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/**
* Copyright (C) 2017 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_JAVA_REF_H
#define _ANDROID_JAVA_REF_H
#include <android-base/macros.h>
#include <functional>
#include <jni.h>
#include <memory>
#include <type_traits>
namespace android {
template <typename T>
using JavaRef = std::unique_ptr<typename std::remove_pointer<T>::type, std::function<void(T)>>;
template <typename T>
JavaRef<T> make_javaref(JNIEnv *env, T ref) {
return JavaRef<T>(ref, [env](T ref) {
if (env && ref) {
env->DeleteLocalRef(ref);
}
});
}
class EnvWrapper {
public:
EnvWrapper(JNIEnv *env);
template <typename T>
JavaRef<T> operator() (T ref) const {
return make_javaref(mEnv, ref);
}
private:
JNIEnv *mEnv;
DISALLOW_COPY_AND_ASSIGN(EnvWrapper);
};
} // namespace android
#endif // _ANDROID_JAVA_REF_H
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