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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.ErrorCodes;
import android.nfc.Tag;
import android.nfc.TagLostException;
import android.nfc.TransceiveResult;
import android.os.RemoteException;
import android.util.Log;
import java.io.IOException;
/**
* A base class for tag technologies that are built on top of transceive().
*/
/* package */ abstract class BasicTagTechnology implements TagTechnology {
private static final String TAG = "NFC";
/*package*/ final Tag mTag;
/*package*/ boolean mIsConnected;
/*package*/ int mSelectedTechnology;
BasicTagTechnology(Tag tag, int tech) throws RemoteException {
mTag = tag;
mSelectedTechnology = tech;
}
@Override
public Tag getTag() {
return mTag;
}
/** Internal helper to throw IllegalStateException if the technology isn't connected */
void checkConnected() {
if ((mTag.getConnectedTechnology() != mSelectedTechnology) ||
(mTag.getConnectedTechnology() == -1)) {
throw new IllegalStateException("Call connect() first!");
}
}
@Override
public boolean isConnected() {
if (!mIsConnected) {
return false;
}
try {
return mTag.getTagService().isPresent(mTag.getServiceHandle());
} catch (RemoteException e) {
Log.e(TAG, "NFC service dead", e);
return false;
}
}
@Override
public void connect() throws IOException {
try {
int errorCode = mTag.getTagService().connect(mTag.getServiceHandle(),
mSelectedTechnology);
if (errorCode == ErrorCodes.SUCCESS) {
// Store this in the tag object
mTag.setConnectedTechnology(mSelectedTechnology);
mIsConnected = true;
} else {
throw new IOException();
}
} catch (RemoteException e) {
Log.e(TAG, "NFC service dead", e);
throw new IOException("NFC service died");
}
}
/** @hide */
@Override
public void reconnect() throws IOException {
if (!mIsConnected) {
throw new IllegalStateException("Technology not connected yet");
}
try {
int errorCode = mTag.getTagService().reconnect(mTag.getServiceHandle());
if (errorCode != ErrorCodes.SUCCESS) {
mIsConnected = false;
mTag.setTechnologyDisconnected();
throw new IOException();
}
} catch (RemoteException e) {
mIsConnected = false;
mTag.setTechnologyDisconnected();
Log.e(TAG, "NFC service dead", e);
throw new IOException("NFC service died");
}
}
@Override
public void close() throws IOException {
try {
/* Note that we don't want to physically disconnect the tag,
* but just reconnect to it to reset its state
*/
mTag.getTagService().reconnect(mTag.getServiceHandle());
} catch (RemoteException e) {
Log.e(TAG, "NFC service dead", e);
} finally {
mIsConnected = false;
mTag.setTechnologyDisconnected();
}
}
/** Internal transceive */
/*package*/ byte[] transceive(byte[] data, boolean raw) throws IOException {
checkConnected();
try {
TransceiveResult result = mTag.getTagService().transceive(mTag.getServiceHandle(),
data, raw);
if (result == null) {
throw new IOException("transceive failed");
} else {
if (result.isSuccessful()) {
return result.getResponseData();
} else {
if (result.isTagLost()) {
throw new TagLostException("Tag was lost.");
}
else {
throw new IOException("transceive failed");
}
}
}
} catch (RemoteException e) {
Log.e(TAG, "NFC service dead", e);
throw new IOException("NFC service died");
}
}
}
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