definition.HandlerStoryDefinitionCreator.kt Maven / Gradle / Ivy

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/*
 * Copyright (C) 2017/2021 e-voyageurs technologies
 *
 * 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 ai.tock.bot.definition

import ai.tock.bot.engine.BotBus
import kotlin.reflect.full.isSubtypeOf
import kotlin.reflect.full.primaryConstructor
import kotlin.reflect.full.starProjectedType

/**
 * Returns default [HandlerStoryDefinitionCreator].
 */
inline fun  defaultHandlerStoryDefinitionCreator(): HandlerStoryDefinitionCreator =
    T::class.let {
        object : HandlerStoryDefinitionCreator {
            override fun create(bus: BotBus, data: Any?): T {
                val pC = it.primaryConstructor ?: error("No primary constructor for $it")

                return pC.callBy(
                    listOfNotNull(
                        pC.parameters.first { parameter ->
                            bus::class.starProjectedType.isSubtypeOf(parameter.type)
                        } to bus,
                        if (data != null) {
                            pC.parameters.find { parameter ->
                                data::class.starProjectedType.isSubtypeOf(parameter.type)
                            }?.let { p ->
                                p to data
                            }
                        } else {
                            null
                        }
                    ).toMap()
                )
            }
        }
    }

/**
 * In order to create [StoryHandlerDefinition].
 */
interface HandlerStoryDefinitionCreator {

    /**
     * Creates a new [StoryHandlerDefinition].
     */
    fun create(bus: BotBus, data: Any? = null): T
}