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      1 /*
      2  * Copyright (C) 2010 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 #ifndef A_HANDLER_REFLECTOR_H_
     18 
     19 #define A_HANDLER_REFLECTOR_H_
     20 
     21 #include <media/stagefright/foundation/AHandler.h>
     22 
     23 namespace android {
     24 
     25 template<class T>
     26 struct AHandlerReflector : public AHandler {
     27     AHandlerReflector(T *target)
     28         : mTarget(target) {
     29     }
     30 
     31 protected:
     32     virtual void onMessageReceived(const sp<AMessage> &msg) {
     33         sp<T> target = mTarget.promote();
     34         if (target != NULL) {
     35             target->onMessageReceived(msg);
     36         }
     37     }
     38 
     39 private:
     40     wp<T> mTarget;
     41 
     42     AHandlerReflector(const AHandlerReflector<T> &);
     43     AHandlerReflector<T> &operator=(const AHandlerReflector<T> &);
     44 };
     45 
     46 }  // namespace android
     47 
     48 #endif  // A_HANDLER_REFLECTOR_H_
     49