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| 1 // Copyright 2016 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 package org.chromium.device.nfc; | |
| 6 | |
| 7 import android.nfc.FormatException; | |
| 8 import android.nfc.NdefMessage; | |
| 9 import android.nfc.Tag; | |
| 10 import android.nfc.TagLostException; | |
| 11 import android.nfc.tech.Ndef; | |
| 12 import android.nfc.tech.NdefFormatable; | |
| 13 import android.nfc.tech.TagTechnology; | |
| 14 | |
| 15 import java.io.IOException; | |
| 16 | |
| 17 /** | |
| 18 * Utility class that provides I/O operations for NFC tags. | |
| 19 */ | |
| 20 public class NfcTagHandler { | |
| 21 private final TagTechnology mTech; | |
| 22 private final TagTechnologyHandler mTechHandler; | |
| 23 private boolean mWasConnected; | |
| 24 | |
| 25 /** | |
| 26 * Factory method that creates NfcTagHandler for a given NFC Tag. | |
| 27 * | |
| 28 * @param tag @see android.nfc.Tag | |
| 29 * @return NfcTagHandler or null when unsupported Tag is provided. | |
| 30 */ | |
| 31 public static NfcTagHandler create(Tag tag) { | |
| 32 if (tag == null) return null; | |
| 33 | |
| 34 Ndef ndef = Ndef.get(tag); | |
| 35 if (ndef != null) return new NfcTagHandler(ndef, new NdefHandler(ndef)); | |
| 36 | |
| 37 NdefFormatable formattable = NdefFormatable.get(tag); | |
| 38 if (formattable != null) { | |
| 39 return new NfcTagHandler(formattable, new NdefFormattableHandler(for
mattable)); | |
| 40 } | |
| 41 | |
| 42 return null; | |
| 43 } | |
| 44 | |
| 45 /** | |
| 46 * NdefFormatable and Ndef interfaces have different signatures for operatin
g with NFC tags. | |
| 47 * This interface provides generic methods. | |
| 48 */ | |
| 49 private interface TagTechnologyHandler { | |
| 50 public void write(NdefMessage message) | |
| 51 throws IOException, TagLostException, FormatException, IllegalSt
ateException; | |
| 52 public NdefMessage read() | |
| 53 throws IOException, TagLostException, FormatException, IllegalSt
ateException; | |
| 54 } | |
| 55 | |
| 56 /** | |
| 57 * Implementation of TagTechnologyHandler that uses Ndef tag technology. | |
| 58 * @see android.nfc.tech.Ndef | |
| 59 */ | |
| 60 private static class NdefHandler implements TagTechnologyHandler { | |
| 61 private final Ndef mNdef; | |
| 62 | |
| 63 NdefHandler(Ndef ndef) { | |
| 64 mNdef = ndef; | |
| 65 } | |
| 66 | |
| 67 @Override | |
| 68 public void write(NdefMessage message) | |
| 69 throws IOException, TagLostException, FormatException, IllegalSt
ateException { | |
| 70 mNdef.writeNdefMessage(message); | |
| 71 } | |
| 72 | |
| 73 @Override | |
| 74 public NdefMessage read() | |
| 75 throws IOException, TagLostException, FormatException, IllegalSt
ateException { | |
| 76 return mNdef.getNdefMessage(); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 /** | |
| 81 * Implementation of TagTechnologyHandler that uses NdefFormatable tag techn
ology. | |
| 82 * @see android.nfc.tech.NdefFormatable | |
| 83 */ | |
| 84 private static class NdefFormattableHandler implements TagTechnologyHandler
{ | |
| 85 private final NdefFormatable mNdefFormattable; | |
| 86 | |
| 87 NdefFormattableHandler(NdefFormatable ndefFormattable) { | |
| 88 mNdefFormattable = ndefFormattable; | |
| 89 } | |
| 90 | |
| 91 @Override | |
| 92 public void write(NdefMessage message) | |
| 93 throws IOException, TagLostException, FormatException, IllegalSt
ateException { | |
| 94 mNdefFormattable.format(message); | |
| 95 } | |
| 96 | |
| 97 @Override | |
| 98 public NdefMessage read() throws FormatException { | |
| 99 return NfcTypeConverter.emptyNdefMessage(); | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 protected NfcTagHandler(TagTechnology tech, TagTechnologyHandler handler) { | |
| 104 mTech = tech; | |
| 105 mTechHandler = handler; | |
| 106 } | |
| 107 | |
| 108 /** | |
| 109 * Connects to NFC tag. | |
| 110 */ | |
| 111 public void connect() throws IOException, TagLostException { | |
| 112 if (!mTech.isConnected()) { | |
| 113 mTech.connect(); | |
| 114 mWasConnected = true; | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 /** | |
| 119 * Checks if NFC tag is connected. | |
| 120 */ | |
| 121 public boolean isConnected() { | |
| 122 return mTech.isConnected(); | |
| 123 } | |
| 124 | |
| 125 /** | |
| 126 * Closes connection. | |
| 127 */ | |
| 128 public void close() throws IOException { | |
| 129 mTech.close(); | |
| 130 } | |
| 131 | |
| 132 /** | |
| 133 * Writes NdefMessage to NFC tag. | |
| 134 */ | |
| 135 public void write(NdefMessage message) | |
| 136 throws IOException, TagLostException, FormatException, IllegalStateE
xception { | |
| 137 mTechHandler.write(message); | |
| 138 } | |
| 139 | |
| 140 public NdefMessage read() | |
| 141 throws IOException, TagLostException, FormatException, IllegalStateE
xception { | |
| 142 return mTechHandler.read(); | |
| 143 } | |
| 144 | |
| 145 /** | |
| 146 * If tag was previously connected and subsequent connection to the same tag
fails, consider | |
| 147 * tag to be out of range. | |
| 148 */ | |
| 149 public boolean isTagOutOfRange() { | |
| 150 try { | |
| 151 connect(); | |
| 152 } catch (IOException e) { | |
| 153 return mWasConnected; | |
| 154 } | |
| 155 return false; | |
| 156 } | |
| 157 } | |
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Chromium Code Reviews
Issue 2894373002:
[DeviceService] Move //device/nfc to be part of the internal impl of Device Service (Closed)
