p-sim-ecu.doip-sim-ecu-dsl.0.9.5.source-code.DataStorage.kt Maven / Gradle / Ivy

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This is a kotlin based domain specific language (dsl), to quickly and intuitively write custom DoIP ECU simulations.

There is a newer version: 0.15.1

import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty

class StoragePropertyDelegate(
    private val storage: MutableMap,
    private val initialValue: () -> T) : ReadWriteProperty {

    override operator fun getValue(thisRef: Nothing?, property: KProperty<*>): T {
        if (!storage.containsKey(property.name)) {
            storage[property.name] = initialValue.invoke()
        }
        @Suppress("UNCHECKED_CAST")
        return storage[property.name] as T
    }

    override operator fun setValue(thisRef: Nothing?, property: KProperty<*>, value: T) {
        storage[property.name] = value
    }
}

open class DataStorage {
    private val internalDataStorage: MutableMap = mutableMapOf()

    /**
     * Create a persistent property by means of delegation, with an initival value
     * calculated by initialValue
     */
    fun  storedProperty(initialValue: () -> T): StoragePropertyDelegate =
        StoragePropertyDelegate(this.internalDataStorage, initialValue)

    /**
     * Clear all stored properties
     */
    fun clearStoredProperties() =
        internalDataStorage.clear()
}