StringUtils.java

package codeine.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;

import com.google.common.base.Function;

public class StringUtils {

	public static String EMPTY = "";
	
	public static String formatTimePeriod(long millis) {
		long seconds = (millis / 1000) % 60;
		long minutes = (millis / (1000 * 60)) % 60;
		long hours = (millis / (1000 * 60 * 60));// %24;
		long onlyMillis = millis % 1000;
		boolean hasMillis = onlyMillis > 0;
		if (hours > 0){
			String format = "%d:%02d:%02d";
			if (hasMillis){
				format += ".%03d";
			}
			else {
				format += ".0";
			}
			return String.format(format, hours, minutes, seconds, onlyMillis);
		}
		else if (minutes > 0){
			String format = "%d:%02d";
			if (hasMillis){
				format += ".%03d";
			}
			else {
				format += ".0";
			}
			return String.format(format, minutes, seconds, onlyMillis);
		}
		else if (seconds > 0){
			String format = "%d";
			if (hasMillis){
				format += ".%03d seconds";
			}
			else {
				format += ".0 seconds";
			}
			return String.format(format, seconds, onlyMillis);
		}
		else {
			return String.format("%d milliseconds", onlyMillis);
		}
		
	}

	public static String formatDate(long date) {
		SimpleDateFormat sdf = new SimpleDateFormat("HH:mm - dd/MM/yyyy");
        Date resultdate = new Date(date);
		return sdf.format(resultdate);
	}
	
	public static Date parseDate(String date) throws ParseException {
		SimpleDateFormat sdf = new SimpleDateFormat("HH:mm - dd/MM/yyyy");
		return sdf.parse(date);
	}
	
	public static String[] getEnumNames(Class<? extends Enum<?>> e) {
	    return Arrays.toString(e.getEnumConstants()).replaceAll("\\[|]", "").split(", ");
	}
	
	public static boolean isEmpty(String string) {
		return null == string || "".equals(string.trim());
	}

	public static String safeToString(Object obj) {
		if (null == obj){
			return "";
		}
		return obj.toString();
	}
	public static String nullSafeToString(Object obj) {
		if (null == obj){
			return "null";
		}
		return obj.toString();
	}
	
	public static String collectionToString(Collection<?> c){
		return collectionToString(c, " ");
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static String collectionToString(Collection<?> c, String delimiter) {
		Function predicate = new Function<Object, String>() {
			@Override
			public String apply(Object input) {
				return nullSafeToString(input);
			}
		};
		return collectionToString(c, predicate, delimiter);
	}
	public static <T> String collectionToString(Collection<T> c, Function<T, String> function){
		return collectionToString(c, function, " ");
	}

	private static <T> String collectionToString(Collection<T> c, Function<T, String> function, String delimiter) {
		String $ = "";
		boolean first = true;
		for (T object : c) {
			if (first){
				first = false;
			}
			else {
				$ += delimiter;
			}
			$ += function.apply(object);
		}
		return $;
	}

	public static String toLowerCase(String string) {
		if (null == string) {
			return null;
		}
		return string.toLowerCase();
	}

	public static String trimStringToMaxLength(String s, int size) {
		if (s.length() > size) {
			String substring = s.substring(0, size);
			int lastIndexOf = substring.lastIndexOf(" ");
			return lastIndexOf == -1 ? substring + "... and some more." : substring.substring(0, lastIndexOf)
					+ "... and some more.";
		}
		return s;
	
	}

	public static String arrayToString(Object[] arr) {
		return collectionToString(Arrays.asList(arr));
	}
	
}