BenchmarkUtil.java

package at.favre.lib.dali.util;

import android.os.Build;
import android.os.SystemClock;

import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;


public class BenchmarkUtil {
	private static final DecimalFormat format = new DecimalFormat("#.0");
	private static final String fileSeperator = ";";

	static {
		format.setDecimalFormatSymbols(DecimalFormatSymbols.getInstance(Locale.ENGLISH));
		format.setRoundingMode(RoundingMode.HALF_UP);
	}

	private BenchmarkUtil(){}

	public static long elapsedRealTimeNanos() {
		if (Build.VERSION.SDK_INT >= 17) {
			return SystemClock.elapsedRealtimeNanos();
		}
		return SystemClock.elapsedRealtime() * 1000000l;
	}

	public static String formatNum(double number) {
		return format.format(number);
	}

	public static String formatNum(double number, String formatString) {
		final DecimalFormat format = new DecimalFormat(formatString);
		format.setDecimalFormatSymbols(DecimalFormatSymbols.getInstance(Locale.ENGLISH));
		format.setRoundingMode(RoundingMode.HALF_UP);
		return format.format(number);
	}

	public static String getScalingUnitByteSize(int byteSize) {
		double scaledByteSize = (double) byteSize;
		String unit = "byte";

		if(scaledByteSize < 1024) {
			return formatNum(scaledByteSize,"0.##")+unit;
		} else {
			unit = "KiB";
			scaledByteSize /= 1024d;

			if(scaledByteSize < 1024) {
				return formatNum(scaledByteSize,"0.##")+unit;
			} else {
				unit = "MiB";
				scaledByteSize /= 1024d;
				if(scaledByteSize < 1024) {
					return formatNum(scaledByteSize,"0.##")+unit;
				} else {
					unit = "GiB";
					scaledByteSize /= 1024d;
					return formatNum(scaledByteSize,"0.##")+unit;
				}
			}
		}
	}

	public static String getCurrentTime() {
		SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss.SSS", Locale.getDefault());
		return sdf.format(new Date());
	}
}