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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.petra.string.StringPool;
import com.liferay.portal.kernel.util.StringUtil;
import com.liferay.portal.kernel.util.Validator;

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

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

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

		if (content.contains("SystemException")) {
			content = _fixSystemExceptions(content);
		}

		return content;
	}

	private String _fixSystemExceptions(String content) {
		Matcher matcher = _throwsSystemExceptionPattern.matcher(content);

		if (!matcher.find()) {
			return content;
		}

		String match = matcher.group();
		String replacement = null;

		String afterException = matcher.group(3);
		String beforeException = matcher.group(2);

		if (Validator.isNull(beforeException) &&
			Validator.isNull(afterException)) {

			replacement = matcher.group(4);

			String beforeThrows = matcher.group(1);

			if (Validator.isNotNull(StringUtil.trim(beforeThrows))) {
				replacement = beforeThrows + replacement;
			}
		}
		else if (Validator.isNull(beforeException)) {
			replacement = StringUtil.replaceFirst(
				match, "SystemException, ", StringPool.BLANK);
		}
		else {
			replacement = StringUtil.replaceFirst(
				match, ", SystemException", StringPool.BLANK);
		}

		if (match.equals(replacement)) {
			return content;
		}

		return _fixSystemExceptions(
			StringUtil.replaceFirst(content, match, replacement));
	}

	private final Pattern _throwsSystemExceptionPattern = Pattern.compile(
		"(\n\t+.*)throws(.*) SystemException(.*)( \\{|;\n)");

}