| /* |
| * Copyright 2021 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; |
| |
| import android.annotation.NonNull; |
| import android.nfc.NfcAdapter.ControllerAlwaysOnListener; |
| import android.os.Binder; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.Executor; |
| |
| /** |
| * @hide |
| */ |
| public class NfcControllerAlwaysOnListener extends INfcControllerAlwaysOnListener.Stub { |
| private static final String TAG = NfcControllerAlwaysOnListener.class.getSimpleName(); |
| |
| private final INfcAdapter mAdapter; |
| |
| private final Map<ControllerAlwaysOnListener, Executor> mListenerMap = new HashMap<>(); |
| |
| private boolean mCurrentState = false; |
| private boolean mIsRegistered = false; |
| |
| public NfcControllerAlwaysOnListener(@NonNull INfcAdapter adapter) { |
| mAdapter = adapter; |
| } |
| |
| /** |
| * Register a {@link ControllerAlwaysOnListener} with this |
| * {@link NfcControllerAlwaysOnListener} |
| * |
| * @param executor an {@link Executor} to execute given listener |
| * @param listener user implementation of the {@link ControllerAlwaysOnListener} |
| */ |
| public void register(@NonNull Executor executor, |
| @NonNull ControllerAlwaysOnListener listener) { |
| try { |
| if (!mAdapter.isControllerAlwaysOnSupported()) { |
| return; |
| } |
| } catch (RemoteException e) { |
| Log.w(TAG, "Failed to register"); |
| return; |
| } |
| synchronized (this) { |
| if (mListenerMap.containsKey(listener)) { |
| return; |
| } |
| |
| mListenerMap.put(listener, executor); |
| if (!mIsRegistered) { |
| try { |
| mAdapter.registerControllerAlwaysOnListener(this); |
| mIsRegistered = true; |
| } catch (RemoteException e) { |
| Log.w(TAG, "Failed to register"); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Unregister the specified {@link ControllerAlwaysOnListener} |
| * |
| * @param listener user implementation of the {@link ControllerAlwaysOnListener} |
| */ |
| public void unregister(@NonNull ControllerAlwaysOnListener listener) { |
| try { |
| if (!mAdapter.isControllerAlwaysOnSupported()) { |
| return; |
| } |
| } catch (RemoteException e) { |
| Log.w(TAG, "Failed to unregister"); |
| return; |
| } |
| synchronized (this) { |
| if (!mListenerMap.containsKey(listener)) { |
| return; |
| } |
| |
| mListenerMap.remove(listener); |
| |
| if (mListenerMap.isEmpty() && mIsRegistered) { |
| try { |
| mAdapter.unregisterControllerAlwaysOnListener(this); |
| } catch (RemoteException e) { |
| Log.w(TAG, "Failed to unregister"); |
| } |
| mIsRegistered = false; |
| } |
| } |
| } |
| |
| private void sendCurrentState(@NonNull ControllerAlwaysOnListener listener) { |
| synchronized (this) { |
| Executor executor = mListenerMap.get(listener); |
| |
| final long identity = Binder.clearCallingIdentity(); |
| try { |
| executor.execute(() -> listener.onControllerAlwaysOnChanged( |
| mCurrentState)); |
| } finally { |
| Binder.restoreCallingIdentity(identity); |
| } |
| } |
| } |
| |
| @Override |
| public void onControllerAlwaysOnChanged(boolean isEnabled) { |
| synchronized (this) { |
| mCurrentState = isEnabled; |
| for (ControllerAlwaysOnListener cb : mListenerMap.keySet()) { |
| sendCurrentState(cb); |
| } |
| } |
| } |
| } |
| |