device/nfc/nfc_adapter_chromeos.cc - chromium/src - Git at Google

 // 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 "device/nfc/nfc_adapter_chromeos.h"

 #include <vector>

 #include "base/callback.h"
 #include "base/logging.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "device/nfc/nfc_peer_chromeos.h"
 #include "device/nfc/nfc_tag_chromeos.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"

 namespace chromeos {

 namespace {

 typedef std::vector<dbus::ObjectPath> ObjectPathVector;

 }  // namespace

 NfcAdapterChromeOS::NfcAdapterChromeOS()
     : weak_ptr_factory_(this) {
   DBusThreadManager::Get()->GetNfcAdapterClient()->AddObserver(this);
   DBusThreadManager::Get()->GetNfcDeviceClient()->AddObserver(this);
   DBusThreadManager::Get()->GetNfcTagClient()->AddObserver(this);

   const ObjectPathVector& object_paths =
       DBusThreadManager::Get()->GetNfcAdapterClient()->GetAdapters();
   if (!object_paths.empty()) {
     VLOG(1) << object_paths.size() << " NFC adapter(s) available.";
     SetAdapter(object_paths[0]);
   }
 }

 NfcAdapterChromeOS::~NfcAdapterChromeOS() {
   DBusThreadManager::Get()->GetNfcAdapterClient()->RemoveObserver(this);
   DBusThreadManager::Get()->GetNfcDeviceClient()->RemoveObserver(this);
   DBusThreadManager::Get()->GetNfcTagClient()->RemoveObserver(this);
 }

 void NfcAdapterChromeOS::AddObserver(NfcAdapter::Observer* observer) {
   DCHECK(observer);
   observers_.AddObserver(observer);
 }

 void NfcAdapterChromeOS::RemoveObserver(NfcAdapter::Observer* observer) {
   DCHECK(observer);
   observers_.RemoveObserver(observer);
 }

 bool NfcAdapterChromeOS::IsPresent() const {
   return !object_path_.value().empty();
 }

 bool NfcAdapterChromeOS::IsPowered() const {
   if (!IsPresent())
     return false;
   return DBusThreadManager::Get()->GetNfcAdapterClient()->
       GetProperties(object_path_)->powered.value();
 }

 bool NfcAdapterChromeOS::IsPolling() const {
   if (!IsPresent())
     return false;
   return DBusThreadManager::Get()->GetNfcAdapterClient()->
       GetProperties(object_path_)->polling.value();
 }

 bool NfcAdapterChromeOS::IsInitialized() const {
   return true;
 }

 void NfcAdapterChromeOS::SetPowered(bool powered,
                                     const base::Closure& callback,
                                     const ErrorCallback& error_callback) {
   if (!IsPresent()) {
     LOG(WARNING) << "Adapter not present. Cannot power up the antenna.";
     error_callback.Run();
     return;
   }
   DBusThreadManager::Get()->GetNfcAdapterClient()->
       GetProperties(object_path_)->powered.Set(
           powered,
           base::Bind(&NfcAdapterChromeOS::OnSetPowered,
                      weak_ptr_factory_.GetWeakPtr(),
                      callback,
                      error_callback));
 }

 void NfcAdapterChromeOS::StartPolling(const base::Closure& callback,
                                       const ErrorCallback& error_callback) {
   // Always poll in "Initiator" mode.
   DBusThreadManager::Get()->GetNfcAdapterClient()->
       StartPollLoop(object_path_,
                     nfc_adapter::kModeInitiator,
                     base::Bind(&NfcAdapterChromeOS::OnStartPolling,
                                weak_ptr_factory_.GetWeakPtr(),
                                callback),
                     base::Bind(&NfcAdapterChromeOS::OnStartPollingError,
                                weak_ptr_factory_.GetWeakPtr(),
                                error_callback));
 }

