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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