1 /*
2  * Copyright (C) 2014 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 ART_RUNTIME_HANDLE_WRAPPER_H_
18 #define ART_RUNTIME_HANDLE_WRAPPER_H_
19 
20 #include "handle.h"
21 #include "obj_ptr.h"
22 
23 namespace art {
24 
25 // A wrapper which wraps around Object** and restores the pointer in the destructor.
26 // TODO: Delete
27 template<class T>
28 class HandleWrapper : public MutableHandle<T> {
29  public:
HandleWrapper(T ** obj,const MutableHandle<T> & handle)30   HandleWrapper(T** obj, const MutableHandle<T>& handle)
31      : MutableHandle<T>(handle), obj_(obj) {
32   }
33 
34   HandleWrapper(const HandleWrapper&) = default;
35 
~HandleWrapper()36   ~HandleWrapper() {
37     *obj_ = MutableHandle<T>::Get();
38   }
39 
40  private:
41   T** const obj_;
42 };
43 
44 
45 // A wrapper which wraps around ObjPtr<Object>* and restores the pointer in the destructor.
46 // TODO: Add more functionality.
47 template<class T>
48 class HandleWrapperObjPtr : public MutableHandle<T> {
49  public:
HandleWrapperObjPtr(ObjPtr<T> * obj,const MutableHandle<T> & handle)50   HandleWrapperObjPtr(ObjPtr<T>* obj, const MutableHandle<T>& handle)
51       : MutableHandle<T>(handle), obj_(obj) {}
52 
53   HandleWrapperObjPtr(const HandleWrapperObjPtr&) = default;
54 
~HandleWrapperObjPtr()55   ~HandleWrapperObjPtr() {
56     *obj_ = MutableHandle<T>::Get();
57   }
58 
59  private:
60   ObjPtr<T>* const obj_;
61 };
62 
63 }  // namespace art
64 
65 #endif  // ART_RUNTIME_HANDLE_WRAPPER_H_
66