 void NfcAdapterChromeOS::StopPolling(const base::Closure& callback,
                                      const ErrorCallback& error_callback) {
   DBusThreadManager::Get()->GetNfcAdapterClient()->
       StopPollLoop(object_path_,
                    base::Bind(&NfcAdapterChromeOS::OnStopPolling,
                               weak_ptr_factory_.GetWeakPtr(),
                               callback),
                    base::Bind(&NfcAdapterChromeOS::OnStopPollingError,
                               weak_ptr_factory_.GetWeakPtr(),
                               error_callback));
 }

 void NfcAdapterChromeOS::AdapterAdded(const dbus::ObjectPath& object_path) {
   // Set the adapter to the newly added adapter only if no adapter is present.
   if (!IsPresent())
     SetAdapter(object_path);
 }

 void NfcAdapterChromeOS::AdapterRemoved(const dbus::ObjectPath& object_path) {
   if (object_path != object_path_)
     return;

   // The current adapter was removed, so mark us as not present and clean up
   // peers and tags.
   RemoveAdapter();

   // There may still be other adapters present on the system. Set the next
   // available adapter as the current one.
   const ObjectPathVector& object_paths =
       DBusThreadManager::Get()->GetNfcAdapterClient()->GetAdapters();
   for (ObjectPathVector::const_iterator iter =
           object_paths.begin();
        iter != object_paths.end(); ++iter) {
     // The removed object will still be available until the call to
     // AdapterRemoved returns. Make sure that we are not re-adding the
     // removed adapter.
     if (*iter == object_path)
       continue;
     SetAdapter(*iter);
   }
 }

 void NfcAdapterChromeOS::AdapterPropertyChanged(
     const dbus::ObjectPath& object_path,
     const std::string& property_name) {
   if (object_path != object_path_)
     return;
   NfcAdapterClient::Properties* properties =
       DBusThreadManager::Get()->GetNfcAdapterClient()->
           GetProperties(object_path_);
   if (property_name == properties->powered.name())
     PoweredChanged(properties->powered.value());
   else if (property_name == properties->polling.name())
     PollingChanged(properties->polling.value());
 }

 void NfcAdapterChromeOS::DeviceAdded(const dbus::ObjectPath& object_path) {
   if (!IsPresent())
     return;

   if (GetPeer(object_path.value()))
     return;

   VLOG(1) << "NFC device found: " << object_path.value();

   // Check to see if the device belongs to this adapter.
   const ObjectPathVector& devices =
       DBusThreadManager::Get()->GetNfcDeviceClient()->
           GetDevicesForAdapter(object_path_);
   bool device_found = false;
   for (ObjectPathVector::const_iterator iter = devices.begin();
        iter != devices.end(); ++iter) {
     if (*iter == object_path) {
       device_found = true;
       break;
     }
   }
   if (!device_found) {
     VLOG(1) << "Found peer device does not belong to the current adapter.";
     return;
   }

   // Create the peer object.
   NfcPeerChromeOS* peer_chromeos = new NfcPeerChromeOS(object_path);
   SetPeer(object_path.value(), peer_chromeos);
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                     PeerFound(this, peer_chromeos));
 }

 void NfcAdapterChromeOS::DeviceRemoved(const dbus::ObjectPath& object_path) {
   VLOG(1) << "NFC device lost: " << object_path.value();
   device::NfcPeer* peer = RemovePeer(object_path.value());
   if (!peer) {
     VLOG(1) << "Removed peer device does not belong to the current adapter.";
     return;
   }
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_, PeerLost(this, peer));
   delete peer;
 }

 void NfcAdapterChromeOS::TagAdded(const dbus::ObjectPath& object_path) {
   if (!IsPresent())
     return;

   if (GetTag(object_path.value()))
     return;

   VLOG(1) << "NFC tag found: " << object_path.value();

