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inline fun SharedPreferences.edit(operation: (SharedPreferences.Editor) -> Unit) {
    val editor = this.edit()
    operation(editor)
    editor.apply()
}

open class PreferenceRepository(val gson: Gson, val sharedPreferences: SharedPreferences) {

    operator inline fun <reified T> get(key: DefaultKey<T>, defaultValue: T? = null): T? {
        val value = sharedPreferences.getString(key.key, "")

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sealed class DefaultKey<T>(val key:String)
object AccessTokenKey : DefaultKey<AccessToken>("access-token")

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data class AccessToken(val token: String)

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public class PreferencesHelperImpl implements PreferencesHelper {
  
  private final Gson gson;
  private final SharedPreferences preferences;

  public PreferencesHelperImpl(Gson gson, SharedPreferences sharedPreferences) {
    this.gson = gson;
    this.preferences = sharedPreferences;
  }
  

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public class AccessToken {
  private final String token;
  public AccessToken(String token) {
    this.token = token;
  }
}

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public class AccessToken {
  private final String token;
  public AccessToken(String token) {
    this.token = token;
  }
}