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Liferay Source Formatter

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.source.formatter.checkstyle.checks;

import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;

import java.util.List;

/**
 * @author Hugo Huijser
 */
public class UnusedVariableCheck extends BaseCheck {

	@Override
	public int[] getDefaultTokens() {
		return new int[] {TokenTypes.VARIABLE_DEF};
	}

	@Override
	protected void doVisitToken(DetailAST detailAST) {
		DetailAST parentDetailAST = detailAST.getParent();

		if (parentDetailAST.getType() == TokenTypes.OBJBLOCK) {
			parentDetailAST = parentDetailAST.getParent();

			if (parentDetailAST.getParent() != null) {
				return;
			}
		}
		else if (parentDetailAST.getType() != TokenTypes.SLIST) {
			return;
		}

		DetailAST modifiersDetailAST = detailAST.findFirstToken(
			TokenTypes.MODIFIERS);

		if (modifiersDetailAST.branchContains(TokenTypes.ANNOTATION) ||
			modifiersDetailAST.branchContains(TokenTypes.LITERAL_PROTECTED) ||
			modifiersDetailAST.branchContains(TokenTypes.LITERAL_PUBLIC)) {

			return;
		}

		DetailAST nameDetailAST = detailAST.findFirstToken(TokenTypes.IDENT);

		String variableName = nameDetailAST.getText();

		if (variableName.equals("serialVersionUID")) {
			return;
		}

		List variableCallerDetailASTList =
			getVariableCallerDetailASTList(detailAST, variableName);

		if (variableCallerDetailASTList.isEmpty()) {
			log(detailAST, _MSG_UNUSED_VARIABLE, variableName);
		}
	}

	private static final String _MSG_UNUSED_VARIABLE = "variable.unused";

}