// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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package com.google.protobuf.util;
import static com.google.common.math.IntMath.checkedAdd;
import static com.google.common.math.IntMath.checkedSubtract;
import static com.google.common.math.LongMath.checkedAdd;
import static com.google.common.math.LongMath.checkedMultiply;
import static com.google.common.math.LongMath.checkedSubtract;
import static com.google.protobuf.util.Timestamps.MICROS_PER_SECOND;
import static com.google.protobuf.util.Timestamps.MILLIS_PER_SECOND;
import static com.google.protobuf.util.Timestamps.NANOS_PER_MICROSECOND;
import static com.google.protobuf.util.Timestamps.NANOS_PER_MILLISECOND;
import static com.google.protobuf.util.Timestamps.NANOS_PER_SECOND;
import com.google.protobuf.Duration;
import java.text.ParseException;
import java.util.Comparator;
/**
* Utilities to help create/manipulate {@code protobuf/duration.proto}. All operations throw an
* {@link IllegalArgumentException} if the input(s) are not {@linkplain #isValid(Duration) valid}.
*/
public final class Durations {
static final long DURATION_SECONDS_MIN = -315576000000L;
static final long DURATION_SECONDS_MAX = 315576000000L;
/** A constant holding the minimum valid {@link Duration}, approximately {@code -10,000} years. */
public static final Duration MIN_VALUE =
Duration.newBuilder().setSeconds(DURATION_SECONDS_MIN).setNanos(-999999999).build();
/** A constant holding the maximum valid {@link Duration}, approximately {@code +10,000} years. */
public static final Duration MAX_VALUE =
Duration.newBuilder().setSeconds(DURATION_SECONDS_MAX).setNanos(999999999).build();
private Durations() {}
private static final Comparator<Duration> COMPARATOR =
new Comparator<Duration>() {
@Override
public int compare(Duration d1, Duration d2) {
checkValid(d1);
checkValid(d2);
int secDiff = Long.compare(d1.getSeconds(), d2.getSeconds());
return (secDiff != 0) ? secDiff : Integer.compare(d1.getNanos(), d2.getNanos());
}
};
/**
* Returns a {@link Comparator} for {@link Duration}s which sorts in increasing chronological
* order. Nulls and invalid {@link Duration}s are not allowed (see {@link #isValid}).
*/
public static Comparator<Duration> comparator() {
return COMPARATOR;
}
/**
* Compares two durations. The value returned is identical to what would be returned by:
* {@code Durations.comparator().compare(x, y)}.
*
* @return the value {@code 0} if {@code x == y}; a value less than {@code 0} if {@code x < y};
* and a value greater than {@code 0} if {@code x > y}
*/
public static int compare(Duration x, Duration y) {
return COMPARATOR.compare(x, y);
}
/**
* Returns true if the given {@link Duration} is valid. The {@code seconds} value must be in the
* range [-315,576,000,000, +315,576,000,000]. The {@code nanos} value must be in the range
* [-999,999,999, +999,999,999].
*
* <p><b>Note:</b> Durations less than one second are represented with a 0 {@code seconds} field
* and a positive or negative {@code nanos} field. For durations of one second or more, a non-zero
* value for the {@code nanos} field must be of the same sign as the {@code seconds} field.
*/
public static boolean isValid(Duration duration) {
return isValid(duration.getSeconds(), duration.getNanos());
}
/**
* Returns true if the given number of seconds and nanos is a valid {@link Duration}. The {@code
* seconds} value must be in the range [-315,576,000,000, +315,576,000,000]. The {@code nanos}
* value must be in the range [-999,999,999, +999,999,999].
*
* <p><b>Note:</b> Durations less than one second are represented with a 0 {@code seconds} field
* and a positive or negative {@code nanos} field. For durations of one second or more, a non-zero
* value for the {@code nanos} field must be of the same sign as the {@code seconds} field.
*/
public static boolean isValid(long seconds, int nanos) {
if (seconds < DURATION_SECONDS_MIN || seconds > DURATION_SECONDS_MAX) {
return false;
}
if (nanos < -999999999L || nanos >= NANOS_PER_SECOND) {
return false;
}
if (seconds < 0 || nanos < 0) {
if (seconds > 0 || nanos > 0) {
return false;
}
}
return true;
}
/** Throws an {@link IllegalArgumentException} if the given {@link Duration} is not valid. */
public static Duration checkValid(Duration duration) {
long seconds = duration.getSeconds();
int nanos = duration.getNanos();
if (!isValid(seconds, nanos)) {
throw new IllegalArgumentException(String.format(
"Duration is not valid. See proto definition for valid values. "
+ "Seconds (%s) must be in range [-315,576,000,000, +315,576,000,000]. "
+ "Nanos (%s) must be in range [-999,999,999, +999,999,999]. "
+ "Nanos must have the same sign as seconds", seconds, nanos));
}
return duration;
}
/**
* Convert Duration to string format. The string format will contains 3, 6, or 9 fractional digits
* depending on the precision required to represent the exact Duration value. For example: "1s",
* "1.010s", "1.000000100s", "-3.100s" The range that can be represented by Duration is from
* -315,576,000,000 to +315,576,000,000 inclusive (in seconds).
*
* @return The string representation of the given duration.
* @throws IllegalArgumentException if the given duration is not in the valid range.
