/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.nfc.tech;
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import android.nfc.ErrorCodes;
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import android.nfc.Tag;
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import android.nfc.TransceiveResult;
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import android.os.RemoteException;
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import android.util.Log;
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import java.io.IOException;
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/**
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* A base class for tag technologies that are built on top of transceive().
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*/
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abstract class BasicTagTechnology implements TagTechnology {
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private static final String TAG = "NFC";
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final Tag mTag;
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boolean mIsConnected;
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int mSelectedTechnology;
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BasicTagTechnology(Tag tag, int tech) throws RemoteException {
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mTag = tag;
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mSelectedTechnology = tech;
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}
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@Override
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public Tag getTag() {
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return mTag;
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}
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/** Internal helper to throw IllegalStateException if the technology isn't connected */
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void checkConnected() {
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if ((mTag.getConnectedTechnology() != mSelectedTechnology) ||
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(mTag.getConnectedTechnology() == -1)) {
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throw new IllegalStateException("Call connect() first!");
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}
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}
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@Override
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public boolean isConnected() {
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if (!mIsConnected) {
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return false;
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}
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try {
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return mTag.getTagService().isPresent(mTag.getServiceHandle());
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} catch (RemoteException e) {
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Log.e(TAG, "NFC service dead", e);
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return false;
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}
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}
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@Override
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public void connect() throws IOException {
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try {
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int errorCode = mTag.getTagService().connect(mTag.getServiceHandle(),
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mSelectedTechnology);
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if (errorCode == ErrorCodes.SUCCESS) {
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// Store this in the tag object
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mTag.setConnectedTechnology(mSelectedTechnology);
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mIsConnected = true;
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} else if (errorCode == ErrorCodes.ERROR_NOT_SUPPORTED) {
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throw new UnsupportedOperationException("Connecting to " +
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"this technology is not supported by the NFC " +
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"adapter.");
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} else {
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throw new IOException();
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}
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} catch (RemoteException e) {
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Log.e(TAG, "NFC service dead", e);
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throw new IOException("NFC service died");
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}
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}
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/** @hide */
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@Override
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public void reconnect() throws IOException {
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if (!mIsConnected) {
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throw new IllegalStateException("Technology not connected yet");
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}
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try {
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int errorCode = mTag.getTagService().reconnect(mTag.getServiceHandle());
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if (errorCode != ErrorCodes.SUCCESS) {
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mIsConnected = false;
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mTag.setTechnologyDisconnected();
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throw new IOException();
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}
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} catch (RemoteException e) {
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mIsConnected = false;
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mTag.setTechnologyDisconnected();
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Log.e(TAG, "NFC service dead", e);
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throw new IOException("NFC service died");
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}
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}
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@Override
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public void close() throws IOException {
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try {
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/* Note that we don't want to physically disconnect the tag,
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* but just reconnect to it to reset its state
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*/
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mTag.getTagService().resetTimeouts();
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mTag.getTagService().reconnect(mTag.getServiceHandle());
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} catch (RemoteException e) {
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Log.e(TAG, "NFC service dead", e);
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} finally {
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mIsConnected = false;
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mTag.setTechnologyDisconnected();
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}
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}
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/** Internal getMaxTransceiveLength() */
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int getMaxTransceiveLengthInternal() {
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try {
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return mTag.getTagService().getMaxTransceiveLength(mSelectedTechnology);
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} catch (RemoteException e) {
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Log.e(TAG, "NFC service dead", e);
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return 0;
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}
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}
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/** Internal transceive */
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byte[] transceive(byte[] data, boolean raw) throws IOException {
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checkConnected();
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try {
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TransceiveResult result = mTag.getTagService().transceive(mTag.getServiceHandle(),
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data, raw);
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if (result == null) {
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throw new IOException("transceive failed");
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} else {
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return result.getResponseOrThrow();
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}
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} catch (RemoteException e) {
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Log.e(TAG, "NFC service dead", e);
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throw new IOException("NFC service died");
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}
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}
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}
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