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/*
* 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.
*/
package android.nfc.tech;
import android.nfc.Tag;
import android.os.Bundle;
import android.os.RemoteException;
import java.io.IOException;
/**
* A low-level connection to a {@link Tag} using the NFC-B technology, also known as
* ISO1443-3B.
*
* <p>You can acquire this kind of connection with {@link #get}.
* Use this class to send and receive data with {@link #transceive transceive()}.
*
* <p>Applications must implement their own protocol stack on top of
* {@link #transceive transceive()}.
*
* <p class="note"><strong>Note:</strong>
* Use of this class requires the {@link android.Manifest.permission#NFC}
* permission.
*/
public final class NfcB extends BasicTagTechnology {
/** @hide */
public static final String EXTRA_APPDATA = "appdata";
/** @hide */
public static final String EXTRA_PROTINFO = "protinfo";
private byte[] mAppData;
private byte[] mProtInfo;
/**
* Returns an instance of this tech for the given tag. If the tag doesn't support
* this tech type null is returned.
*
* @param tag The tag to get the tech from
*/
public static NfcB get(Tag tag) {
if (!tag.hasTech(TagTechnology.NFC_B)) return null;
try {
return new NfcB(tag);
} catch (RemoteException e) {
return null;
}
}
/** @hide */
public NfcB(Tag tag) throws RemoteException {
super(tag, TagTechnology.NFC_B);
Bundle extras = tag.getTechExtras(TagTechnology.NFC_B);
mAppData = extras.getByteArray(EXTRA_APPDATA);
mProtInfo = extras.getByteArray(EXTRA_PROTINFO);
}
/**
* Returns the Application Data bytes from the ATQB/SENSB_RES
* bytes discovered at tag discovery.
*/
public byte[] getApplicationData() {
return mAppData;
}
/**
* Returns the Protocol Info bytes from the ATQB/SENSB_RES
* bytes discovered at tag discovery.
*/
public byte[] getProtocolInfo() {
return mProtInfo;
}
/**
* Send data to a tag and receive the response.
* <p>
* This method will block until the response is received. It can be canceled
* with {@link #close}.
* <p>Requires {@link android.Manifest.permission#NFC} permission.
*
* @param data bytes to send
* @return bytes received in response
* @throws IOException if the target is lost or connection closed
*/
public byte[] transceive(byte[] data) throws IOException {
return transceive(data, true);
}
}
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