   // Check to see if the tag belongs to this adapter.
   const std::vector<dbus::ObjectPath>& tags =
       DBusThreadManager::Get()->GetNfcTagClient()->
           GetTagsForAdapter(object_path_);
   bool tag_found = false;
   for (std::vector<dbus::ObjectPath>::const_iterator iter = tags.begin();
        iter != tags.end(); ++iter) {
     if (*iter == object_path) {
       tag_found = true;
       break;
     }
   }
   if (!tag_found) {
     VLOG(1) << "Found tag does not belong to the current adapter.";
     return;
   }

   // Create the tag object.
   NfcTagChromeOS* tag_chromeos = new NfcTagChromeOS(object_path);
   SetTag(object_path.value(), tag_chromeos);
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                     TagFound(this, tag_chromeos));
 }

 void NfcAdapterChromeOS::TagRemoved(const dbus::ObjectPath& object_path) {
   VLOG(1) << "NFC tag lost : " << object_path.value();
   device::NfcTag* tag = RemoveTag(object_path.value());
   if (!tag) {
     VLOG(1) << "Removed tag does not belong to the current adapter.";
     return;
   }
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_, TagLost(this, tag));
   delete tag;
 }

 void NfcAdapterChromeOS::SetAdapter(const dbus::ObjectPath& object_path) {
   DCHECK(!IsPresent());
   object_path_ = object_path;
   VLOG(1) << "Using NFC adapter: " << object_path.value();

   NfcAdapterClient::Properties* properties =
       DBusThreadManager::Get()->GetNfcAdapterClient()->
           GetProperties(object_path_);
   PresentChanged(true);
   if (properties->powered.value())
     PoweredChanged(true);
   if (properties->polling.value())
     PollingChanged(true);

   // Create peer objects for peers that were added before the adapter was set.
   const ObjectPathVector& devices =
       DBusThreadManager::Get()->GetNfcDeviceClient()->
           GetDevicesForAdapter(object_path_);
   for (ObjectPathVector::const_iterator iter = devices.begin();
        iter != devices.end(); ++iter) {
     const dbus::ObjectPath& object_path = *iter;
     if (GetPeer(object_path.value()))
       continue;
     NfcPeerChromeOS* peer_chromeos = new NfcPeerChromeOS(object_path);
     SetPeer(object_path.value(), peer_chromeos);
     FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                       PeerFound(this, peer_chromeos));
   }

   // Create tag objects for tags that were added before the adapter was set.
   const std::vector<dbus::ObjectPath>& tags =
       DBusThreadManager::Get()->GetNfcTagClient()->
           GetTagsForAdapter(object_path_);
   for (std::vector<dbus::ObjectPath>::const_iterator iter = tags.begin();
        iter != tags.end(); ++iter) {
     const dbus::ObjectPath& object_path = *iter;
     if (GetTag(object_path.value()))
       continue;
     NfcTagChromeOS* tag_chromeos = new NfcTagChromeOS(object_path);
     SetTag(object_path.value(), tag_chromeos);
     FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                       TagFound(this, tag_chromeos));
   }
 }

 void NfcAdapterChromeOS::RemoveAdapter() {
   DCHECK(IsPresent());
   VLOG(1) << "NFC adapter removed: " << object_path_.value();

   NfcAdapterClient::Properties* properties =
       DBusThreadManager::Get()->GetNfcAdapterClient()->
           GetProperties(object_path_);
   if (properties->powered.value())
     PoweredChanged(false);
   if (properties->polling.value())
     PollingChanged(false);

