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/*
* Copyright 2016-2022 The OSHI Project Contributors
* SPDX-License-Identifier: MIT
*/
package oshi.util;
import java.math.BigInteger;
import java.util.concurrent.TimeUnit;
import oshi.annotation.concurrent.ThreadSafe;
/**
* Formatting utility for appending units or converting between number types.
*/
@ThreadSafe
public final class FormatUtil {
/**
* Binary prefixes, used in IEC Standard for naming bytes.
* (https://en.wikipedia.org/wiki/International_Electrotechnical_Commission)
*
* Should be used for most representations of bytes
*/
private static final long KIBI = 1L << 10;
private static final long MEBI = 1L << 20;
private static final long GIBI = 1L << 30;
private static final long TEBI = 1L << 40;
private static final long PEBI = 1L << 50;
private static final long EXBI = 1L << 60;
/**
* Decimal prefixes, used for Hz and other metric units and for bytes by hard drive manufacturers
*/
private static final long KILO = 1_000L;
private static final long MEGA = 1_000_000L;
private static final long GIGA = 1_000_000_000L;
private static final long TERA = 1_000_000_000_000L;
private static final long PETA = 1_000_000_000_000_000L;
private static final long EXA = 1_000_000_000_000_000_000L;
/*
* Two's complement reference: 2^64.
*/
private static final BigInteger TWOS_COMPLEMENT_REF = BigInteger.ONE.shiftLeft(64);
/** Constant HEX_ERROR="0x%08X" */
public static final String HEX_ERROR = "0x%08X";
private FormatUtil() {
}
/**
* Format bytes into a rounded string representation using IEC standard (matches Mac/Linux). For hard drive
* capacities, use @link {@link #formatBytesDecimal(long)}. For Windows displays for KB, MB and GB, in JEDEC units,
* edit the returned string to remove the 'i' to display the (incorrect) JEDEC units.
*
* @param bytes Bytes.
* @return Rounded string representation of the byte size.
*/
public static String formatBytes(long bytes) {
if (bytes == 1L) { // bytes
return String.format("%d byte", bytes);
} else if (bytes < KIBI) { // bytes
return String.format("%d bytes", bytes);
} else if (bytes < MEBI) { // KiB
return formatUnits(bytes, KIBI, "KiB");
} else if (bytes < GIBI) { // MiB
return formatUnits(bytes, MEBI, "MiB");
} else if (bytes < TEBI) { // GiB
return formatUnits(bytes, GIBI, "GiB");
} else if (bytes < PEBI) { // TiB
return formatUnits(bytes, TEBI, "TiB");
} else if (bytes < EXBI) { // PiB
return formatUnits(bytes, PEBI, "PiB");
} else { // EiB
return formatUnits(bytes, EXBI, "EiB");
}
}
/**
* Format units as exact integer or fractional decimal based on the prefix, appending the appropriate units
*
* @param value The value to format
* @param prefix The divisor of the unit multiplier
* @param unit A string representing the units
* @return A string with the value
*/
private static String formatUnits(long value, long prefix, String unit) {
if (value % prefix == 0) {
return String.format("%d %s", value / prefix, unit);
}
return String.format("%.1f %s", (double) value / prefix, unit);
}
/**
* Format bytes into a rounded string representation using decimal SI units. These are used by hard drive
* manufacturers for capacity. Most other storage should use {@link #formatBytes(long)}.
*
* @param bytes Bytes.
* @return Rounded string representation of the byte size.
*/
public static String formatBytesDecimal(long bytes) {
if (bytes == 1L) { // bytes
return String.format("%d byte", bytes);
} else if (bytes < KILO) { // bytes
return String.format("%d bytes", bytes);
} else {
return formatValue(bytes, "B");
}
}
/**
* Format hertz into a string to a rounded string representation.
*
* @param hertz Hertz.
* @return Rounded string representation of the hertz size.
*/
public static String formatHertz(long hertz) {
return formatValue(hertz, "Hz");
}
/**
* Format arbitrary units into a string to a rounded string representation.
*
* @param value The value
* @param unit Units to append metric prefix to
* @return Rounded string representation of the value with metric prefix to extension
*/
public static String formatValue(long value, String unit) {
if (value < KILO) {
return String.format("%d %s", value, unit).trim();
} else if (value < MEGA) { // K
return formatUnits(value, KILO, "K" + unit);
} else if (value < GIGA) { // M
return formatUnits(value, MEGA, "M" + unit);
} else if (value < TERA) { // G
return formatUnits(value, GIGA, "G" + unit);
} else if (value < PETA) { // T
return formatUnits(value, TERA, "T" + unit);
} else if (value < EXA) { // P
return formatUnits(value, PETA, "P" + unit);
} else { // E
return formatUnits(value, EXA, "E" + unit);
}
}
/**
* Formats an elapsed time in seconds as days, hh:mm:ss.
*
* @param secs Elapsed seconds
* @return A string representation of elapsed time
*/
public static String formatElapsedSecs(long secs) {
long eTime = secs;
final long days = TimeUnit.SECONDS.toDays(eTime);
eTime -= TimeUnit.DAYS.toSeconds(days);
final long hr = TimeUnit.SECONDS.toHours(eTime);
eTime -= TimeUnit.HOURS.toSeconds(hr);
final long min = TimeUnit.SECONDS.toMinutes(eTime);
eTime -= TimeUnit.MINUTES.toSeconds(min);
final long sec = eTime;
return String.format("%d days, %02d:%02d:%02d", days, hr, min, sec);
}
/**
* Convert unsigned int to signed long.
*
* @param x Signed int representing an unsigned integer
* @return long value of x unsigned
*/
public static long getUnsignedInt(int x) {
return x & 0x0000_0000_ffff_ffffL;
}
/**
* Represent a 32 bit value as if it were an unsigned integer.
*
* This is a Java 7 implementation of Java 8's Integer.toUnsignedString.
*
* @param i a 32 bit value
* @return the string representation of the unsigned integer
*/
public static String toUnsignedString(int i) {
if (i >= 0) {
return Integer.toString(i);
}
return Long.toString(getUnsignedInt(i));
}
/**
* Represent a 64 bit value as if it were an unsigned long.
*
* This is a Java 7 implementation of Java 8's Long.toUnsignedString.
*
* @param l a 64 bit value
* @return the string representation of the unsigned long
*/
public static String toUnsignedString(long l) {
if (l >= 0) {
return Long.toString(l);
}
return BigInteger.valueOf(l).add(TWOS_COMPLEMENT_REF).toString();
}
/**
* Translate an integer error code to its hex notation
*
* @param errorCode The error code
* @return A string representing the error as 0x....
*/
public static String formatError(int errorCode) {
return String.format(HEX_ERROR, errorCode);
}
/**
* Rounds a floating point number to the nearest integer
*
* @param x the floating point number
* @return the integer
*/
public static int roundToInt(double x) {
return (int) Math.round(x);
}
}