text: // Copyright 2021 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     https://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #include "connections/discovery_options.h"
  
  #include <string>
  
  namespace location {
  namespace nearby {
  namespace connections {
  
  // Returns a copy and normalizes allowed mediums:
  // (1) If is_out_of_band_connection is true, verifies that there is only one
  //     medium allowed, defaulting to only Bluetooth if unspecified.
  // (2) If no mediums are allowed, allow all mediums.
  DiscoveryOptions DiscoveryOptions::CompatibleOptions() const {
    DiscoveryOptions result = *this;
  
    // Out-of-band connections initiate connections via an injected endpoint
    // rather than through the normal discovery flow. These types of connections
    // can only be injected via a single medium.
    if (is_out_of_band_connection) {
      int num_enabled = result.allowed.Count(true);
  
      // Default to allow only Bluetooth if no single medium is specified.
      if (num_enabled != 1) {
        result.allowed.SetAll(false);
        result.allowed.bluetooth = true;
      }
      return result;
    }
  
    // Normal connections (i.e., not out-of-band) connections can specify
    // multiple mediums. If none are specified, default to allowing all mediums.
    if (!allowed.Any(true)) result.allowed.SetAll(true);
    return result;
  }
  
  }  // namespace connections
  }  // namespace nearby
  }  // namespace location
  