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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.checks;

import com.liferay.portal.kernel.util.TextFormatter;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author Hugo Huijser
 */
public class EmptyCollectionCheck extends BaseFileCheck {

	@Override
	protected String doProcess(
		String fileName, String absolutePath, String content) {

		_checkEmptyCollection(fileName, content);

		return content;
	}

	private void _checkEmptyCollection(String fileName, String content) {
		Matcher matcher = _emptyCollectionPattern.matcher(content);

		while (matcher.find()) {
			String collectionType = TextFormatter.format(
				matcher.group(1), TextFormatter.J);

			addMessage(
				fileName, "Use Collections.empty" + collectionType + "()",
				getLineCount(content, matcher.start()));
		}
	}

	private final Pattern _emptyCollectionPattern = Pattern.compile(
		"Collections\\.EMPTY_(LIST|MAP|SET)");

}