   // Copy the tags and peers here and clear the original containers so that
   // GetPeers and GetTags return no values during the *Removed observer calls.
   PeerList peers;
   TagList tags;
   GetPeers(&peers);
   GetTags(&tags);
   ClearPeers();
   ClearTags();

   for (PeerList::iterator iter = peers.begin();
        iter != peers.end(); ++iter) {
     device::NfcPeer* peer = *iter;
     FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                       PeerLost(this, peer));
     delete peer;
   }
   for (TagList::iterator iter = tags.begin();
        iter != tags.end(); ++iter) {
     device::NfcTag* tag = *iter;
     FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                       TagLost(this, tag));
     delete tag;
   }

   object_path_ = dbus::ObjectPath("");
   PresentChanged(false);
 }

 void NfcAdapterChromeOS::PoweredChanged(bool powered) {
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                     AdapterPoweredChanged(this, powered));
 }

 void NfcAdapterChromeOS::PollingChanged(bool polling) {
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                     AdapterPollingChanged(this, polling));
 }

 void NfcAdapterChromeOS::PresentChanged(bool present) {
   FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
                     AdapterPresentChanged(this, present));
 }

 void NfcAdapterChromeOS::OnSetPowered(const base::Closure& callback,
                                       const ErrorCallback& error_callback,
                                       bool success) {
   VLOG(1) << "NfcAdapterChromeOS::OnSetPowered result: " << success;
   if (success) {
     // TODO(armansito): There is a bug in neard 0.13 that causes it not to emit
     // a signal when the "Powered" property changes. Sync the properties here,
     // but remove it in neard 0.14.
     if (IsPresent()) {
       DBusThreadManager::Get()->GetNfcAdapterClient()->
           GetProperties(object_path_)->GetAll();
     }
     callback.Run();
   } else {
     LOG(ERROR) << "Failed to power up the NFC antenna radio.";
     error_callback.Run();
   }
 }

 void NfcAdapterChromeOS::OnStartPolling(const base::Closure& callback) {
   callback.Run();
 }

 void NfcAdapterChromeOS::OnStartPollingError(
     const ErrorCallback& error_callback,
     const std::string& error_name,
     const std::string& error_message) {
   LOG(ERROR) << object_path_.value() << ": Failed to start polling: "
              << error_name << ": " << error_message;
   error_callback.Run();
 }

 void NfcAdapterChromeOS::OnStopPolling(const base::Closure& callback) {
   callback.Run();
 }

 void NfcAdapterChromeOS::OnStopPollingError(
     const ErrorCallback& error_callback,
     const std::string& error_name,
     const std::string& error_message) {
   LOG(ERROR) << object_path_.value() << ": Failed to stop polling: "
              << error_name << ": " << error_message;
   error_callback.Run();
 }

 }  // namespace chromeos
	// 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 "device/nfc/nfc_adapter_chromeos.h"

	#include <vector>

	#include "base/callback.h"
	#include "base/logging.h"
	#include "chromeos/dbus/dbus_thread_manager.h"
	#include "device/nfc/nfc_peer_chromeos.h"
	#include "device/nfc/nfc_tag_chromeos.h"
	#include "third_party/cros_system_api/dbus/service_constants.h"

	namespace chromeos {

	namespace {

	typedef std::vector<dbus::ObjectPath> ObjectPathVector;

	} // namespace

	NfcAdapterChromeOS::NfcAdapterChromeOS()
	: weak_ptr_factory_(this) {
	DBusThreadManager::Get()->GetNfcAdapterClient()->AddObserver(this);
	DBusThreadManager::Get()->GetNfcDeviceClient()->AddObserver(this);
	DBusThreadManager::Get()->GetNfcTagClient()->AddObserver(this);

	const ObjectPathVector& object_paths =
	DBusThreadManager::Get()->GetNfcAdapterClient()->GetAdapters();
	if (!object_paths.empty()) {
	VLOG(1) << object_paths.size() << " NFC adapter(s) available.";
	SetAdapter(object_paths[0]);
	}
	}

