getItem method

@override V? getItem({ K? remote, K? local, })

Get value by key pair (remote, local)

@param remote - remote address @param local - local address @return mapped value

Implementation

@override
V? getItem({K? remote, K? local}) {
  K? key1, key2;
  if (remote == null) {
    assert(local != null, 'local & remote addresses should not empty at the same time');
    key1 = local;
    key2 = null;
  } else {
    key1 = remote;
    key2 = local;
  }
  Map<K, V>? table = _map[key1];
  if (table == null) {
    return null;
  }
  V? value;
  if (key2 != null) {
    // mapping: (remote, local) => Connection
    value = table[key2];
    if (value != null) {
      return value;
    }
    // take any Connection connected to remote
    return table[_defaultKey];
  }
  // mapping: (remote, null) => Connection
  // mapping: (local, null) => Connection
  value = table[_defaultKey];
  if (value != null) {
    // take the value with empty key2
    return value;
  }
  // take any Connection connected to remote / bound to local
  for (V? v in table.values) {
    if (v != null) {
      return v;
    }
  }
  return null;
}