SyncWatchEventComparator.java

/**
 * 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.sync.engine.document.library.util.comparator;

import com.liferay.sync.engine.model.SyncFile;
import com.liferay.sync.engine.model.SyncWatchEvent;

import java.util.Comparator;

/**
 * @author Dennis Ju
 */
public class SyncWatchEventComparator implements Comparator<SyncWatchEvent> {

	@Override
	public int compare(
		SyncWatchEvent syncWatchEvent1, SyncWatchEvent syncWatchEvent2) {

		String fileType1 = syncWatchEvent1.getFileType();
		String fileType2 = syncWatchEvent2.getFileType();

		if (!fileType1.equals(fileType2)) {
			if (fileType1.equals(SyncFile.TYPE_FOLDER)) {
				return -1;
			}
			else {
				return 1;
			}
		}

		String eventType1 = syncWatchEvent1.getEventType();
		String eventType2 = syncWatchEvent2.getEventType();

		if (eventType1.equals(SyncWatchEvent.EVENT_TYPE_CREATE) &&
			eventType2.equals(SyncWatchEvent.EVENT_TYPE_DELETE)) {

			return -1;
		}
		else if (eventType1.equals(SyncWatchEvent.EVENT_TYPE_DELETE) &&
				 eventType2.equals(SyncWatchEvent.EVENT_TYPE_CREATE)) {

			return 1;
		}

		return Long.compare(
			syncWatchEvent1.getSyncWatchEventId(),
			syncWatchEvent2.getSyncWatchEventId());
	}

}