	NfcAdapterChromeOS::~NfcAdapterChromeOS() {
	DBusThreadManager::Get()->GetNfcAdapterClient()->RemoveObserver(this);
	DBusThreadManager::Get()->GetNfcDeviceClient()->RemoveObserver(this);
	DBusThreadManager::Get()->GetNfcTagClient()->RemoveObserver(this);
	}

	void NfcAdapterChromeOS::AddObserver(NfcAdapter::Observer* observer) {
	DCHECK(observer);
	observers_.AddObserver(observer);
	}

	void NfcAdapterChromeOS::RemoveObserver(NfcAdapter::Observer* observer) {
	DCHECK(observer);
	observers_.RemoveObserver(observer);
	}

	bool NfcAdapterChromeOS::IsPresent() const {
	return !object_path_.value().empty();
	}

	bool NfcAdapterChromeOS::IsPowered() const {
	if (!IsPresent())
	return false;
	return DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_)->powered.value();
	}

	bool NfcAdapterChromeOS::IsPolling() const {
	if (!IsPresent())
	return false;
	return DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_)->polling.value();
	}

	bool NfcAdapterChromeOS::IsInitialized() const {
	return true;
	}

	void NfcAdapterChromeOS::SetPowered(bool powered,
	const base::Closure& callback,
	const ErrorCallback& error_callback) {
	if (!IsPresent()) {
	LOG(WARNING) << "Adapter not present. Cannot power up the antenna.";
	error_callback.Run();
	return;
	}
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_)->powered.Set(
	powered,
	base::Bind(&NfcAdapterChromeOS::OnSetPowered,
	weak_ptr_factory_.GetWeakPtr(),
	callback,
	error_callback));
	}

	void NfcAdapterChromeOS::StartPolling(const base::Closure& callback,
	const ErrorCallback& error_callback) {
	// Always poll in "Initiator" mode.
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	StartPollLoop(object_path_,
	nfc_adapter::kModeInitiator,
	base::Bind(&NfcAdapterChromeOS::OnStartPolling,
	weak_ptr_factory_.GetWeakPtr(),
	callback),
	base::Bind(&NfcAdapterChromeOS::OnStartPollingError,
	weak_ptr_factory_.GetWeakPtr(),
	error_callback));
	}

	void NfcAdapterChromeOS::StopPolling(const base::Closure& callback,
	const ErrorCallback& error_callback) {
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	StopPollLoop(object_path_,
	base::Bind(&NfcAdapterChromeOS::OnStopPolling,
	weak_ptr_factory_.GetWeakPtr(),
	callback),
	base::Bind(&NfcAdapterChromeOS::OnStopPollingError,
	weak_ptr_factory_.GetWeakPtr(),
	error_callback));
	}

	void NfcAdapterChromeOS::AdapterAdded(const dbus::ObjectPath& object_path) {
	// Set the adapter to the newly added adapter only if no adapter is present.
	if (!IsPresent())
	SetAdapter(object_path);
	}

	void NfcAdapterChromeOS::AdapterRemoved(const dbus::ObjectPath& object_path) {
	if (object_path != object_path_)
	return;

	// The current adapter was removed, so mark us as not present and clean up
	// peers and tags.
	RemoveAdapter();

	// There may still be other adapters present on the system. Set the next
	// available adapter as the current one.
	const ObjectPathVector& object_paths =
	DBusThreadManager::Get()->GetNfcAdapterClient()->GetAdapters();
	for (ObjectPathVector::const_iterator iter =
	object_paths.begin();
	iter != object_paths.end(); ++iter) {
	// The removed object will still be available until the call to
	// AdapterRemoved returns. Make sure that we are not re-adding the
	// removed adapter.
	if (*iter == object_path)
	continue;
	SetAdapter(*iter);
	}
	}

	void NfcAdapterChromeOS::AdapterPropertyChanged(
	const dbus::ObjectPath& object_path,
	const std::string& property_name) {
	if (object_path != object_path_)
	return;
	NfcAdapterClient::Properties* properties =
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_);
	if (property_name == properties->powered.name())
	PoweredChanged(properties->powered.value());
	else if (property_name == properties->polling.name())
	PollingChanged(properties->polling.value());
	}

	void NfcAdapterChromeOS::DeviceAdded(const dbus::ObjectPath& object_path) {
	if (!IsPresent())
	return;

	if (GetPeer(object_path.value()))
	return;

