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      1 /*
      2  * Copyright (C) 2009 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 ANDROID_ANDROID_NATIVES_H
     18 #define ANDROID_ANDROID_NATIVES_H
     19 
     20 #include <sys/types.h>
     21 
     22 #include <nativebase/nativebase.h>
     23 
     24 
     25 /*****************************************************************************/
     26 
     27 #ifdef __cplusplus
     28 
     29 #include <utils/RefBase.h>
     30 
     31 namespace android {
     32 
     33 /*
     34  * This helper class turns a ANativeXXX object type into a C++
     35  * reference-counted object; with proper type conversions.
     36  */
     37 template <typename NATIVE_TYPE, typename TYPE, typename REF,
     38         typename NATIVE_BASE = android_native_base_t>
     39 class ANativeObjectBase : public NATIVE_TYPE, public REF
     40 {
     41 public:
     42     // Disambiguate between the incStrong in REF and NATIVE_TYPE
     43     void incStrong(const void* id) const {
     44         REF::incStrong(id);
     45     }
     46     void decStrong(const void* id) const {
     47         REF::decStrong(id);
     48     }
     49 
     50 protected:
     51     typedef ANativeObjectBase<NATIVE_TYPE, TYPE, REF, NATIVE_BASE> BASE;
     52     ANativeObjectBase() : NATIVE_TYPE(), REF() {
     53         NATIVE_TYPE::common.incRef = incRef;
     54         NATIVE_TYPE::common.decRef = decRef;
     55     }
     56     static inline TYPE* getSelf(NATIVE_TYPE* self) {
     57         return static_cast<TYPE*>(self);
     58     }
     59     static inline TYPE const* getSelf(NATIVE_TYPE const* self) {
     60         return static_cast<TYPE const *>(self);
     61     }
     62     static inline TYPE* getSelf(NATIVE_BASE* base) {
     63         return getSelf(reinterpret_cast<NATIVE_TYPE*>(base));
     64     }
     65     static inline TYPE const * getSelf(NATIVE_BASE const* base) {
     66         return getSelf(reinterpret_cast<NATIVE_TYPE const*>(base));
     67     }
     68     static void incRef(NATIVE_BASE* base) {
     69         ANativeObjectBase* self = getSelf(base);
     70         self->incStrong(self);
     71     }
     72     static void decRef(NATIVE_BASE* base) {
     73         ANativeObjectBase* self = getSelf(base);
     74         self->decStrong(self);
     75     }
     76 };
     77 
     78 } // namespace android
     79 #endif // __cplusplus
     80 
     81 /*****************************************************************************/
     82 
     83 #endif /* ANDROID_ANDROID_NATIVES_H */
     84