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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
// Copyright 2013 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 "chromeos/dbus/nfc_tag_client.h"
#include <set>
#include "base/bind.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/strings/stringprintf.h"
#include "chromeos/dbus/fake_nfc_tag_client.h"
#include "chromeos/dbus/nfc_adapter_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
using chromeos::nfc_client_helpers::DBusObjectMap;
namespace chromeos {
NfcTagClient::Properties::Properties(
dbus::ObjectProxy* object_proxy,
const PropertyChangedCallback& callback)
: NfcPropertySet(object_proxy,
nfc_tag::kNfcTagInterface,
callback) {
RegisterProperty(nfc_tag::kTypeProperty, &type);
RegisterProperty(nfc_tag::kProtocolProperty, &protocol);
RegisterProperty(nfc_tag::kRecordsProperty, &records);
RegisterProperty(nfc_tag::kReadOnlyProperty, &read_only);
}
NfcTagClient::Properties::~Properties() {
}
// The NfcTagClient implementation used in production.
class NfcTagClientImpl : public NfcTagClient,
public NfcAdapterClient::Observer,
public nfc_client_helpers::DBusObjectMap::Delegate {
public:
explicit NfcTagClientImpl(NfcAdapterClient* adapter_client)
: bus_(NULL),
adapter_client_(adapter_client),
weak_ptr_factory_(this) {
DCHECK(adapter_client);
}
virtual ~NfcTagClientImpl() {
adapter_client_->RemoveObserver(this);
}
// NfcTagClient override.
virtual void AddObserver(NfcTagClient::Observer* observer) OVERRIDE {
DCHECK(observer);
observers_.AddObserver(observer);
}
// NfcTagClient override.
virtual void RemoveObserver(NfcTagClient::Observer* observer) OVERRIDE {
DCHECK(observer);
observers_.RemoveObserver(observer);
}
// NfcTagClient override.
virtual Properties* GetProperties(const dbus::ObjectPath& object_path)
OVERRIDE {
return static_cast<Properties*>(
object_map_->GetObjectProperties(object_path));
}
// NfcTagClient override.
virtual void Write(
const dbus::ObjectPath& object_path,
const RecordAttributes& attributes,
const base::Closure& callback,
const nfc_client_helpers::ErrorCallback& error_callback) OVERRIDE {
dbus::ObjectProxy* object_proxy = object_map_->GetObjectProxy(object_path);
if (!object_proxy) {
std::string error_message =
base::StringPrintf("NFC tag with object path \"%s\" does not exist.",
object_path.value().c_str());
LOG(ERROR) << error_message;
error_callback.Run(nfc_client_helpers::kUnknownObjectError,
error_message);
return;
}
// |attributes| should not be empty.
if (attributes.empty()) {
std::string error_message =
"Cannot write data to tag with empty arguments.";
LOG(ERROR) << error_message;
error_callback.Run(nfc_error::kInvalidArguments, error_message);
return;
}
// Create the arguments.
dbus::MethodCall method_call(nfc_tag::kNfcTagInterface, nfc_tag::kWrite);
dbus::MessageWriter writer(&method_call);
dbus::MessageWriter array_writer(NULL);
dbus::MessageWriter dict_entry_writer(NULL);
writer.OpenArray("{sv}", &array_writer);
for (RecordAttributes::const_iterator iter = attributes.begin();
iter != attributes.end(); ++iter) {
array_writer.OpenDictEntry(&dict_entry_writer);
dict_entry_writer.AppendString(iter->first);
dict_entry_writer.AppendVariantOfString(iter->second);
array_writer.CloseContainer(&dict_entry_writer);
}
writer.CloseContainer(&array_writer);
object_proxy->CallMethodWithErrorCallback(
&method_call,
dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&nfc_client_helpers::OnSuccess, callback),
base::Bind(&nfc_client_helpers::OnError, error_callback));
}
protected:
// DBusClient override.
virtual void Init(dbus::Bus* bus) OVERRIDE {
VLOG(1) << "Creating NfcTagClientImpl";
DCHECK(bus);
bus_ = bus;
object_map_.reset(new nfc_client_helpers::DBusObjectMap(
nfc_tag::kNfcTagServiceName, this, bus));
DCHECK(adapter_client_);
adapter_client_->AddObserver(this);
}
private:
// NfcAdapterClient::Observer override.
virtual void AdapterPropertyChanged(
const dbus::ObjectPath& object_path,
const std::string& property_name) OVERRIDE {
// Update the tag proxies.
DCHECK(adapter_client_);
NfcAdapterClient::Properties *adapter_properties =
adapter_client_->GetProperties(object_path);
// Ignore changes to properties other than "Tags".
if (property_name != adapter_properties->tags.name())
return;
VLOG(1) << "NFC tags changed.";
// Update the known tags.
const std::vector<dbus::ObjectPath>& received_tags =
adapter_properties->tags.value();
object_map_->UpdateObjects(received_tags);
}
// nfc_client_helpers::DBusObjectMap::Delegate override.
virtual NfcPropertySet* CreateProperties(
dbus::ObjectProxy* object_proxy) OVERRIDE {
return new Properties(
object_proxy,
base::Bind(&NfcTagClientImpl::OnPropertyChanged,
weak_ptr_factory_.GetWeakPtr(),
object_proxy->object_path()));
}
// nfc_client_helpers::DBusObjectMap::Delegate override.
virtual void ObjectAdded(const dbus::ObjectPath& object_path) OVERRIDE {
FOR_EACH_OBSERVER(NfcTagClient::Observer, observers_,
TagFound(object_path));
}
virtual void ObjectRemoved(const dbus::ObjectPath& object_path) OVERRIDE {
FOR_EACH_OBSERVER(NfcTagClient::Observer, observers_,
TagLost(object_path));
}
// Called by NfcPropertySet when a property value is changed, either by
// result of a signal or response to a GetAll() or Get() call.
void OnPropertyChanged(const dbus::ObjectPath& object_path,
const std::string& property_name) {
VLOG(1) << "Tag property changed; Path: " << object_path.value()
<< " Property: " << property_name;
FOR_EACH_OBSERVER(NfcTagClient::Observer, observers_,
TagPropertyChanged(object_path, property_name));
}
// We maintain a pointer to the bus to be able to request proxies for
// new NFC tags that appear.
dbus::Bus* bus_;
// Mapping from object paths to object proxies and properties structures that
// were already created by us.
scoped_ptr<nfc_client_helpers::DBusObjectMap> object_map_;
// The manager client that we listen to events notifications from.
NfcAdapterClient* adapter_client_;
// List of observers interested in event notifications.
ObserverList<NfcTagClient::Observer> observers_;
// Weak pointer factory for generating 'this' pointers that might live longer
// than we do.
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<NfcTagClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(NfcTagClientImpl);
};
NfcTagClient::NfcTagClient() {
}
NfcTagClient::~NfcTagClient() {
}
NfcTagClient* NfcTagClient::Create(DBusClientImplementationType type,
NfcAdapterClient* adapter_client) {
if (type == REAL_DBUS_CLIENT_IMPLEMENTATION)
return new NfcTagClientImpl(adapter_client);
DCHECK_EQ(STUB_DBUS_CLIENT_IMPLEMENTATION, type);
return new FakeNfcTagClient();
}
} // namespace chromeos
|