	VLOG(1) << "NFC device found: " << object_path.value();

	// Check to see if the device belongs to this adapter.
	const ObjectPathVector& devices =
	DBusThreadManager::Get()->GetNfcDeviceClient()->
	GetDevicesForAdapter(object_path_);
	bool device_found = false;
	for (ObjectPathVector::const_iterator iter = devices.begin();
	iter != devices.end(); ++iter) {
	if (*iter == object_path) {
	device_found = true;
	break;
	}
	}
	if (!device_found) {
	VLOG(1) << "Found peer device does not belong to the current adapter.";
	return;
	}

	// Create the peer object.
	NfcPeerChromeOS* peer_chromeos = new NfcPeerChromeOS(object_path);
	SetPeer(object_path.value(), peer_chromeos);
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	PeerFound(this, peer_chromeos));
	}

	void NfcAdapterChromeOS::DeviceRemoved(const dbus::ObjectPath& object_path) {
	VLOG(1) << "NFC device lost: " << object_path.value();
	device::NfcPeer* peer = RemovePeer(object_path.value());
	if (!peer) {
	VLOG(1) << "Removed peer device does not belong to the current adapter.";
	return;
	}
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_, PeerLost(this, peer));
	delete peer;
	}

	void NfcAdapterChromeOS::TagAdded(const dbus::ObjectPath& object_path) {
	if (!IsPresent())
	return;

	if (GetTag(object_path.value()))
	return;

	VLOG(1) << "NFC tag found: " << object_path.value();

	// Check to see if the tag belongs to this adapter.
	const std::vector<dbus::ObjectPath>& tags =
	DBusThreadManager::Get()->GetNfcTagClient()->
	GetTagsForAdapter(object_path_);
	bool tag_found = false;
	for (std::vector<dbus::ObjectPath>::const_iterator iter = tags.begin();
	iter != tags.end(); ++iter) {
	if (*iter == object_path) {
	tag_found = true;
	break;
	}
	}
	if (!tag_found) {
	VLOG(1) << "Found tag does not belong to the current adapter.";
	return;
	}

	// Create the tag object.
	NfcTagChromeOS* tag_chromeos = new NfcTagChromeOS(object_path);
	SetTag(object_path.value(), tag_chromeos);
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	TagFound(this, tag_chromeos));
	}

	void NfcAdapterChromeOS::TagRemoved(const dbus::ObjectPath& object_path) {
	VLOG(1) << "NFC tag lost : " << object_path.value();
	device::NfcTag* tag = RemoveTag(object_path.value());
	if (!tag) {
	VLOG(1) << "Removed tag does not belong to the current adapter.";
	return;
	}
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_, TagLost(this, tag));
	delete tag;
	}

	void NfcAdapterChromeOS::SetAdapter(const dbus::ObjectPath& object_path) {
	DCHECK(!IsPresent());
	object_path_ = object_path;
	VLOG(1) << "Using NFC adapter: " << object_path.value();

	NfcAdapterClient::Properties* properties =
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_);
	PresentChanged(true);
	if (properties->powered.value())
	PoweredChanged(true);
	if (properties->polling.value())
	PollingChanged(true);

	// Create peer objects for peers that were added before the adapter was set.
	const ObjectPathVector& devices =
	DBusThreadManager::Get()->GetNfcDeviceClient()->
	GetDevicesForAdapter(object_path_);
	for (ObjectPathVector::const_iterator iter = devices.begin();
	iter != devices.end(); ++iter) {
	const dbus::ObjectPath& object_path = *iter;
	if (GetPeer(object_path.value()))
	continue;
	NfcPeerChromeOS* peer_chromeos = new NfcPeerChromeOS(object_path);
	SetPeer(object_path.value(), peer_chromeos);
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	PeerFound(this, peer_chromeos));
	}

