chromeos: Remove unused NFC D-Bus client library

device/nfc/nfc_tag_technology.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_TECHNOLOGY_H_
-#define DEVICE_NFC_NFC_TAG_TECHNOLOGY_H_
-
-#include <stdint.h>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "device/nfc/nfc_ndef_record.h"
-
-namespace device {
-
-class NfcTag;
-
-// NfcTagTechnology represents an NFC technology that allows a certain type of
-// I/O operation on an NFC tag. NFC tags can support a wide array of protocols.
-// The NfcTagTechnology hierarchy allows both raw and high-level I/O operations
-// on NFC tags. Do not create instances of these objects directly. Instead,
-// obtain a handle directly from an NfcTag object.
-class NfcTagTechnology {
- public:
-  // The various I/O technologies that an NFC tag can support.
-  enum TechnologyType {
-    kTechnologyTypeNfcA = 1 << 0,
-    kTechnologyTypeNfcB = 1 << 1,
-    kTechnologyTypeNfcF = 1 << 2,
-    kTechnologyTypeNfcV = 1 << 3,
-    kTechnologyTypeIsoDep = 1 << 4,
-    kTechnologyTypeNdef = 1 << 5
-  };
-  typedef uint32_t TechnologyTypeMask;
-
-  virtual ~NfcTagTechnology();
-
-  // Returns true, if the underlying tag supports the NFC tag technology that
-  // this instance represents.
-  virtual bool IsSupportedByTag() const = 0;
-
-  // Returns a pointer to the associated NfcTag instance.
-  NfcTag* tag() const { return tag_; }
-
- protected:
-  // Constructs a technology instance, where |tag| is the NFC tag that this
-  // instance will operate on. Clients aren't allowed to instantiate classes
-  // directly. They should use the static "Create" methods defined in each
-  // subclass to obtain the platform specific implementation.
-  explicit NfcTagTechnology(NfcTag* tag);
-
- private:
-  NfcTagTechnology();
-
-  // The underlying NfcTag instance that data exchange operations through this
-  // instance are performed on.
-  NfcTag* tag_;
-
-  DISALLOW_COPY_AND_ASSIGN(NfcTagTechnology);
-};
-
-// NfcNdefTagTechnology allows reading and writing NDEF messages to a tag. This
-// is the most commonly used data exchange format in NFC. NDEF is a data
-// exchange format and is the top most layer of the protocol stack. NDEF itself
-// is not a protocol; data is typically formatted in a way that is defined by
-// the NDEF format and then transmitted via one of the underlying protocols.
-// Hence all tags are capable of NDEF data exchange, however, all tags don't
-// necessarily use NDEF to operate (e.g. a tag may contain a smart chip that
-// does data processing on ISO-DEP based APDUs and ignores NDEF). This is why,
-// even if a tag inherently supports NDEF, operations done via this class may
-// not necessarily succeed.
-class NfcNdefTagTechnology : public NfcTagTechnology {
- public:
-  // The ErrorCallback is used by methods to asynchronously report errors.
-  typedef base::Closure ErrorCallback;
-
-  ~NfcNdefTagTechnology() override;
-
-  // Interface for observing changes from NFC tags related to NDEF records.
-  class Observer {
-   public:
-    virtual ~Observer() {}
-
-    // This method will be called when an NDEF record |record|, stored on the
-    // NFC tag |tag| has been read. This method will be called multiple times
-    // as records are read from the tag or when the tag's records change (e.g.
-    // when the tag has been rewritten). All received records can be accessed by
-    // calling GetNdefMessage().
-    virtual void RecordReceived(NfcTag* tag, const NfcNdefRecord* record) {}
-  };
-
-  // 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;
-
-  // NfcTagTechnology override.
-  bool IsSupportedByTag() const override;
-
-  // Returns all NDEF records that were received from the tag in the form of an
-  // NDEF message. If the returned NDEF message contains no records, this only
-  // means that no records have yet been received from the tag. Users should
-  // use this method in conjunction with the NfcTag::Observer::RecordsReceived
-  // method to be notified when the records are ready.
-  virtual const NfcNdefMessage& GetNdefMessage() const = 0;
-
-  // Writes the given NDEF message to the underlying tag, overwriting any
-  // existing NDEF message on it. On success, |callback| will be invoked. On
-  // failure, |error_callback| will be invoked. This method can fail, if the
-  // underlying tag does not support NDEF as a technology.
-  virtual void WriteNdef(const NfcNdefMessage& message,
-                         const base::Closure& callback,
-                         const ErrorCallback& error_callback) = 0;
-
- protected:
-  // Constructs a technology instance, where |tag| is the NFC tag that this
-  // instance will operate on.
-  explicit NfcNdefTagTechnology(NfcTag* tag);
-
-  DISALLOW_COPY_AND_ASSIGN(NfcNdefTagTechnology);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_NFC_NFC_TAG_TECHNOLOGY_H_