class CallerIDProvider : ContentProvider() {
  private val uriMatcher = UriMatcher(UriMatcher.NO_MATCH)
  override fun onCreate(): Boolean {
    context?.let {
      val authority = it.getString(R.string.callerid_authority)
      uriMatcher.addURI(authority, "directories", DIRECTORIES)
    }
    return true
  }
  override fun query(uri: Uri, projection: Array<out String>?, selection: String?, selectionArgs: Array<out String>?, sortOrder: String?): Cursor? {
    when (uriMatcher.match(uri)) {
        DIRECTORIES -> { /* TODO */ }
    }
    return null
  }

  override fun getType(uri: Uri): String? {
    return null
  }

  override fun delete(uri: Uri, selection: String?, selectionArgs: Array<String>?): Int {
    throw UnsupportedOperationException()
  }

  override fun insert(uri: Uri, values: ContentValues?): Uri? {
    throw UnsupportedOperationException()
  }

  override fun update(uri: Uri, values: ContentValues?, selection: String?, selectionArgs: Array<String>?): Int {
    throw UnsupportedOperationException()
  }

  companion object {
    private const val DIRECTORIES = 1
  }
}