Brian Carlstrom | 3d9d214 | 2013-05-10 14:09:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 SCOPED_LOCAL_REF_H_included |
| 18 | #define SCOPED_LOCAL_REF_H_included |
| 19 | |
| 20 | #include "jni.h" |
| 21 | |
| 22 | #include <stddef.h> |
| 23 | |
| 24 | // A smart pointer that deletes a JNI local reference when it goes out of scope. |
| 25 | template<typename T> |
| 26 | class ScopedLocalRef { |
| 27 | public: |
| 28 | ScopedLocalRef(JNIEnv* env, T localRef) : mEnv(env), mLocalRef(localRef) { |
| 29 | } |
| 30 | |
| 31 | ~ScopedLocalRef() { |
| 32 | reset(); |
| 33 | } |
| 34 | |
| 35 | void reset(T ptr = NULL) { |
| 36 | if (ptr != mLocalRef) { |
| 37 | if (mLocalRef != NULL) { |
| 38 | mEnv->DeleteLocalRef(mLocalRef); |
| 39 | } |
| 40 | mLocalRef = ptr; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | T release() __attribute__((warn_unused_result)) { |
| 45 | T localRef = mLocalRef; |
| 46 | mLocalRef = NULL; |
| 47 | return localRef; |
| 48 | } |
| 49 | |
| 50 | T get() const { |
| 51 | return mLocalRef; |
| 52 | } |
| 53 | |
| 54 | private: |
| 55 | JNIEnv* mEnv; |
| 56 | T mLocalRef; |
| 57 | |
| 58 | // Disallow copy and assignment. |
| 59 | ScopedLocalRef(const ScopedLocalRef&); |
| 60 | void operator=(const ScopedLocalRef&); |
| 61 | }; |
| 62 | |
| 63 | #endif // SCOPED_LOCAL_REF_H_included |