device/bluetooth/bluetooth_discovery_filter.cc


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "device/bluetooth/bluetooth_discovery_filter.h"

namespace device {

BluetoothDiscoveryFilter::BluetoothDiscoveryFilter(TransportMask transport) {
  SetTransport(transport);
}

BluetoothDiscoveryFilter::~BluetoothDiscoveryFilter() {
}

bool BluetoothDiscoveryFilter::GetRSSI(int16_t* out_rssi) const {
  DCHECK(out_rssi);
  if (!rssi_.get())
    return false;

  *out_rssi = *rssi_;
  return true;
}

void BluetoothDiscoveryFilter::SetRSSI(int16_t rssi) {
  if (!rssi_.get())
    rssi_.reset(new int16_t());

  *rssi_ = rssi;
}

bool BluetoothDiscoveryFilter::GetPathloss(uint16_t* out_pathloss) const {
  DCHECK(out_pathloss);
  if (!pathloss_.get())
    return false;

  *out_pathloss = *pathloss_;
  return true;
}

void BluetoothDiscoveryFilter::SetPathloss(uint16_t pathloss) {
  if (!pathloss_.get())
    pathloss_.reset(new uint16_t());

  *pathloss_ = pathloss;
}

BluetoothDiscoveryFilter::TransportMask BluetoothDiscoveryFilter::GetTransport()
    const {
  return transport_;
}

void BluetoothDiscoveryFilter::SetTransport(TransportMask transport) {
  DCHECK(transport > 0 && transport < 4);
  transport_ = transport;
}

void BluetoothDiscoveryFilter::GetUUIDs(
    std::set<device::BluetoothUUID>& out_uuids) const {
  out_uuids.clear();

  for (auto& uuid : uuids_)
    out_uuids.insert(*uuid);
}

void BluetoothDiscoveryFilter::AddUUID(const device::BluetoothUUID& uuid) {
  DCHECK(uuid.IsValid());
  for (auto& uuid_it : uuids_) {
    if (*uuid_it == uuid)
      return;
  }

  uuids_.push_back(new device::BluetoothUUID(uuid));
}

void BluetoothDiscoveryFilter::CopyFrom(
    const BluetoothDiscoveryFilter& filter) {
  transport_ = filter.transport_;

  if (filter.uuids_.size()) {
    for (auto& uuid : filter.uuids_)
      AddUUID(*uuid);
  } else
    uuids_.clear();

  if (filter.rssi_.get()) {
    SetRSSI(*filter.rssi_);
  } else
    rssi_.reset();

  if (filter.pathloss_.get()) {
    SetPathloss(*filter.pathloss_);
  } else
    pathloss_.reset();
}

scoped_ptr<device::BluetoothDiscoveryFilter> BluetoothDiscoveryFilter::Merge(
    const device::BluetoothDiscoveryFilter* filter_a,
    const device::BluetoothDiscoveryFilter* filter_b) {
  scoped_ptr<BluetoothDiscoveryFilter> result;

  if (!filter_a && !filter_b) {
    return result;
  }

  result.reset(new BluetoothDiscoveryFilter(Transport::TRANSPORT_DUAL));

  if (!filter_a || !filter_b || filter_a->IsDefault() ||
      filter_b->IsDefault()) {
    return result;
  }

  // both filters are not empty, so they must have transport set.
  result->SetTransport(filter_a->transport_ | filter_b->transport_);

  // if both filters have uuids, them merge them. Otherwise uuids filter should
  // be left empty
  if (filter_a->uuids_.size() && filter_b->uuids_.size()) {
    std::set<device::BluetoothUUID> uuids;
    filter_a->GetUUIDs(uuids);
    for (auto& uuid : uuids)
      result->AddUUID(uuid);

    filter_b->GetUUIDs(uuids);
    for (auto& uuid : uuids)
      result->AddUUID(uuid);
  }

  if ((filter_a->rssi_.get() && filter_b->pathloss_.get()) ||
      (filter_a->pathloss_.get() && filter_b->rssi_.get())) {
    // if both rssi and pathloss filtering is enabled in two different
    // filters, we can't tell which filter is more generic, and we don't set
    // proximity filtering on merged filter.
    return result;
  }

  if (filter_a->rssi_.get() && filter_b->rssi_.get()) {
    result->SetRSSI(std::min(*filter_a->rssi_, *filter_b->rssi_));
  } else if (filter_a->pathloss_.get() && filter_b->pathloss_.get()) {
    result->SetPathloss(std::max(*filter_a->pathloss_, *filter_b->pathloss_));
  }

  return result;
}

bool BluetoothDiscoveryFilter::Equals(
    const BluetoothDiscoveryFilter& other) const {
  if (((!!rssi_.get()) != (!!other.rssi_.get())) ||
      (rssi_.get() && other.rssi_.get() && *rssi_ != *other.rssi_)) {
    return false;
  }

  if (((!!pathloss_.get()) != (!!other.pathloss_.get())) ||
      (pathloss_.get() && other.pathloss_.get() &&
       *pathloss_ != *other.pathloss_)) {
    return false;
  }

  if (transport_ != other.transport_)
    return false;

  std::set<device::BluetoothUUID> uuids_a, uuids_b;
  GetUUIDs(uuids_a);
  other.GetUUIDs(uuids_b);
  if (uuids_a != uuids_b)
    return false;

  return true;
}

bool BluetoothDiscoveryFilter::IsDefault() const {
  return !(rssi_.get() || pathloss_.get() || uuids_.size() ||
           transport_ != Transport::TRANSPORT_DUAL);
}

}  // namespace device