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
31namespace android {
32
33/*
34 * This helper class turns a ANativeXXX object type into a C++
35 * reference-counted object; with proper type conversions.
36 */
37template <typename NATIVE_TYPE, typename TYPE, typename REF,
38        typename NATIVE_BASE = android_native_base_t>
39class ANativeObjectBase : public NATIVE_TYPE, public REF
40{
41public:
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
50protected:
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