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90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "core/options.h"
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#include <string>
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namespace location {
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namespace nearby {
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namespace connections {
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// Verify if ConnectionOptions is in a not-initialized (Empty) state.
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bool ConnectionOptions::Empty() const { return strategy.IsNone(); }
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// Bring ConnectionOptions to a not-initialized (Empty) state.
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void ConnectionOptions::Clear() { strategy.Clear(); }
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// Returns a copy and normalizes allowed mediums:
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// (1) If is_out_of_band_connection is true, verifies that there is only one
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// medium allowed, defaulting to only Bluetooth if unspecified.
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// (2) If no mediums are allowed, allow all mediums.
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ConnectionOptions ConnectionOptions::CompatibleOptions() const {
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ConnectionOptions result = *this;
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// Out-of-band connections initiate connections via an injected endpoint
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// rather than through the normal discovery flow. These types of connections
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// can only be injected via a single medium.
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if (is_out_of_band_connection) {
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int num_enabled = result.allowed.Count(true);
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// Default to allow only Bluetooth if no single medium is specified.
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if (num_enabled != 1) {
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result.allowed.SetAll(false);
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result.allowed.bluetooth = true;
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}
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return result;
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}
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// Normal connections (i.e., not out-of-band) connections can specify
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// multiple mediums. If none are specified, default to allowing all mediums.
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if (!allowed.Any(true)) result.allowed.SetAll(true);
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return result;
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}
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std::vector<Medium> ConnectionOptions::GetMediums() const {
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return allowed.GetMediums(true);
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}
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// This call follows the standard Microsoft calling pattern of calling first
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// to get the size of the array. Caller then allocates memory for the array,
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// and makes this call again to copy the array into the provided location.
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void ConnectionOptions::GetMediums(
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location::nearby::proto::connections::Medium* mediums,
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uint32_t* mediumsSize) {
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auto size = GetMediums().size();
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// Caller is seeking the size of mediums
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if (mediums == nullptr) {
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*mediumsSize = size;
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return;
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}
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// Caller has not specified enough memory
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if (*mediumsSize < size) {
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mediums = nullptr; // ensure nullptr return
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*mediumsSize = size; // update the size to indicate the correct size
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return;
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}
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for (uint32_t i = 0; i < size; i++) {
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// Construct an array at the given location
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mediums[i] = GetMediums().at(i);
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}
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}
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} // namespace connections
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} // namespace nearby
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} // namespace location
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