1 /** 2 * Copyright (C) 2017 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_JAVA_REF_H 18 #define _ANDROID_JAVA_REF_H 19 20 #include <android-base/macros.h> 21 #include <functional> 22 #include <jni.h> 23 #include <memory> 24 #include <type_traits> 25 26 namespace android { 27 28 template <typename T> 29 using JavaRef = std::unique_ptr<typename std::remove_pointer<T>::type, std::function<void(T)>>; 30 31 template <typename T> 32 JavaRef<T> make_javaref(JNIEnv *env, T ref) { 33 return JavaRef<T>(ref, [env](T ref) { 34 if (env && ref) { 35 env->DeleteLocalRef(ref); 36 } 37 }); 38 } 39 40 JavaRef<jstring> make_javastr(JNIEnv *env, const std::string &str); 41 42 } // namespace android 43 44 #endif // _ANDROID_JAVA_REF_H 45
