Power.kt
/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.health.connect.client.units
/**
* Represents a unit of power. Supported units:
* - watts - see [Power.watts], [Double.watts]
* - kilocalories/day - see [Power.kilocaloriesPerDay], [Double.kilocaloriesPerDay]
*/
class Power
private constructor(
private val value: Double,
private val type: Type,
) : Comparable<Power> {
/** Returns the power in Watts. */
@get:JvmName("getWatts")
val inWatts: Double
get() = value * type.wattsPerUnit
/** Returns the power in kilocalories/day. */
@get:JvmName("getKilocaloriesPerDay")
val inKilocaloriesPerDay: Double
get() = get(type = Type.KILOCALORIES_PER_DAY)
private fun get(type: Type): Double =
if (this.type == type) value else inWatts / type.wattsPerUnit
/** Returns zero [Power] of the same [Type]. */
internal fun zero(): Power = ZEROS.getValue(type)
override fun compareTo(other: Power): Int =
if (type == other.type) {
value.compareTo(other.value)
} else {
inWatts.compareTo(other.inWatts)
}
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (other !is Power) return false
if (type == other.type) {
return value == other.value
}
return inWatts == other.inWatts
}
override fun hashCode(): Int = inWatts.hashCode()
override fun toString(): String = "$value ${type.title}"
companion object {
private val ZEROS = Type.values().associateWith { Power(value = 0.0, type = it) }
/** Creates [Power] with the specified value in Watts. */
@JvmStatic fun watts(value: Double): Power = Power(value, Type.WATTS)
/** Creates [Power] with the specified value in kilocalories/day. */
@JvmStatic
fun kilocaloriesPerDay(value: Double): Power = Power(value, Type.KILOCALORIES_PER_DAY)
}
private enum class Type {
WATTS {
override val wattsPerUnit: Double = 1.0
override val title: String = "Watts"
},
KILOCALORIES_PER_DAY {
override val wattsPerUnit: Double = 0.0484259259
override val title: String = "kcal/day"
};
abstract val wattsPerUnit: Double
abstract val title: String
}
}
/** Creates [Power] with the specified value in Watts. */
@get:JvmSynthetic
val Double.watts: Power
get() = Power.watts(value = this)
/** Creates [Power] with the specified value in Watts. */
@get:JvmSynthetic
val Long.watts: Power
get() = toDouble().watts
/** Creates [Power] with the specified value in Watts. */
@get:JvmSynthetic
val Float.watts: Power
get() = toDouble().watts
/** Creates [Power] with the specified value in Watts. */
@get:JvmSynthetic
val Int.watts: Power
get() = toDouble().watts
/** Creates [Power] with the specified value in kilocalories/day. */
@get:JvmSynthetic
val Double.kilocaloriesPerDay: Power
get() = Power.kilocaloriesPerDay(value = this)
/** Creates [Power] with the specified value in kilocalories/day. */
@get:JvmSynthetic
val Long.kilocaloriesPerDay: Power
get() = toDouble().kilocaloriesPerDay
/** Creates [Power] with the specified value in kilocalories/day. */
@get:JvmSynthetic
val Float.kilocaloriesPerDay: Power
get() = toDouble().kilocaloriesPerDay
/** Creates [Power] with the specified value in kilocalories/day. */
@get:JvmSynthetic
val Int.kilocaloriesPerDay: Power
get() = toDouble().kilocaloriesPerDay