1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef DEVICE_NFC_NFC_TAG_TECHNOLOGY_CHROMEOS_H_
6#define DEVICE_NFC_NFC_TAG_TECHNOLOGY_CHROMEOS_H_
7
8#include <map>
9
10#include "base/memory/weak_ptr.h"
11#include "base/observer_list.h"
12#include "chromeos/dbus/nfc_record_client.h"
13#include "device/nfc/nfc_tag_technology.h"
14
15namespace chromeos {
16
17class NfcTagChromeOS;
18
19// The NfcNdefTagTechnologyChromeOS class implements
20// device::NfcNdefTagTechnology for the Chrome OS platform. The lifetime of an
21// instance of this class must be tied to an instance of NfcTagChromeOS.
22// Instances of this class must never outlast the owning NfcTagChromeOS
23// instance.
24class NfcNdefTagTechnologyChromeOS : public device::NfcNdefTagTechnology,
25                                     public NfcRecordClient::Observer {
26 public:
27  virtual ~NfcNdefTagTechnologyChromeOS();
28
29  // device::NfcNdefTagTechnology overrides.
30  virtual void AddObserver(device::NfcNdefTagTechnology::Observer* observer)
31    OVERRIDE;
32  virtual void RemoveObserver(device::NfcNdefTagTechnology::Observer* observer)
33    OVERRIDE;
34  virtual const device::NfcNdefMessage& GetNdefMessage() const OVERRIDE;
35  virtual void WriteNdef(const device::NfcNdefMessage& message,
36                         const base::Closure& callback,
37                         const ErrorCallback& error_callback) OVERRIDE;
38
39  // NfcRecordClient::Observer overrides.
40  virtual void RecordAdded(const dbus::ObjectPath& object_path) OVERRIDE;
41  virtual void RecordRemoved(const dbus::ObjectPath& object_path) OVERRIDE;
42  virtual void RecordPropertiesReceived(
43      const dbus::ObjectPath& object_path) OVERRIDE;
44
45 private:
46  friend class NfcTagChromeOS;
47
48  // Mapping from D-Bus object paths to NfcNdefRecord objects.
49  typedef std::map<dbus::ObjectPath, device::NfcNdefRecord*> NdefRecordMap;
50
51  explicit NfcNdefTagTechnologyChromeOS(NfcTagChromeOS* tag);
52
53  // Called by dbus:: on completion of the D-Bus method call to write an NDEF.
54  void OnWriteNdefMessage(const base::Closure& callback);
55  void OnWriteNdefMessageError(const ErrorCallback& error_callback,
56                               const std::string& error_name,
57                               const std::string& error_message);
58
59  // Creates a record object for the record with object path |object_path| and
60  // notifies the observers, if a record object did not already exist for it.
61  void AddRecord(const dbus::ObjectPath& object_path);
62
63  // A map containing the NDEF records that were received from the tag.
64  NdefRecordMap records_;
65
66  // Message instance that contains pointers to all created records that are
67  // in |records_|. This is mainly used as the cached return value for
68  // GetNdefMessage().
69  device::NfcNdefMessage message_;
70
71  // List of observers interested in event notifications from us.
72  ObserverList<device::NfcNdefTagTechnology::Observer> observers_;
73
74  // D-Bus object path of the remote tag or device that this object operates
75  // on.
76  dbus::ObjectPath object_path_;
77
78  // Note: This should remain the last member so it'll be destroyed and
79  // invalidate its weak pointers before any other members are destroyed.
80  base::WeakPtrFactory<NfcNdefTagTechnologyChromeOS> weak_ptr_factory_;
81
82  DISALLOW_COPY_AND_ASSIGN(NfcNdefTagTechnologyChromeOS);
83};
84
85}  // namespace chromeos
86
87#endif  // DEVICE_NFC_NFC_TAG_TECHNOLOGY_CHROMEOS_H_
88