PetkevichPavel

class RemoteConfigFunctions(private val gson: Gson, private val context: Context,
                            private val app: App?,
                            private val remoteConfigManager: RemoteConfigManager) {

    companion object {
        private const val TAG = "RemoteConfigFunctions:"
        private const val RECEIVER_TAG = "FCM Receiver:"
    }

/**

PetkevichPavel

/**
 * Context extension function which will save the file into the device local storage.
 * @param data - content of the file.
 * @param fileName - name of the final file.
 */
fun Context.saveFile(data: ByteArray, fileName: String) =
        openFileOutput(fileName, Context.MODE_PRIVATE)?.apply {
            write(data)
            close()
        }

PetkevichPavel

fetchAndActivate().addOnCompleteListener { task ->
    task.isSuccessful.takeIf { it }?.apply {
      context.saveFile(getString(RemoteConfigConstants.RC_JSON_PARAM_NAME).toByteArray(),
      LOCAL_RC_JSON)
    }
}

PetkevichPavel

fun Context.setDefaultRCFromFile() : Boolean =
    File(filesDir, LOCAL_RC_JSON).takeIf { it.exists() }?.let {file->
        val defaultRC = mutableMapOf<String, Any>()
        gson.fromJson(file.inputStream().convertLocalJsonToString(), RCModel::class.java)?.let { rcModel ->
            defaultRC[RemoteConfigConstants.RC_JSON_PARAM_NAME] = file.inputStream().convertLocalJsonToString()
            remoteConfigManager.updateRc(rcModel)
            remoteConfigManager.updateFetchState(true, currentDateTimestamp)
        }
        app?.firebaseRemoteConfig?.setDefaults(defaultRC)
        file.inputStream().close()

PetkevichPavel

interface SharedPreferencesProvider {
    val preferences: SharedPreferences
}

PetkevichPavel

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

    /**
     * Performing operation 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.
     * @return T - desired value by a given key or null.
     */
    open operator fun getValue(thisRef: Any?, property: KProperty<*>): T? {

PetkevichPavel

//SomeManager.kt
interface SomeManager {
    var userId: Long?
    var userName: String?

    /**
     * Returns true if user valid.
     */
    fun isUserValid(): Boolean

PetkevichPavel

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

    /**
     * Return desired value by a given key. Performing operation 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.
     * @return T - T or null.

PetkevichPavel

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) {

PetkevichPavel

/**
 * SharedPreferences.Editor extension function for putting [value] as Any into Shared preferences.
 * @param key - key for the value.
 * @param value - value as Any.
 */
@Suppress("UNCHECKED_CAST")
fun SharedPreferences.Editor.putAny(key: String, value: Any) {
    when {
        Generic<String>().checkType(value) -> (value as? String)?.let { putString(key, it) }
        Generic<Boolean>().checkType(value) -> (value as? Boolean)?.let { putBoolean(key, it) }