1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.hardware.camera2.utils; 18 19 import android.os.DeadObjectException; 20 import android.os.RemoteException; 21 import android.util.Log; 22 23 import java.lang.reflect.Method; 24 25 /** 26 * Translate camera service status_t return values into exceptions. 27 * 28 * @see android.hardware.camera2.utils.CameraBinderDecorator#newInstance 29 * @hide 30 */ 31 public class CameraServiceBinderDecorator extends CameraBinderDecorator { 32 33 private static final String TAG = "CameraServiceBinderDecorator"; 34 35 static class CameraServiceBinderDecoratorListener 36 extends CameraBinderDecorator.CameraBinderDecoratorListener { 37 38 // Pass through remote exceptions, unlike CameraBinderDecorator 39 @Override onCatchException(Method m, Object[] args, Throwable t)40 public boolean onCatchException(Method m, Object[] args, Throwable t) { 41 42 if (t instanceof DeadObjectException) { 43 // Can sometimes happen (camera service died) 44 // Pass on silently 45 } else if (t instanceof RemoteException) { 46 // Some other kind of remote exception - this is not normal, so let's at least 47 // note it before moving on 48 Log.e(TAG, "Unexpected RemoteException from camera service call.", t); 49 } 50 // All other exceptions also get sent onward 51 return false; 52 } 53 54 } 55 56 /** 57 * <p> 58 * Wraps the type T with a proxy that will check 'status_t' return codes 59 * from the native side of the camera service, and throw Java exceptions 60 * automatically based on the code. 61 * </p> 62 * 63 * @param obj object that will serve as the target for all method calls 64 * @param <T> the type of the element you want to wrap. This must be an interface. 65 * @return a proxy that will intercept all invocations to obj 66 */ newInstance(T obj)67 public static <T> T newInstance(T obj) { 68 return Decorator.<T> newInstance(obj, new CameraServiceBinderDecoratorListener()); 69 } 70 } 71