| /* |
| * 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 if (errorCode == ErrorCodes.ERROR_NOT_SUPPORTED) { |
| throw new UnsupportedOperationException("Connecting to " + |
| "this technology is not supported by the NFC " + |
| "adapter."); |
| } 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().resetTimeouts(); |
| mTag.getTagService().reconnect(mTag.getServiceHandle()); |
| } catch (RemoteException e) { |
| Log.e(TAG, "NFC service dead", e); |
| } finally { |
| mIsConnected = false; |
| mTag.setTechnologyDisconnected(); |
| } |
| } |
| |
| /** Internal getMaxTransceiveLength() */ |
| int getMaxTransceiveLengthInternal() { |
| try { |
| return mTag.getTagService().getMaxTransceiveLength(mSelectedTechnology); |
| } catch (RemoteException e) { |
| Log.e(TAG, "NFC service dead", e); |
| return 0; |
| } |
| } |
| /** 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 { |
| return result.getResponseOrThrow(); |
| } |
| } catch (RemoteException e) { |
| Log.e(TAG, "NFC service dead", e); |
| throw new IOException("NFC service died"); |
| } |
| } |
| } |