	// Create tag objects for tags that were added before the adapter was set.
	const std::vector<dbus::ObjectPath>& tags =
	DBusThreadManager::Get()->GetNfcTagClient()->
	GetTagsForAdapter(object_path_);
	for (std::vector<dbus::ObjectPath>::const_iterator iter = tags.begin();
	iter != tags.end(); ++iter) {
	const dbus::ObjectPath& object_path = *iter;
	if (GetTag(object_path.value()))
	continue;
	NfcTagChromeOS* tag_chromeos = new NfcTagChromeOS(object_path);
	SetTag(object_path.value(), tag_chromeos);
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	TagFound(this, tag_chromeos));
	}
	}

	void NfcAdapterChromeOS::RemoveAdapter() {
	DCHECK(IsPresent());
	VLOG(1) << "NFC adapter removed: " << object_path_.value();

	NfcAdapterClient::Properties* properties =
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_);
	if (properties->powered.value())
	PoweredChanged(false);
	if (properties->polling.value())
	PollingChanged(false);

	// Copy the tags and peers here and clear the original containers so that
	// GetPeers and GetTags return no values during the *Removed observer calls.
	PeerList peers;
	TagList tags;
	GetPeers(&peers);
	GetTags(&tags);
	ClearPeers();
	ClearTags();

	for (PeerList::iterator iter = peers.begin();
	iter != peers.end(); ++iter) {
	device::NfcPeer* peer = *iter;
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	PeerLost(this, peer));
	delete peer;
	}
	for (TagList::iterator iter = tags.begin();
	iter != tags.end(); ++iter) {
	device::NfcTag* tag = *iter;
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	TagLost(this, tag));
	delete tag;
	}

	object_path_ = dbus::ObjectPath("");
	PresentChanged(false);
	}

	void NfcAdapterChromeOS::PoweredChanged(bool powered) {
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	AdapterPoweredChanged(this, powered));
	}

	void NfcAdapterChromeOS::PollingChanged(bool polling) {
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	AdapterPollingChanged(this, polling));
	}

	void NfcAdapterChromeOS::PresentChanged(bool present) {
	FOR_EACH_OBSERVER(NfcAdapter::Observer, observers_,
	AdapterPresentChanged(this, present));
	}

	void NfcAdapterChromeOS::OnSetPowered(const base::Closure& callback,
	const ErrorCallback& error_callback,
	bool success) {
	VLOG(1) << "NfcAdapterChromeOS::OnSetPowered result: " << success;
	if (success) {
	// TODO(armansito): There is a bug in neard 0.13 that causes it not to emit
	// a signal when the "Powered" property changes. Sync the properties here,
	// but remove it in neard 0.14.
	if (IsPresent()) {
	DBusThreadManager::Get()->GetNfcAdapterClient()->
	GetProperties(object_path_)->GetAll();
	}
	callback.Run();
	} else {
	LOG(ERROR) << "Failed to power up the NFC antenna radio.";
	error_callback.Run();
	}
	}

	void NfcAdapterChromeOS::OnStartPolling(const base::Closure& callback) {
	callback.Run();
	}

	void NfcAdapterChromeOS::OnStartPollingError(
	const ErrorCallback& error_callback,
	const std::string& error_name,
	const std::string& error_message) {
	LOG(ERROR) << object_path_.value() << ": Failed to start polling: "
	<< error_name << ": " << error_message;
	error_callback.Run();
	}

	void NfcAdapterChromeOS::OnStopPolling(const base::Closure& callback) {
	callback.Run();
	}

	void NfcAdapterChromeOS::OnStopPollingError(
	const ErrorCallback& error_callback,
	const std::string& error_name,
	const std::string& error_message) {
	LOG(ERROR) << object_path_.value() << ": Failed to stop polling: "
	<< error_name << ": " << error_message;
	error_callback.Run();
	}

	} // namespace chromeos