AHandlerReflector.h revision 27c174483a8ae9688d5d4897c19074f62c7f1701 
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
23namespace android {
24
25template<class T>
26struct AHandlerReflector : public AHandler {
27    AHandlerReflector(T *target)
28        : mTarget(target) {
29    }
30
31protected:
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
39private:
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