*/
public static String toString(Duration duration) {
checkValid(duration);
long seconds = duration.getSeconds();
int nanos = duration.getNanos();
StringBuilder result = new StringBuilder();
if (seconds < 0 || nanos < 0) {
result.append("-");
seconds = -seconds;
nanos = -nanos;
}
result.append(seconds);
if (nanos != 0) {
result.append(".");
result.append(Timestamps.formatNanos(nanos));
}
result.append("s");
return result.toString();
}
/**
* Parse from a string to produce a duration.
*
* @return A Duration parsed from the string.
* @throws ParseException if parsing fails.
*/
public static Duration parse(String value) throws ParseException {
// Must ended with "s".
if (value.isEmpty() || value.charAt(value.length() - 1) != 's') {
throw new ParseException("Invalid duration string: " + value, 0);
}
boolean negative = false;
if (value.charAt(0) == '-') {
negative = true;
value = value.substring(1);
}
String secondValue = value.substring(0, value.length() - 1);
String nanoValue = "";
int pointPosition = secondValue.indexOf('.');
if (pointPosition != -1) {
nanoValue = secondValue.substring(pointPosition + 1);
secondValue = secondValue.substring(0, pointPosition);
}
long seconds = Long.parseLong(secondValue);
int nanos = nanoValue.isEmpty() ? 0 : Timestamps.parseNanos(nanoValue);
if (seconds < 0) {
throw new ParseException("Invalid duration string: " + value, 0);
}
if (negative) {
seconds = -seconds;
nanos = -nanos;
}
try {
return normalizedDuration(seconds, nanos);
} catch (IllegalArgumentException e) {
throw new ParseException("Duration value is out of range.", 0);
}
}
/** Create a Duration from the number of seconds. */
public static Duration fromSeconds(long seconds) {
return normalizedDuration(seconds, 0);
}
/**
* Convert a Duration to the number of seconds. The result will be rounded towards 0 to the
* nearest second. E.g., if the duration represents -1 nanosecond, it will be rounded to 0.
*/
public static long toSeconds(Duration duration) {
return checkValid(duration).getSeconds();
}
/** Create a Duration from the number of milliseconds. */
public static Duration fromMillis(long milliseconds) {
return normalizedDuration(
milliseconds / MILLIS_PER_SECOND,
(int) (milliseconds % MILLIS_PER_SECOND * NANOS_PER_MILLISECOND));
}
/**
* Convert a Duration to the number of milliseconds. The result will be rounded towards 0 to the
* nearest millisecond. E.g., if the duration represents -1 nanosecond, it will be rounded to 0.
*/
public static long toMillis(Duration duration) {
checkValid(duration);
return checkedAdd(
checkedMultiply(duration.getSeconds(), MILLIS_PER_SECOND),
duration.getNanos() / NANOS_PER_MILLISECOND);
}
/** Create a Duration from the number of microseconds. */
public static Duration fromMicros(long microseconds) {
return normalizedDuration(
microseconds / MICROS_PER_SECOND,
(int) (microseconds % MICROS_PER_SECOND * NANOS_PER_MICROSECOND));
}
/**
* Convert a Duration to the number of microseconds. The result will be rounded towards 0 to the
* nearest microseconds. E.g., if the duration represents -1 nanosecond, it will be rounded to 0.
*/
public static long toMicros(Duration duration) {
checkValid(duration);
return checkedAdd(
checkedMultiply(duration.getSeconds(), MICROS_PER_SECOND),
duration.getNanos() / NANOS_PER_MICROSECOND);
}
/** Create a Duration from the number of nanoseconds. */
public static Duration fromNanos(long nanoseconds) {
return normalizedDuration(
nanoseconds / NANOS_PER_SECOND, (int) (nanoseconds % NANOS_PER_SECOND));
}
/** Convert a Duration to the number of nanoseconds. */
public static long toNanos(Duration duration) {
checkValid(duration);
return checkedAdd(
checkedMultiply(duration.getSeconds(), NANOS_PER_SECOND), duration.getNanos());
}
/** Add two durations. */
public static Duration add(Duration d1, Duration d2) {
checkValid(d1);
checkValid(d2);
return normalizedDuration(
checkedAdd(d1.getSeconds(), d2.getSeconds()), checkedAdd(d1.getNanos(), d2.getNanos()));
}
/** Subtract a duration from another. */
public static Duration subtract(Duration d1, Duration d2) {
checkValid(d1);
checkValid(d2);
return normalizedDuration(
checkedSubtract(d1.getSeconds(), d2.getSeconds()),
checkedSubtract(d1.getNanos(), d2.getNanos()));
}
static Duration normalizedDuration(long seconds, int nanos) {
if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) {
seconds = checkedAdd(seconds, nanos / NANOS_PER_SECOND);
nanos %= NANOS_PER_SECOND;
}
if (seconds > 0 && nanos < 0) {
nanos += NANOS_PER_SECOND; // no overflow since nanos is negative (and we're adding)
seconds--; // no overflow since seconds is positive (and we're decrementing)
}
if (seconds < 0 && nanos > 0) {
nanos -= NANOS_PER_SECOND; // no overflow since nanos is positive (and we're subtracting)
seconds++; // no overflow since seconds is negative (and we're incrementing)
}
Duration duration = Duration.newBuilder().setSeconds(seconds).setNanos(nanos).build();
return checkValid(duration);
}
}
