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This commit is contained in:
Danila Fedorin 2017-09-01 18:32:41 -07:00
parent ce82fd56dd
commit e62722ce2f
3 changed files with 48 additions and 0 deletions
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6
core/src/main/kotlin/org/nwapw/abacus/number/NumberUtils.kt
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@ -5,6 +5,12 @@ typealias PromotionFunction = java.util.function.Function<NumberInterface, Numbe
typealias PromotionPath = List<PromotionFunction>
typealias NumberClass = Class<NumberInterface>
/**
* Promote a number through this path. The functions in this path
* are applied in order to the number, and the final result is returned.
*
* @param from the number to start from.
*/
fun PromotionPath.promote(from: NumberInterface): NumberInterface {
return fold(from, { current, function -> function.apply(current) })
}

36
core/src/main/kotlin/org/nwapw/abacus/number/PromotionManager.kt
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@ -2,12 +2,31 @@ package org.nwapw.abacus.number
import org.nwapw.abacus.Abacus
import org.nwapw.abacus.plugin.NumberImplementation
import org.nwapw.abacus.plugin.PluginListener
import org.nwapw.abacus.plugin.PluginManager
import java.util.function.Function
class PromotionManager(val abacus: Abacus) {
/**
* A class that handles promotions based on priority and the
* transition paths each implementation provides.
*
* @property abacus the Abacus instance to use to access other components.
*/
class PromotionManager(val abacus: Abacus) : PluginListener {
/**
* The already computed paths
*/
val computePaths = mutableMapOf<Pair<NumberImplementation, NumberImplementation>, PromotionPath?>()
/**
* Computes a path between a starting and an ending implementation.
*
* @param from the implementation to start from.
* @param to the implementation to get to.
* @return the resulting promotion path, or null if it is not found
*/
fun computePathBetween(from: NumberImplementation, to: NumberImplementation): PromotionPath? {
val fromName = abacus.pluginManager.interfaceImplementationNameFor(from.implementation)
val toName = abacus.pluginManager.interfaceImplementationNameFor(to.implementation)
@ -19,12 +38,29 @@ class PromotionManager(val abacus: Abacus) {
return null
}
/**
* If a path between the given implementations has already been computed, uses
* the already calculated path. Otherwise, calls [computePathBetween] to compute a new
* path.
*
* @param from the implementation to start from.
* @param to the implementation to get to.
* @return the resulting promotion path, or null if it is not found
*/
fun getPathBetween(from: NumberImplementation, to: NumberImplementation): PromotionPath? {
return computePaths.computeIfAbsent(from to to, {
computePathBetween(it.first, it.second)
})
}
/**
* Promote all the numbers in the list to the same number implementation, to ensure
* they can be used with each other. Finds the highest priority implementation
* in the list, and promotes all other numbers to it.
*
* @param numbers the numbers to promote.
* @return the resulting promotion result.
*/
fun promote(vararg numbers: NumberInterface): PromotionResult? {
val pluginManager = abacus.pluginManager
val implementations = numbers.map { pluginManager.interfaceImplementationFor(it.javaClass) }

6
core/src/main/kotlin/org/nwapw/abacus/number/PromotionResult.kt
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@ -2,4 +2,10 @@ package org.nwapw.abacus.number
import org.nwapw.abacus.plugin.NumberImplementation
/**
* The result of promoting an array of NumberInterfaces.
*
* @param promotedTo the implementation to which the numbers were promoted.
* @param items the items the items resulting from the promotion.
*/
data class PromotionResult(val promotedTo: NumberImplementation, val items: Array<NumberInterface>)