Durations.java

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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
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//
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package com.google.protobuf.util;
 
import static com.google.common.base.Preconditions.checkArgument;
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.errorprone.annotations.CanIgnoreReturnValue;
import com.google.protobuf.Duration;
import java.text.ParseException;
import java.util.Comparator;
 
public final class Durations {
  static final long DURATION_SECONDS_MIN = -315576000000L;
  static final long DURATION_SECONDS_MAX = 315576000000L;
 
  private static final long SECONDS_PER_MINUTE = 60L;
  private static final long SECONDS_PER_HOUR = SECONDS_PER_MINUTE * 60;
  private static final long SECONDS_PER_DAY = SECONDS_PER_HOUR * 24;
 
  public static final Duration MIN_VALUE =
      Duration.newBuilder().setSeconds(DURATION_SECONDS_MIN).setNanos(-999999999).build();
 
  public static final Duration MAX_VALUE =
      Duration.newBuilder().setSeconds(DURATION_SECONDS_MAX).setNanos(999999999).build();
 
  public static final Duration ZERO = Duration.newBuilder().setSeconds(0L).setNanos(0).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());
        }
      };
 
  public static Comparator<Duration> comparator() {
    return COMPARATOR;
  }
 
  public static int compare(Duration x, Duration y) {
    return COMPARATOR.compare(x, y);
  }
 
  public static boolean isValid(Duration duration) {
    return isValid(duration.getSeconds(), duration.getNanos());
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  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;
  }
 
  public static boolean isNegative(Duration duration) {
    checkValid(duration);
    return (duration.getSeconds() == 0) ? duration.getNanos() < 0 : duration.getSeconds() < 0;
  }
 
  @CanIgnoreReturnValue
  public static Duration checkNotNegative(Duration duration) {
    checkValid(duration);
    checkArgument(!isNegative(duration), "duration (%s) must not be negative", toString(duration));
    return duration;
  }
 
  @CanIgnoreReturnValue
  public static Duration checkPositive(Duration duration) {
    checkValid(duration);
    checkArgument(
        !isNegative(duration) && !duration.equals(ZERO),
        "duration (%s) must be positive",
        toString(duration));
    return duration;
  }
 
  @CanIgnoreReturnValue
  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;
  }
 
  public static Duration checkValid(Duration.Builder durationBuilder) {
    return checkValid(durationBuilder.build());
  }
 
  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();
  }
 
  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);
    }
  }
 
  // Static factories
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromDays(long days) {
    return Duration.newBuilder()
        .setSeconds(checkedMultiply(days, SECONDS_PER_DAY))
        .setNanos(0)
        .build();
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromHours(long hours) {
    return Duration.newBuilder()
        .setSeconds(checkedMultiply(hours, SECONDS_PER_HOUR))
        .setNanos(0)
        .build();
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromMinutes(long minutes) {
    return Duration.newBuilder()
        .setSeconds(checkedMultiply(minutes, SECONDS_PER_MINUTE))
        .setNanos(0)
        .build();
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromSeconds(long seconds) {
    return normalizedDuration(seconds, 0);
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromMillis(long milliseconds) {
    return normalizedDuration(
        milliseconds / MILLIS_PER_SECOND,
        (int) (milliseconds % MILLIS_PER_SECOND * NANOS_PER_MILLISECOND));
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromMicros(long microseconds) {
    return normalizedDuration(
        microseconds / MICROS_PER_SECOND,
        (int) (microseconds % MICROS_PER_SECOND * NANOS_PER_MICROSECOND));
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static Duration fromNanos(long nanoseconds) {
    return normalizedDuration(
        nanoseconds / NANOS_PER_SECOND, (int) (nanoseconds % NANOS_PER_SECOND));
  }
 
  // Conversion APIs
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toDays(Duration duration) {
    return checkValid(duration).getSeconds() / SECONDS_PER_DAY;
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toHours(Duration duration) {
    return checkValid(duration).getSeconds() / SECONDS_PER_HOUR;
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toMinutes(Duration duration) {
    return checkValid(duration).getSeconds() / SECONDS_PER_MINUTE;
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toSeconds(Duration duration) {
    return checkValid(duration).getSeconds();
  }
 
  @SuppressWarnings({
    "DurationSecondsToDouble", // that's the whole point of this method
    "GoodTime" // this is a legacy conversion API
  })
  public static double toSecondsAsDouble(Duration duration) {
    checkValid(duration);
    return duration.getSeconds() + duration.getNanos() / 1e9;
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toMillis(Duration duration) {
    checkValid(duration);
    return checkedAdd(
        checkedMultiply(duration.getSeconds(), MILLIS_PER_SECOND),
        duration.getNanos() / NANOS_PER_MILLISECOND);
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toMicros(Duration duration) {
    checkValid(duration);
    return checkedAdd(
        checkedMultiply(duration.getSeconds(), MICROS_PER_SECOND),
        duration.getNanos() / NANOS_PER_MICROSECOND);
  }
 
  @SuppressWarnings("GoodTime") // this is a legacy conversion API
  public static long toNanos(Duration duration) {
    checkValid(duration);
    return checkedAdd(
        checkedMultiply(duration.getSeconds(), NANOS_PER_SECOND), duration.getNanos());
  }
 
  // Math operations
 
  public static Duration add(Duration d1, Duration d2) {
    checkValid(d1);
    checkValid(d2);
    return normalizedDuration(
        checkedAdd(d1.getSeconds(), d2.getSeconds()), checkedAdd(d1.getNanos(), d2.getNanos()));
  }
 
  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);
  }
}