1 /*
2 * Copyright 2016, 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 namespace android {
18
19 /* JNI Helpers for wifi_hal to WifiNative bridge implementation */
20
21 class JNIHelper;
22
23 template<typename T>
24 class JNIObject {
25 protected:
26 JNIHelper &mHelper;
27 T mObj;
28 public:
29 JNIObject(JNIHelper &helper, T obj);
30 JNIObject(const JNIObject<T>& rhs);
31 virtual ~JNIObject();
getHelper()32 JNIHelper& getHelper() const {
33 return mHelper;
34 }
get()35 T get() const {
36 return mObj;
37 }
T()38 operator T() const {
39 return mObj;
40 }
isNull()41 bool isNull() const {
42 return mObj == NULL;
43 }
44 void release();
detach()45 T detach() {
46 T tObj = mObj;
47 mObj = NULL;
48 return tObj;
49 }
50 T clone();
51 JNIObject<T>& operator = (const JNIObject<T>& rhs) {
52 release();
53 mHelper = rhs.mHelper;
54 mObj = rhs.mObj;
55 return *this;
56 }
print()57 void print() {
58 ALOGD("holding %p", mObj);
59 }
60
61 private:
62 template<typename T2>
63 JNIObject(const JNIObject<T2>& rhs); // NOLINT(implicit)
64 };
65
66 class JNIHelper {
67 JavaVM *mVM;
68 JNIEnv *mEnv;
69
70 public :
71 explicit JNIHelper(JavaVM *vm);
72 explicit JNIHelper(JNIEnv *env);
73 ~JNIHelper();
74
75 /* helpers to deal with static members */
76 JNIObject<jbyteArray> newByteArray(int num);
77 void setByteArrayRegion(jbyteArray array, int from, int to, const jbyte *bytes);
78
79 private:
80 /* Jni wrappers */
81 friend class JNIObject<jbyteArray>;
82 jobject newLocalRef(jobject obj);
83 void deleteLocalRef(jobject obj);
84 };
85
86 template<typename T>
JNIObject(JNIHelper & helper,T obj)87 JNIObject<T>::JNIObject(JNIHelper &helper, T obj)
88 : mHelper(helper), mObj(obj)
89 { }
90
91 template<typename T>
JNIObject(const JNIObject<T> & rhs)92 JNIObject<T>::JNIObject(const JNIObject<T>& rhs)
93 : mHelper(rhs.mHelper), mObj(NULL)
94 {
95 mObj = (T)mHelper.newLocalRef(rhs.mObj);
96 }
97
98 template<typename T>
~JNIObject()99 JNIObject<T>::~JNIObject() {
100 release();
101 }
102
103 template<typename T>
release()104 void JNIObject<T>::release()
105 {
106 if (mObj != NULL) {
107 mHelper.deleteLocalRef(mObj);
108 mObj = NULL;
109 }
110 }
111
112 template<typename T>
clone()113 T JNIObject<T>::clone()
114 {
115 return mHelper.newLocalRef(mObj);
116 }
117 }
118
119 #define THROW(env, message) (env).throwException(message, __LINE__)
120