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| package net.sourceforge.pmd.rules; |
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| import net.sourceforge.pmd.AbstractRule; |
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| import net.sourceforge.pmd.ast.ASTClassOrInterfaceDeclaration; |
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| import net.sourceforge.pmd.symboltable.NameOccurrence; |
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| import net.sourceforge.pmd.symboltable.VariableNameDeclaration; |
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| import java.util.Iterator; |
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| import java.util.List; |
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| import java.util.Map; |
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| public class UnusedPrivateFieldRule extends AbstractRule { |
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| public Object visit(ASTClassOrInterfaceDeclaration node, Object data) {
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| Map vars = node.getScope().getVariableDeclarations();
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| for (Iterator i = vars.entrySet().iterator(); i.hasNext();) {
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| Map.Entry entry = (Map.Entry) i.next();
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| VariableNameDeclaration decl = (VariableNameDeclaration) entry.getKey();
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| if (!decl.getAccessNodeParent().isPrivate() || isOK(decl.getImage())) {
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| continue;
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| } |
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| if (!actuallyUsed((List) entry.getValue())) {
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| addViolation(data, decl.getNode(), decl.getImage());
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| } |
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| } |
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| return super.visit(node, data);
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| } |
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| private boolean actuallyUsed(List usages) {
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| for (Iterator j = usages.iterator(); j.hasNext();) {
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| NameOccurrence nameOccurrence = (NameOccurrence) j.next();
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| if (!nameOccurrence.isOnLeftHandSide()) {
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| return true;
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| } |
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| } |
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| return false;
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| } |
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| private boolean isOK(String image) {
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| return image.equals("serialVersionUID") || image.equals("serialPersistentFields") || image.equals("IDENT");
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| } |
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| } |