chromeos: Remove unused NFC D-Bus client library

device/nfc/nfc_tag.h

-// 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.
-
-#ifndef DEVICE_NFC_NFC_TAG_H_
-#define DEVICE_NFC_NFC_TAG_H_
-
-#include "base/macros.h"
-#include "device/nfc/nfc_tag_technology.h"
-
-namespace device {
-
-// NfcTag represents a remote NFC tag. An NFC tag is a passive NFC device,
-// powered by the NFC field of the local adapter while it is in range. Tags
-// can come in many forms, such as stickers, key fobs, or even embedded in a
-// more sofisticated device.
-//
-// Tags can have a wide range of capabilities. Simple tags just offer
-// read/write semantics, and contain some one time programmable areas to make
-// read-only. More complex tags offer math operations and per-sector access
-// control and authentication. The most sophisticated tags contain operating
-// environments allowing complex interactions with the code executing on the
-// tag.
-//
-// The NfcTag class facilitates possible interactions with a tag. The most
-// common usage of a tag is to exchange NDEF messages, but different kinds of
-// I/O can be performed using the NfcTagTechnology classes.
-class NfcTag {
- public:
-  // NFC tag types.
-  enum TagType {
-    kTagType1,
-    kTagType2,
-    kTagType3,
-    kTagType4,
-    kTagTypeUnknown,
-  };
-
-  // NFC protocols that a tag can support. A tag will usually support only one
-  // of these.
-  enum Protocol {
-    kProtocolFelica,
-    kProtocolIsoDep,
-    kProtocolJewel,
-    kProtocolMifare,
-    kProtocolNfcDep,
-    kProtocolUnknown
-  };
-
-  // Interface for observing changes from NFC tags.
-  class Observer {
-   public:
-    virtual ~Observer() {}
-
-    // Called when the tag type has been determined.
-    virtual void TagTypeChanged(NfcTag* tag, TagType type) {}
-
-    // Called when the write access to the tag has been determined or changed.
-    virtual void TagWritePermissionChanged(NfcTag* tag, bool read_only) {}
-
-    // Called when the underlying NFC protocol has been determined.
-    virtual void TagSupportedProtocolChanged(NfcTag* tag, Protocol protocol) {}
-
-    // Called when all initial values of the tag properties have been received
-    // from the remote tag and |tag| is ready to use.
-    virtual void TagReady(NfcTag* tag) {}
-  };
-
-  virtual ~NfcTag();
-
-  // Adds and removes observers for events on this NFC tag. If monitoring
-  // multiple tags, check the |tag| parameter of observer methods to determine
-  // which tag is issuing the event.
-  virtual void AddObserver(Observer* observer) = 0;
-  virtual void RemoveObserver(Observer* observer) = 0;
-
-  // Returns the unique identifier assigned to this tag.
-  virtual std::string GetIdentifier() const = 0;
-
-  // Returns the current tag's NFC forum specified "type".
-  virtual TagType GetType() const = 0;
-
-  // Returns true, if this tag is read-only and cannot be written to.
-  virtual bool IsReadOnly() const = 0;
-
-  // Returns the current tag's supported NFC protocol.
-  virtual Protocol GetSupportedProtocol() const = 0;
-
-  // Returns a bitmask of the tag I/O technologies supported by this tag.
-  virtual NfcTagTechnology::TechnologyTypeMask
-      GetSupportedTechnologies() const = 0;
-
-  // Returns true, if all tag properties have been received from the remote tag
-  // and this object is ready to use.
-  virtual bool IsReady() const = 0;
-
-  // Returns a pointer to the NDEF technology object that allows I/O on NDEF
-  // records. If NDEF is not supported by this tag, operations that are
-  // performed on the returned instance may not succeed. Users can determine
-  // support by calling NfcTagTechnology::IsSupportedByTag. The returned
-  // instance is owned by this tag.
-  virtual NfcNdefTagTechnology* GetNdefTagTechnology() = 0;
-
- protected:
-  NfcTag();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NfcTag);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_NFC_NFC_TAG_H_