Utils.java

/*
 * Copyright (C) 2012 The Serval Project
 *
 * This file is part of the Serval Maps Data Manipulator Software
 *
 * Serval Maps Data Manipulator Software is free software; you can 
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation; either 
 * version 3 of the License, or (at your option) any later version.
 *
 * This source code 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.servalproject.maps.dataman;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.TimeZone;

/**
 * a collection of utility methods
 */
public class Utils {
	
	/**
	 * Check to see if a string is empty.
	 * 
	 * @param string the string to evaluate
	 * @return       true if the string is valid
	 */
	public static boolean isEmpty(String string) {
		if(string == null) {
			return true;
		}

		if(string.trim().equals("") == true) {
			return true;
		}

		return false;
	}
	
	/**
	 * Confirm that a file is accessible
	 * 
	 * @param path the path to check
	 * 
	 * @return true if the file at the supplied path can accessed
	 */
	public static boolean isFileAccessible(String path) {
		if(isEmpty(path) == true) {
			return false;
		}

		File mFile = new File(path);

		if(mFile.isFile() == true && mFile.canRead() == true) {
			return true;
        }

		return false;
	}
	
	/**
	 * build a string representing a time according to the KML specification
	 * 
	 * @param timestamp the time int UTC
	 * @param timezone the local timezone of the time
	 * @return a string representing the time according to the KML specification
	 */
	public static String buildTime(long time, String timeZone) {
		
		Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone(timeZone));
		calendar.setTimeInMillis(time);
		
		SimpleDateFormat formatDate = new SimpleDateFormat("yyyy-MM-dd");
		SimpleDateFormat formatTime = new SimpleDateFormat("HH:mm:ssZZ");
		
		String timeAsString = formatDate.format(calendar.getTime()) + "T" + formatTime.format(calendar.getTime());
		
		String token = timeAsString.substring(timeAsString.length() -2, timeAsString.length());
		
		timeAsString = timeAsString.substring(0, timeAsString.length() -2);
		
		return timeAsString + ":" + token;
		
		//return formatDate.format(calendar.getTime()) + "T" + formatTime.format(calendar.getTime());
		
	}

}