// Protocol Buffers - Google's data interchange format
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// https://developers.google.com/protocol-buffers/
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package com.google.protobuf.util;
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;
/**
* Utilities to help create/manipulate {@code protobuf/duration.proto}.
*/
public final class Durations {
static final long DURATION_SECONDS_MIN = -315576000000L;
static final long DURATION_SECONDS_MAX = 315576000000L;
// TODO(kak): Do we want to expose Duration constants for MAX/MIN?
private Durations() {}
/**
* 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>Note: 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>Note: 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, long 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 seconds/nanos are not
* a valid {@link Duration}.
*/
private static void checkValid(long seconds, int nanos) {
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));
}
}
/**
* 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) {
long seconds = duration.getSeconds();
int nanos = duration.getNanos();
checkValid(seconds, nanos);
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 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) {
return 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) {
return 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) {
return duration.getSeconds() * NANOS_PER_SECOND + duration.getNanos();
}
/**
* Add two durations.
*/
public static Duration add(Duration d1, Duration d2) {
return normalizedDuration(d1.getSeconds() + d2.getSeconds(), d1.getNanos() + d2.getNanos());
}
/**
* Subtract a duration from another.
*/
public static Duration subtract(Duration d1, Duration d2) {
return normalizedDuration(d1.getSeconds() - d2.getSeconds(), d1.getNanos() - d2.getNanos());
}
static Duration normalizedDuration(long seconds, int nanos) {
if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) {
seconds += nanos / NANOS_PER_SECOND;
nanos %= NANOS_PER_SECOND;
}
if (seconds > 0 && nanos < 0) {
nanos += NANOS_PER_SECOND;
seconds -= 1;
}
if (seconds < 0 && nanos > 0) {
nanos -= NANOS_PER_SECOND;
seconds += 1;
}
checkValid(seconds, nanos);
return Duration.newBuilder().setSeconds(seconds).setNanos(nanos).build();
}
}