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.ASTClassOrInterfaceDeclaration;
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 UnusedPrivateFieldRule extends AbstractRule {
16
17 public Object visit(ASTClassOrInterfaceDeclaration node, Object data) {
18 Map vars = node.getScope().getVariableDeclarations();
19 for (Iterator i = vars.keySet().iterator(); i.hasNext();) {
20 VariableNameDeclaration decl = (VariableNameDeclaration) i.next();
21 if (!decl.getAccessNodeParent().isPrivate() || isOK(decl.getImage())) {
22 continue;
23 }
24 if (!actuallyUsed((List) vars.get(decl))) {
25 addViolation(data, decl.getNode(), decl.getImage());
26 }
27 }
28 return super.visit(node, data);
29 }
30
31 private boolean actuallyUsed(List usages) {
32 for (Iterator j = usages.iterator(); j.hasNext();) {
33 NameOccurrence nameOccurrence = (NameOccurrence) j.next();
34 if (!nameOccurrence.isOnLeftHandSide()) {
35 return true;
36 }
37 }
38 return false;
39 }
40
41 private boolean isOK(String image) {
42 return image.equals("serialVersionUID") || image.equals("serialPersistentFields") || image.equals("IDENT");
43 }
44 }