1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* File : NFCTag.java
* Original-Author : Trusted Logic S.A. (Daniel Tomas)
* Created : 26-02-2010
*/
package com.trustedlogic.trustednfc.android;
import java.io.IOException;
import android.os.RemoteException;
import android.util.Log;
import com.trustedlogic.trustednfc.android.internal.ErrorCodes;
/**
* This class represents tags with no known formatting. One can use the method
* {@link #isNdef()} to determine if the tag can store NDEF-formatted messages.
* <p>
*
* <pre class="prettyprint">
* if (tag.isNdef()) {
* NdefTag ndefTag = (NdefTag) tag;
* NdefMessage msg = ndefTag.read();
* }
* </pre>
*
* @since AA01.04
* @see NdefMessage
* @hide
*/
public class NfcTag {
private static final String TAG = "NfcTag";
/**
* The handle returned by the NFC service and used to identify the tag in
* every call of this class.
*
* @hide
*/
protected int mHandle;
/**
* The entry point for tag operations.
*
* @hide
*/
protected INfcTag mService;
/**
* Flag set when the object is closed and thus not usable any more.
*
* @hide
*/
protected boolean isClosed = false;
/**
* Flag set when the tag is connected.
*
* @hide
*/
protected boolean isConnected = false;
/**
* Flag set when a check NDEF is performed.
*
* @hide
*/
protected boolean isNdef = false;
/**
* Check if tag is still opened.
*
* @return data sent by the P2pInitiator.
* @throws NfcException if accessing a closed target.
*
* @hide
*/
public void checkState() throws NfcException {
if (isClosed) {
throw new NfcException("Tag has been closed.");
}
if (!isConnected) {
throw new NfcException("Tag is not connected.");
}
}
/**
* Internal constructor for the NfcTag class.
*
* @param service The entry point to the Nfc Service for NfcTag class.
* @param handle The handle returned by the NFC service and used to identify
* the tag in subsequent calls.
* @hide
*/
NfcTag(INfcTag service, int handle) {
this.mService = service;
this.mHandle = handle;
}
/**
* Connects to the tag. This shall be called prior to any other operation on
* the tag.
*
* @throws IOException if the tag has been lost or the connection has been
* closed.
* @throws nfcException if the tag is already in connected state.
*/
public void connect() throws NfcException, IOException {
// Check state
if (isClosed) {
throw new NfcException("Tag has been closed.");
}
if (isConnected) {
throw new NfcException("Already connected");
}
// Perform connect
try {
int result = mService.connect(mHandle);
if (ErrorCodes.isError(result)) {
if (result == ErrorCodes.ERROR_IO) {
throw new IOException("Failed to connect");
}
else {
throw NfcManager.convertErrorToNfcException(result);
}
}
isConnected = true;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in connect(): ", e);
}
}
/**
* Disconnects from the tag. This must be called so that other targets can
* be discovered. It restarts the NFC discovery loop.
*
* @throws NfcException if the tag is already in disconnected state or not connected
*/
public void close() throws NfcException {
// Check state
checkState();
try {
mService.close(mHandle);
isClosed = true;
isConnected = false;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in close(): ", e);
}
}
/**
* Exchanges raw data with the tag, whatever the tag type.
*
* To exchange APDUs with a ISO14443-4-compliant tag, the data parameter
* must be filled with the C-APDU (CLA, INS, P1, P2 [, ...]). The returned
* data consists of the R-APDU ([...,] SW1, SW2).
*
* @param data data to be sent to the tag
* @return data sent in response by the tag
* @throws IOException if the tag has been lost or the connection has been
* closed.
* @throws NfcException in case of failure within the stack
*/
public byte[] transceive(byte[] data) throws IOException, NfcException {
// Check state
checkState();
// Perform transceive
try {
byte[] response = mService.transceive(mHandle, data);
if (response == null) {
throw new IOException("Transceive failed");
}
return response;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in transceive(): ", e);
return null;
}
}
/**
* Checks whether tag is NDEF-compliant or not.
*
* @return true if the tag is NDEF-compliant, false otherwise
* @throws NfcException in case an error occurred when trying to determine
* whether the tag is NDEF-compliant
*/
public boolean isNdef() throws NfcException {
// Check state
checkState();
// Perform Check Ndef
try {
isNdef = mService.isNdef(mHandle);
return isNdef;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in isNdef(): ", e);
return false;
}
}
/**
* Returns target type. constants.
*
* @return tag type.
*/
public String getType() {
try {
return mService.getType(mHandle);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in getType(): ", e);
return null;
}
}
/**
* Returns target UID.
*
* @return tag UID.
*/
public byte[] getUid() {
try {
return mService.getUid(mHandle);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in getType(): ", e);
return null;
}
}
}
|