for (Map.Entry<VariableNameDeclaration, List<NameOccurrence>> entry: decls.entrySet()) {
23 VariableNameDeclaration var = entry.getKey();
24 if (var.getAccessNodeParent() != node) {
25 continue;
26 }
27 if (!assigned(entry.getValue())) {
28 addViolation(data, var.getAccessNodeParent(), var.getImage());
29 }
30 }
31 return data;
32 }
33
34 }