libs/ui/include/ui/ANativeObjectBase.h

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_ANDROID_NATIVES_H
#define ANDROID_ANDROID_NATIVES_H

#include <sys/types.h>

#include <nativebase/nativebase.h>


/*****************************************************************************/

#ifdef __cplusplus

#include <utils/RefBase.h>

namespace android {

/*
 * This helper class turns a ANativeXXX object type into a C++
 * reference-counted object; with proper type conversions.
 */
template <typename NATIVE_TYPE, typename TYPE, typename REF,
        typename NATIVE_BASE = android_native_base_t>
class ANativeObjectBase : public NATIVE_TYPE, public REF
{
public:
    // Disambiguate between the incStrong in REF and NATIVE_TYPE
    void incStrong(const void* id) const {
        REF::incStrong(id);
    }
    void decStrong(const void* id) const {
        REF::decStrong(id);
    }

protected:
    typedef ANativeObjectBase<NATIVE_TYPE, TYPE, REF, NATIVE_BASE> BASE;
    ANativeObjectBase() : NATIVE_TYPE(), REF() {
        NATIVE_TYPE::common.incRef = incRef;
        NATIVE_TYPE::common.decRef = decRef;
    }
    static inline TYPE* getSelf(NATIVE_TYPE* self) {
        return static_cast<TYPE*>(self);
    }
    static inline TYPE const* getSelf(NATIVE_TYPE const* self) {
        return static_cast<TYPE const *>(self);
    }
    static inline TYPE* getSelf(NATIVE_BASE* base) {
        return getSelf(reinterpret_cast<NATIVE_TYPE*>(base));
    }
    static inline TYPE const * getSelf(NATIVE_BASE const* base) {
        return getSelf(reinterpret_cast<NATIVE_TYPE const*>(base));
    }
    static void incRef(NATIVE_BASE* base) {
        ANativeObjectBase* self = getSelf(base);
        self->incStrong(self);
    }
    static void decRef(NATIVE_BASE* base) {
        ANativeObjectBase* self = getSelf(base);
        self->decStrong(self);
    }
};

} // namespace android
#endif // __cplusplus

/*****************************************************************************/

#endif /* ANDROID_ANDROID_NATIVES_H */