SharedPreferences under Delegated properties - PreferencesDelegate setValue.

PreferencesDelegate.kt

open class PreferencesDelegate<T>(private val key: String) {
    private var variable: Any? = null
    private var initialized = false

    /**
     * Saves given value to SharedPreferences on synchronized thread.
     * @param thisRef - is the reference to the class that contains the property
     * @param property - is an instance of the [KProperty] class, which contains metadata.
     */
    open operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
        if (thisRef !is SharedPreferencesProvider)
            throw RuntimeException("Please check if your manager implementation class implement SharedPreferencesProvider interface.")

        synchronized(this) {
            if (variable == value) return

            variable = value
            thisRef.preferences.edit()?.apply {
                value?.takeIf { it != null }?.apply {
                    putAny(key, value)
                } ?: remove(key)
            }?.apply()
        }
    }
}