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DurationInstances.scala
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DurationInstances.scala
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/*
* Copyright (c) 2015 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package cats.kernel
package instances
import scala.concurrent.duration.Duration
trait DurationInstances {
implicit val catsKernelStdOrderForDuration
: Order[Duration] with Hash[Duration] with LowerBounded[Duration] with UpperBounded[Duration] = new DurationOrder
implicit val catsKernelStdGroupForDuration: CommutativeGroup[Duration] = new DurationGroup
}
// Duration.Undefined, Duration.Inf, Duration.MinusInf
trait DurationBounded extends LowerBounded[Duration] with UpperBounded[Duration] {
override def minBound: Duration = Duration.MinusInf
override def maxBound: Duration = Duration.Inf
}
/**
* This ordering is valid for all defined durations.
*
* The value Duration.Undefined breaks our laws, because undefined
* values are not equal to themselves.
*/
class DurationOrder extends Order[Duration] with Hash[Duration] with DurationBounded { self =>
def hash(x: Duration): Int = x.hashCode()
def compare(x: Duration, y: Duration): Int = x.compare(y)
override def eqv(x: Duration, y: Duration): Boolean = x == y
override def neqv(x: Duration, y: Duration): Boolean = x != y
override def gt(x: Duration, y: Duration): Boolean = x > y
override def gteqv(x: Duration, y: Duration): Boolean = x >= y
override def lt(x: Duration, y: Duration): Boolean = x < y
override def lteqv(x: Duration, y: Duration): Boolean = x <= y
override def min(x: Duration, y: Duration): Duration = x.min(y)
override def max(x: Duration, y: Duration): Duration = x.max(y)
override val partialOrder: PartialOrder[Duration] = self
}
/**
* This group models addition, but has a few problematic edge cases.
*
* 1. finite values can overflow, throwing an exception
* 2. inf + (-inf) = undefined, not zero
* 3. undefined + zero = undefined
*/
class DurationGroup extends CommutativeGroup[Duration] {
def empty: Duration = Duration.Zero
def inverse(x: Duration): Duration = -x
def combine(x: Duration, y: Duration): Duration = x + y
override def remove(x: Duration, y: Duration): Duration = x - y
}